US3551554A - Enhancing tissue penetration of physiologically active agents with dmso - Google Patents
Enhancing tissue penetration of physiologically active agents with dmso Download PDFInfo
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- US3551554A US3551554A US753231A US3551554DA US3551554A US 3551554 A US3551554 A US 3551554A US 753231 A US753231 A US 753231A US 3551554D A US3551554D A US 3551554DA US 3551554 A US3551554 A US 3551554A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/06—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite
- A61K47/20—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing sulfur, e.g. dimethyl sulfoxide [DMSO], docusate, sodium lauryl sulfate or aminosulfonic acids
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/0012—Galenical forms characterised by the site of application
- A61K9/0014—Skin, i.e. galenical aspects of topical compositions
Definitions
- compositions of DMSO at concentrations of 50% and above are employed and for penetration through mucous membranes, compositions including DMSO at concentrations of and above are employed.
- Antineoplastic agents, steroids, central nervous system-active agents, local anaesthetics, anti-inflammatory agents, diagnostic dyes and radiopaque agents, and vasodilators may be advantageously administered by injection with DMSO in concentrations preferably up to by weight to enhance penetration of internal tissue membrane barriers to achieve better distribution of these agents.
- Some agents are inactivated in the gastrointestinal tract or they are absorbed poorly into the body from the tract. Also, undersirable side eifects may result which prevent efltective oral administration.
- a local concentration for a local effect is often desired but a larger systemic dose must be given to achieve an effective concentration at the local area when the agent can only be injected or given orally, (but not topically). This higher dose often causes undesirable side eifects, since dosage related side effects are very prevalent for many agents.
- Dimethyl sulfoxide is a water-White liquid at room temperature having a freezing point of approximately 18.5 C. and a specific gravity of approximately 1.1.
- Dimethyl sulfoxide is a well known industrial solvent and it has been available in commercial quantities for at least a decade (from Crown Zellerbach Corporation, San Francisco, Calif.).
- DMSO was originally synthesized in 1866 and since that time it has been extensively investigated for possible industrial and biological utility and a con siderable amount of literature has developed on its properties and uses. Over the last 25 years it has found Widespread use as a solvent in industry and in the laboratory.
- DMSO has been investigated in the past for various biochemical uses, for example as a reaction solvent for preparing derivatives of various proteins, and antibiotics, as an extraction solvent for various proteins, as an analytical solvent and as a solvent for various other laboratory uses. It has also been suggested as a solvent for certain pesticides (see, for example, US. Pat. No. 3,068,- 142 D MSO has been investigated as a preservative agent for in vitro storage of chilled or frozen tissue and it has also been determined to have a protective effect in experimental animals subjected to X-irradiation following injection of DMSO into such animals.
- DMSO has been listed along with various inert materials as bland, high boiling fluids to be used as carriers for the griseofulvin in applying it to the skin to control fungus growth in the skin (see British Pat. No. 810,377).
- DMSO has been employed as a solvent for preparation of certain injectable formulations, namely chloramphenicol and an anthelminic preparation (see Pat. Nos. 3,044,936 and 3,067,096).
- DMSO when applied to animal tissue, increases the permeability of the tissue in a reversible manner to cause a much greater penetration rate for conjointly applied physiologically active agents.
- the mode of activity is still unclear, it is definitely not that of the simple vehicle or carrier since the effect may be obtained to some extent even when the DMSO is applied to the tissue separately and the enhanced penetrability of the tissue may last for as much as three hours after the DMSO treatment.
- an agent such as a steroid
- a steroid When applied to the intact skin along with dimethyl sulfoxide, particularly at a DMSO concentration of 50% by weight and above, or to skin pretreated with the dimethyl sulfoxide, an agent such as a steroid, may penetrate rapidly to and saturate the stratum corneum (the highly resistant horny layer of the skin which is the major barrier to penetration). The steroid continues to penetrate through the skin from this reservoir in the stratum corneum to the underlying tissue and into the circulatory system.
- stratum corneum the highly resistant horny layer of the skin which is the major barrier to penetration
- topical is intended to include application to all external membrane barriers including the cutaneous or epidermis regions and the mucous membranes including the gastrointestinal tract, the respiratory tract and the genitourinary tract.
- the intimate distribution of the agent in the tissue near the site of injection prolongs and enhances its physiologic activity at this local site. This may permit use of a lower dose to achieve the desired response with a smaller risk of side effects which may result from a higher dose.
- conjoint application of DMSO along with physiologically active agents having an activity site in the individual cells of the host may additionally result in an enhanced effect of the agent through the ability of DMSO to increase the permeability of such individual cells to such agents.
- DMSO acts by several mechanisms in enhancing penetration. DMSO is believed to act directly on tissue to alter the general permeability of the tissue membrane. More specifically, DMSO when applied thereto, is believed to decrease the natural resistance of tissue membranes to penetration by foreign agents. DMSO is also believed to promote penetration by a direct transport effect, perhaps by the mechanism of complexing with the agent. This mechanism is believed more applicable to cationic and anionic agents.
- This invention is applicable to the tissue or organisms of all animal phyla, DMSO having differing degrees of influence on penetration of various tissue types of a given animal.
- Animals of particular importance in the practice of the invention are the mammalians, especially man and veterinary animals.
- the invention may also be practiced with other vertebrates, as for example the amphibians, fishes, reptiles, etc. and with the lower species comprising the non-vertebrates.
- tissue penetrability is thus altered by such pretreatment and this reversible effect gradually diminishes and the tissue returns to its normal permeability state.
- Penetration enhancement is generally non-selective in terms of the type or physiological effect or effects of agents to be transported across membrane barriers.
- the extent of penetration enhancement will depend upon many factors, the predominant factors being the relative natural permeability of the particular membrane, the concentration of DMSO applied, the extent of solubility of the agent in DMSO and the chemical and physical properties of the agent.
- cationic agents means chemical compounds which dissociate into relatively small, mobile anion(s) and much less mobile cation(s) which are considerably larger than the anion(s) (e.g. having a radical weight ratio greater than 1 to 3, but more usually on the order of 1 to 10-100), appear to obtain the most pronounced penetration enhancement with DMSO. Even penetration of external membrane barriers such as the mucous membranes may be effected with these agents utilizing rather low amounts of DMSO, frequently as low as 10-20% by weight. Following Examples 34, 69, 73 and others illustrate cationic agents.
- Anionic agents meaning agents which dissociate into relatively small, mobile cation(s) and large, less mobile anion(s) which are considerably larger than the cation(s) (e.g. having a radical weight ratio greater than three to l but more usually on the order of l0-l00 to 1) also obtain marked penetration enhancement with DMSO.
- DMSO a radical weight ratio greater than three to l but more usually on the order of l0-l00 to 1
- lower concentrations of DMSO as for example 15% by weight (see following Example 34)
- higher concentrations of DMSO are frequently desirable for maximum effect, e.g. 50% by weight and above, particularly for epidermal application.
- DMSO non-dissociating chemical compounds
- concentrations of DMSO i.e. 0% and above, are frequently desirable for maximum effect, particularly for epidermal applications.
- Illustrative of this class of chemical agents are following Examples 1, 2, 3, 4, 47, .58, 72 and others.
- agents which form complexes with DMSO for example iodine and most metal halides and nitrates, are also beneficially enhanced. Such agents are illustrated by Examples 41, 42, 43 and 74.
- the size of the compound obviously may influence to some extent the relative ability of agents to penetrate tissue.
- effective membrane penetration utilizing DMSO has been demonstrated for extremely large compounds, for example compounds having molecular weights exceeding 40,000 (also see Examples 75 and 76 illustrating penetration enhancement of insulin which has a molecular weight of about 6,000). Even for such a daunting membrane barrier as intact human skin, quite large compounds have been demonstrated to be effectively enhanced.
- heparin which has a molecular Weight of 8,000 and above, can be effectively penetrated through the human epidermis in some cases.
- Standard occlusion techniques frequently may increase the percutaneous absorption of the larger molecules.
- at least a limited degree of solubility of the agent in DMSO is desirable to achieve maximum benefit of the present invention.
- the practitioner will select agents, routes of administration and composition forms guided by these Well-known principles.
- physiologically active in describing the agents contemplated herein is used in a broad sense to comprehend not only agents having a direct pharmacological effect on the host but also those having an indirect or observable effect which is useful in the medical arts, e.g. the coloring or opacifying of tissue for diagnostic purposes, the screening of UV. radiation from the tissues, etc.
- Agents, penetration of which across membrane barriers, particularly external membranes, may be beneficially enhanced upon direct application include: physiologically active steroids, antineoplastic agents, antigens, antiunicellular microorganism agent's, antihistaminic agents, neuropharrnacologic agents, anti-inflammatory agents, anticoagulants, vasodilators, ultra-violet screening agents, diagnostic dyes and radiopaque agents and nutrients.
- Agents the penetration of which across internal membranes may be particularly benefited upon injection include antineoplastic agents, steroids, central nervous system-active agents, local anaesthetics, anti-inflammatory agents, diagnostic dyes and radiopaque agents and vasodilators.
- the concentration of the DMSO applied to enhance penetration may vary over wide limits.
- the concentration selected is desirably related to the route of administration to be employed.
- compositions including at least about 50% by weight DMSO are preferable in that they have been found to increase percutaneous penetration in a highly significant manner. with DMSO concentrations closely approaching 100% Maximum cutaneous penetration is generally attained (excluding the agent), but with concentrations much above 90% by weight the incremental increase in penetration rate over that achieved at 90% often is relatively small.
- concentrations much above 90% by weight the incremental increase in penetration rate over that achieved at 90% often is relatively small.
- above a 90% concentration of dimethyl sulfoxide the side effects of a burning sensation and erythema increase significantly. Accordingly, for topical use, it may be desirable, consistent with physical stability of the composition, to formulate the DMSO in compositions containing a DMSO concentration of between about 50% and by weight and containing water, preferably 10% by weight or greater.
- DMSO dimethyl methacrylate
- DMSO dimethyl methoxysulfoxide
- concentrations say 3040%
- the amount of the physiologically active agent to be administered will obviously be an effective amount for the desired result expected therefrom. This, of course, will be ascertained by the ordinary skill of the practitioner. Due to enhanced activity which may be achieved through better penetration, the dosage of agent may often be decreased from that generally applicable. In accordance with the usual prudent formulating practices, a dosage near the lower end of the useful range of the particular agent may be employed initially and the dosage increased as indicated from the observed response, as in the routine :procedure of the physician.
- the DMSO may advantageously be compounded with the physiologically active agent for concurrent administration.
- the usual pharmaceutical compounding agents, diluents or carriers may be included in these compositions as desirable for theparticular route of administration and dosage form.
- the amount and type of diluent or carrier used should, of course, be consistent with the compatability of the agent in DMSO and the diluent.
- a cosolvent or other standard adjuvant, such as a surfactant, may be called for to maintain the agent in solution or suspension at the desired concentration. Where stability of the agent in the presence of DMSO at the desired concentration is a problem, it may be desirable to prepare the formulation immediately before administration or to administer the DMSO and the agent separately to the tissue.
- route of administration for a given agent, obviously the known toxicity, side effects and effectiveness for a given route of administration should be taken into account. For example due to skin irritation known to be caused by some agents or due to poor penetration characteristics, some other route than dermal application may be the route or choice for such agents.
- Dosage forms for topical application may include solutions (paints), nasal sprays, lotions, ointments (including creams and gels), suppositories and the like.
- the solutions and nasal sprays may simply comprise the agent dissolved in DMSO, optionally with an amount of water, glycerine or other diluent.
- DMSO may be present in these forms in various concentrations, say from about 10% to about 75% by weight or higher.
- Lotions and gels, ointmeuts or creams may contain the usual ingredients to provide a base, as for example cetyl alcohol, an emulsifier such as lauryl sulfate and water.
- a base may be formulated by combining equal weight amounts of stearic acid, cetyl alcohol, triethanolamine and glycerol monostearate with water.
- Still other bases may utilize polyethylene glycols of different vis cosities, depending upon the desired consistency.
- DMSO may be added to the lotion or ointment base in varying amounts as desired, generally up to around 50% by weight.
- a suppository form may be made from a high viscosity polyethylene glycol 4,000, water and DMSO, which may be present in an amount of about 20% by weight.
- the concentration of physiologically active agent in the various dosage forms is, of course, commensurate with that normally utilized for the particular agent in conventional formulations for effective results for the intended route. Both the amount of physiologically active agent and the amount of DMSO will be influenced by the type of eflect desired. If a more localized effect is required, as for example, in treating a superficial infection with an antibacterial agent, lower amounts of physiologically active agents and lower concentrations of DMSO may be called for. Where deeper penetration is desired, as in the case of local anaesthesia, a higher concentration of DMSO may be desirable to promote adequate penetration. Where general systemic concentration of an agent is desired for a topical preparation, generally higher concentrations of DMSO are desirable and the amount of agent as, for example, a steroid, may be included in the composition sufficient to provide the blood level desired.
- the various pharmaceutical forms are desirably provided in determined amounts, as in containers of a given volume. These amounts may include 100% DMSO concentration containing the desired dose of the agent, or a lesser concentration of DMSO with a diluent and the physiologically active agent dose. Thus, for example, graduated ampules containing, say cc. of 100% DMSO with the agent dissolved therein may be provided. The practitioner need only open and dispense all or a determined part to a subject. Nasal spray bottles, aspirators, suppositories, cotton tipped stick applicators, squeeze tubes may all be utilized for topical application.
- EXAMPLE 1 Penetration of solutes and ions through skin of frogs
- the skin of the frog Rana pipiens is often used as a model membrane system.
- the skin is removed and placed as a wall barrier between two glass chambers which are filled with dilute sodium chloride salt solution.
- the chambers are constructed to permit electrical measurements and addition or sampling of fluid from either side.
- the fluid in the one chamber bathes the outside of the skin and the fluid in the other chamber bathes the inside of the skin.
- the movement is termed an outflux.
- a material that would make a membrane more permeable to any substance is said to increase a flux.
- Radioactive ions and radioactive labelled compounds were placed in the inside compartment and allowed to cross. The movement was quantitized by making serial radioassay of the bathing fluids. The outflux rate of a given substance was determined during several control periods. Dimethyl sulfoxide was then added to a 2.5% concentration and flux measurements were made for several successive periods. The following table presents sample data In a number of similar tests the range of multiple flux increase for these ions and molecules was about 5 to 10.
- STEROIDS Steroids are generally classed as organic molecules which have in common a perhydrocyclopentanophenanthrene nucleus and they are so named because they are related to and usually derived from sterols found abundantly in nature in animal and plant fats. Certain steroids are naturally produced in the body and they act as hormones to mediate and control many body functions. These hormones have been isolated or produced synthetically and used in replacement therapy for hormone deficiencies. Additionally and importantly, these steroids have been found to be highly useful drugs in the treat ment of a wide range of disease states not primarily due to lack of hormones.
- steroids and steroid drugs are intended to comprehend both the natural steroids and the biologically active modifications, derivatives and equivalents.
- Steroid drugs may have one or more of many types of biological activity such as anabolic, androgenic, glucocortoicoid, mineralocorticoid, estrogenic, progestogenic, lipoidiatic (removal of stored fat), circulatory system activity, central nervous system activity, anti-cancer and anti-osteoporic. Some steroid drugs have the ability to block the activity of other hormones, including the activity of other steroids. Their biological activity may be characterized as antiandrogenic, antiglucocorticoid, antimineralocorticoid (diuretic), antiestrogenic and antiprogestogenic. The various activities will be considered hereinafter in connection with specific embodiment of this invention.
- DMSO may be combined with glucorcorticoids to enhance their penetration to the affected tissue for these various disorders.
- glucorcorticoids may be combined with glucorcorticoids to enhance their penetration to the affected tissue for these various disorders.
- the following examples illustrate compositions and treatments for this purpose utilizing the most prominent and active natural and modified glucocorticoids:
- EXAMPLE 2 Penetration of injected corticosteroids A thirty-two year old white woman was seen with a two days history of left subdeltoid bursitis. This gave her pain on minimal abduction particularly, but also was present in other movements of the shoulder joints. Physical examination revealed marked tenderness to pressure with obvious protective muscle spasm overlying the joint. Two ml. of hydrocortisone was injected into the bursal area. This was associated with three hours relief of pain. The patient was seen again two days later. At this exam- 9 ination, her pain was just as marked as the first visit. Two ml. of hydrocortisone was injected and cc. of 100% dimethyl sulfoxide was applied liberally to the entire left shoulder area. Within minutes all pain disappeared and the patient reported no return of her symptoms when examined one week later.
- EXAMPLE 3 Penetration of injected corticosteroids A forty-two year old white male was examined with a one week history of acute subdeltoid bursitis of the right shoulder. Four mg. of Decadron was injectedinto the right subdeltoid bursa. The patient estimated that about a relief of his discomfort was attained. Full pain returned one day later. At this point, he was reinjected with 4 mg. of Decadron and 4 cc. of 100% dimethyl sulfoxide was placed on the skin over the involved bursa. This time the pain dissappeared completely and did not recur.
- EXAMPLE 4 Penetration of corticosteroids A twenty-four year old medical student was seen with atopic dermatitis of the right antecubital fossa. Three cc. of 100% dimethyl sulfoxide were applied four times daily for three days. No benefit was noted. One mg. or A cc. of Decadron (dexamethasone ZI-phosphate) was applied four times a day for two days without benefit. One mg. of dexamethasone 2l-phosphate in 3 cc. of 100% dimethyl sulfoxide was painted onto the involved area four times daily for three days. At the end of this period all evidence of the inflammatory reaction had disappeared.
- This example shows an improved action of dexamethasone 21-phosphate when used with dimethyl sulfoxide.
- EXAMPLE 5 The following lotion formulation may be prepared containing about 0.01 to 1.0%, with preferably 0.1% fluocinolone acetonide:
- the steroid is dissolved in the DMSO and added to a stirred, cooling melt of the other ingredients.
- the preparation is particularly useful for the treatment of inflammed dermatoses by topical application to the affected skin area.
- the amount and frequency of application is in accordance with standard practice for topical application of this steroid. Penetration of the steroid into the inflammed tissue is enhanced and a therapeutic level is achieved more rapidly than when the steroid is applied in conventional formulations.
- EXAMPLE 6 The following ointment (gel) formulation may be prepared containing about 0.2% to 1.0%, and preferably 0.6% triamcinilone acetonide:
- Triamcinilone acetonide 0.2-10
- Polyethylene glycol 400 400 Dimethyl sulfoxide 59
- Carboxy vinyl polymer powder '1 Triethanolamine 0.4
- the corticosteroid is dissolved in a mixture of the first two ingredients, and the carboxy vinyl polymer gelling agent is sprinkled on the surface of the combined liquids and stirred until all the particles have been wetted and dispersed.
- the triethanolamine is then added dropwise to the mixture until it has gelled, care being taken to minimize the air entrapment.
- This gel is particularly effective in the treatment of seborrhea and other scalp and hair inflammatory conditions and may be applied in amount and frequency conventionally used for topical application of this steroid. Better penetration and thereby an increased anti-inflammatory active is obtained for the amount of steroid applied than results from its application in conventional formulations.
- EXAMPLE 7 The following ointment formulation may be prepared containing about 0.1% to 1.0% prednisone and preferably 0.5%:
- the product is prepared as described in Example 5.
- the ointment is a valuable base for application of the corticosteroid to inflammatory dermatological areas, particularly when they require inunction. Application is in accordance with that usual for topical application of this steroid in conventional bases.
- EXAMPLE 8 The following cream formulations may be prepared containing about 0.1% to 1% 16a-methyl prednisolone and preferably 0.5%:
- Gm. l6a-methyl prednisolone 0.1-10 Stearic acid 200 Glyceryl monostearate, acid type 200 .
- Example 5 the product is prepared as directed in Example 5 and is useful in severe dermatoses requiring inunction.
- the following ointment formulation may be prepared containing about 0.5% to 2.5%, preferably 1.0%, de-
- the product is prepared as specified in Example 5.
- the product may be employed in treatment of pigmentation in Addisons disease by topical application to the affected area. Penetration may be increased sufficiently so that effective results may be obtained. In conventional bases this steroid has had very limited effectiveness topically and injection usually must be resorted to.
- Androgens Androgen is the generic term which comprehends tetrosterone, the natural male hormone, androsterone and the modifications and derivatives thereof which have masculinizing activity. Natural and modified androgens are employed in replacement therapy for hypogonadal males. Typical for this purpose are the isobutyrate, decanoate, isocaproate, enathate, phenylproprionate and cyclopentylproprionate esters of testosterone and 1'7-methyl testosterone.
- steroids which have been modified to decrease their unwanted virilizing effects (while retaining their anabolic and antiestrogenic activity) are generally preferred.
- the following steroids exemplify these compounds with the commercial source of the compounds indicated:
- a suppository formulation may be prepared as follows containing about 1 to 5%, preferably 2%, testosterone propionate:
- a suppository formulation may be prepared as follows containing about 1 %to 5%, preferably 2%, 17-methyl tetrosterone:
- a cream formulation may be prepared as follows containing about 1% to 10% preferably 3%, 17a-ethyl-19- nortestosterone:
- a lotion or paint formulation may be prepared as follows containing about 1% to 5 preferably 2%, testosterone propionate:
- the steroid is dissolved in a mixture of the dimethyl sulfoxide and water.
- the formulation may be applied topically as an anabolic and in the treatment of breast cancer.
- the enhancement of penetration over that obtained with conventional topical formulations permits more effective topical use of this steroid which previously had to be injected to achieve a response in many cases.
- EXAMPLE 14 The following cream may be formulated with the following composition containing about 1% to 10%, and preferably 3%, Za-methyl-dihydrotestosterone propionate (metholone) Metholone gm 10-100 Stearyl acid gm 200 Glycerol monostearate, acid type gm 200 Sodium lauryl sulfate cc 20 Water cc 400 Dimethyl sulfoxide cc 200
- the cream is prepared as directed in Example 5.
- the product is useful in the treatment of muscle wasting and weakness followed breast cancer surgery and may be applied topically to the affected area. Penetration of the steroid is greatly improved over that obtained in conventional formulations.
- EXAMPLE 15 The following ointment (gel) may be formulated containing about 1% to 5%, preferably 2%, steroid:
- the product is prepared as specified in Example 6.
- the product is useful in topical anabolic treatment, particularly in preventing thinning of the skin and in inducing blood vesel thickening.
- Estrogens and progestins Estrogen is the generic name for estradiol and its active metabolites estrone and estriol, naturally occurring female sex hormones, and their derivatives and modifications. Estrogens are useful in treating menstruation disorders, infertility, habitual abortions, and endometriosis. Along with progestrogens, they are used to control the reproductive cycle in women for contraception. They are also used in replacement therapy, particularly in treating the hormone deficiency states such as in postmenopausal women. Modified estrogens having lower feminizing characteristics are particularly useful for other applications including the treatment of atherosclerosis and osteoporosis. Their antiandrogenic effects are also useful in the treatment of prostatic cancer.
- Progesterone is a natural female hormone which plays a primary role in the reproductive cycle of the female mammal, particularly in the menstrual cycle of the primate. Progesterone and its modifications and derivatives are classified as progestins. Progestins are useful in replacement therapy and in treatment of menstrual disorders and prevention of fetal loss. A number of modified progestogens are useful in contraception. The various modified progestogens include the l9-norprogestogens, the 17a-methyl progestogen derivatives, the 3-enol ethers of progesterone, and 17-acet0xyprogesterone and the 9- iso-lO-iso compounds called retroprogesterones.
- This product is prepared as noted in Example 5.
- the product is designed as a means of establishing systemic replacement therapy for estrogens during menopause by simple topical application to the skin or mucous membrane.
- the DMSO enhances penetration of the estrogen sufficiently to obtain a systemic effect. This has not been possible in conventional formulations.
- a suppository may be formulated as follows to contain 0.1 to 1.0%, preferably 0.5%, of 3-methyl ether of etheynylestradiol:
- the product is used in estrogenic replacement therapy and may be used by rectal or vaginal application.
- EXAMPLE 18 Thefollowing ointment (gel) may be formulated containing 0.1% diethylstilbesterol:
- This gel is prepared as detailed in Example 6.
- the preparation is particularly suitable for topical application in the treatment of adolescent acne.
- a cream may be formulated as follows to contain about 0.72% norethynodrel and about 0.0286% mestranol:
- This cream is prepared as noted in Example 5. This formulation is to be used as a contraceptive agent applied cutaneously twice monthly at a dosage of 10 grams.
- a suppository formulation may be prepared as follows:
- Example 11 Chlormadinone mg 5 Stilbesterol mg 1 Polyethylene glycol 4000 gm 400 Propylene glycol monostearate gm 100 Dimethyl sulfoxide cc 500 The suppositories are formed as in Example 11. The product may be employed for treatment of irregular or prolonged bleeding.
- a certain steroid series, the 17-spirolactosteroids or spirolactones possesses an antialdosterone activity capable of blocking the effects of aldosterone on the kidney. Hence, they are called aldosterone antagonists.
- aldosterone antagonists The following example describes use of the spirolactones:
- EXAMPLE 21 The following ophthalmic formulation may be prepared containing about 0.1% to 0.75%, preferably 0.3%, spironolactone:
- the formulation is prepared by melting the polyethylene glycol 4000, dissolving the steroid in the DMSO, mixing the two liquids together and diluting to volume with water while stirring.
- the preparation is applied topically to the eye by eye dropper, or similar applicator, for treatment of glaucoma.
- Antineoplastic agents are drugs that combat cancerous processes. Antineoplastic agents at their present stage of development are generally only palliative, for in some instances only a temporary alleviation of subjective symptoms is obtained while the malignant process itself advances steadily. Nevertheless, these drugs play an important role in the treatment of malignancies to induce remissions.
- the antitumor agent in order to reduce and perhaps eliminate neoplastic cells, the antitumor agent must reach these cells in sufficient concentration. This may be hindered or prevented by certain pharmacological barriers or membranes. For example, in the case of leukemia, the blood-brain barrier, is an important obstacle to effective treatment with many agents.
- the effectiveness of antineoplastic agents is also ultimately limited because strains of neoplastic cells eventually develop which are resistant to their action. The survival of these cells is believed, in at least some instances, to be the result of their natural resistance to the entry of the antineoplastic agent. The proliferation of these resistant cells eventually causes the destruction of the host.
- DMSO has the ability by some mechanism not yet understood, to overcome the natural resistance of at least some malignant cells to penetration, thereby enhancing penetration of antineoplastic agents into such cells to destroy them.
- Penetration into underlying tissues and into the circulatory system may be obtained from topical application to the skin and mucous membranes. This is particularly useful for treatment of superficially located tumors. Also, in treatment of localized tumors by the injection routes, improved localized distribution of the antineoplastic agent in the tissue near the site of injection by the use of DMSO may prolong and enhance its physiologic activity at this local site. This may permit using a lower dose of agent to achieve the desired response with a smaller risk of side effect which may result from a higher dose.
- the same phenomenon may be of benefit for better penetration of affected tissue in oral administration, in regional therapy by intravenous and intraarterial infusion and injection of antineoplastic agents and in perfusion techniques, such as those following surgical excision of tumors.
- this enhancement of penetration increases the ability of the antineoplastic agents to cross membrane barriers which impede their effectiveness to come in contact with malignant cells in an effective concentration and to penetrate malignant cells naturally resistant to penetration.
- antineoplastic agents when the classification non-estrogenic anti-neoplastic agents is utilized, it is intended to mean all of the classes of antineoplastic agents, whether hormonal or nonhormonal, except for estrogenic anti-neoplastic agents, as for example esterone.
- Alkylating agents are highly reactive cyclic or unsaturated organic compounds having a denaturing or inactivating action on the malignant cell nucleus. A serious side effect of this group of agents istheir tendency to damage normal cells of the body. This causes a depression of the blood-forming action of the bone marrow and injury to the gastrointestinal mucosa. This limits the type and routes of administration of these agents. Many are even too toxic to permit oral administration and hence regional treatment of the affected site is desirable where it can be done effectively.
- alkylating agents are the nitrogen mustards, the ethylenimines and the alkyl sulfonates.
- the more prominent agents include mechlorethamine, phenylalanine mustard, tri'ethylene melamine (TEM), TEPA, thio-TEPA (tris(l-aziridinyl) phosphine sulfide), chlorambucil, busulfan, CRI3, (a phosphinic amide mustard) cyclophosphamide and mannitol mustard.
- TEM tri'ethylene melamine
- TEPA tri'ethylene melamine
- thio-TEPA tris(l-aziridinyl) phosphine sulfide
- chlorambucil busulfan
- CRI3 a phosphinic amide mustard
- a lotion formulation may be prepared containing approximately 10% cyclophosphamide and DMSO by blending the following:
- Antimetabolites are generally analogues of naturally occurring substances in the body necessary to cell metabolism. These agents destroy cancer cells by interfering with their metabolism. Since antimetabolites tend also to affect metabolism of rapidly multiplying normal cells,
- folic acid antagonists such as amethopterin (methotrexate)
- purine analogues such as 6-mercaptopurine, azathioprine, 6-thioguanine and 8-azaguanine
- pyrimidine analogues such as the uracils (principally the 5- halogen uracils, and -azauracil), azauridine and the 5- halogen deoxyuridines.
- Methotrexate is a known folic acid antagonist used to treat malignancy. Solutions containing this agent were prepared as follows:
- Methotrexate mg 5 Isotonic saline cc 50 Evans blue dye mg Trisodium phosphate M .05 Phosphoric acid M 0.3
- Methotrexate mg 5 Isotonic saline ml 42.5 Evans blue dye mg 100 Trisodium phosphate M .05 Phosphoric acid M .03 Dimethyl sulfoxide ml 7.5
- This formulation may also be utilized for direct infusion into the arterial blood supply for localized neoplasms or for direct injection into accessible localized neoplasms.
- a 5-fluorouracil formulation may be prepared by blending the following:
- the formulation is particularly useful in topical treatment of skin tumors or other localized superficial tumors.
- a typical dose is 5 grams. It is also useful in treating viral disorders such as warts.
- Vinca alkaloids A more recent class of antineoplastic agents are the alkaloids extracted from the shrub Vinca rosea and their derivatives. The more prominent of these are vinblastine, vinleurosine, vinrosidine and vincristine. The mechanism of action of the vinca alkaloids is still not known but they have activity against a wide variety of neoplasms.
- This example illustrates the specific use of DMSO, administered separately, to enhance penetration of the antineoplastic agent from the general circulation into the neoplastic tissue.
- corticosteroids as for example cortisone, hydrocortisone, dexamethasone and prednisone are used in cases of lymphosarcoma, Hodgkins disease, acute leukemia and mammary cancer metastases to obtain at least temporary remissions.
- a suppository formulation may be prepared by metling together the following:
- antigens As a means of diagnosis of antigen sensitivity and as a prophylactic or desensitizing treatment to build up an antibody defense against the invasion of antigens, such antigens, in specially prepared forms, are administered to susceptible subjects.
- various suspected antigens to which the subject may be allergic are applied intradermally or topically to the scratched skin of the subject. Allergy to a particular antigen is detected from the characteristic wheal and flare response.
- desensitization may be achieved by injection of an extract of the causative antigen in a series of gradually increasing doses.
- antigens generally must be administered by injection, because, in conventional formulations, they are usually not effectively absorbed through the intact or even abraded skin or mucous membrane. The discomfort, risk of injury and infection and cumbersome procedures involved in such routes of administration are readily apparent.
- Antigens may be administered topically with DMSO to the skin or mucous membrane to avoid the disadvantages inherent in subdermal application. Additionally, the DMSO, when combined with the antigen frequently has a denaturing effect upon the antigen to decrease its toxicity to a more acceptable level. This may permit the avoidance of some of the usual extensive procedure required to treat the antigen to detoxify or attenuate it. Where cutaneous application of antigens of a higher molecular weight is desired, they are preferably applied by occlu sion techniques and desirably they are applied to the more easily penetrated areas such as the axillary region. However, better results may be obtained with larger proteins and protein-polysaccharides by application to mucous membranes.
- allergens cause an adverse reaction of the tissues of certain subjects, on exposure thereto (mediated by specific antibody formation), which antigens, in similar amounts, are innocuous to other persons.
- the condition of sensitivity to such antigens is termed allergy and, accordingly, such antigens are also termed allergens.
- allergens are also termed allergens.
- the chief manifestations of the allergic reaction to allergens are hay fever, asthma, gastrointestinal disturbance, urticaria, angioneurotic edema and serum sickness.
- allergens there are a wide variety of allergens and their mode of contact is varied. These include such material as vegetable and animal epithelial emanations, various pollens, such as tree pollens, grass pollen, pollen from the rag weed family, and fungus spores, such as wheat and corn rust and wheat smuts.
- a series of suspected allergens are screened by contacting the tissue of the subject manifesting allergy symptoms with small amounts of the suspected allergens. The patient is then observed for a wheal and flare response at the site of administration. A positive response is indicative of allergy to the tested allergen.
- An extract of the confirmed allergen is conventionally prepared by solvent extraction from extraneous matter with which it may be associated. The extracted antigen is then detoxified through attenuation by heat and/or dilution with the solvent. The denatured allergen is then administered to the subject in a series of increasing doses to desensitize the patient.
- DMSO is utilized to enhance penetration of these conventional attenuated extracts.
- compositions and treatments both diagnostic and desensitizing (hyposensi- H tizing), utilizing a variety of allergens:
- EXAMPLE 28 A twenty-four year old male subject had a four year history of recurrent hay fever supposedly based on an allergy to tree pollenantigens. He was topically administered an allergenic extract of tree pollen on the upper area of the left forearm. An inch below this area, the extracted allergen in one cc. of 100% dimethyl sulfoxide was placed. Below this area was placed one cc. of 100% dimethyl sulfoxide. After on hour only the composition containing allergenic extract and dimethyl sulfoxide showed a positive reading. The reading was evaluated as a marked positive reaction.
- This same subject was later administered increasing doses of diluted tree pollen extract starting with an initial dose of 0.1 cc. placed into one cc. of 100% dimethyl sulfoxide every seven days.
- the tree pollen allergenic dose was increased but was always given with one cc. of 100% dimethyl sulfoxide.
- the composition was applied directly onto the skin without resorting to injection by the usual intracutaneous and subcutaneous route.
- the allergent passed through the skin without a needle as shown by a characteristic reaction which occurred about three hours after each application. There was a marked diminution in the subjects symptomatology after three months of treatment.
- Infective antigens In a wide 'variety of infective diseases, prophylactic treatment through immunization may be effective.
- an infective microorganism is administered to the subject to be immunized in order to stimulate the production of specific antibodies in the subject as a defense against subsequent invasion of the infective microorganisms.
- Some infective antigens such as cowpox, utilized as an antigen for smallpox, produce a low grade infection which produces antibodies specific against a more virulent microorganism, e.g. smallpox.
- the vaccine or toxoid thus produced is conventionally Immunizing formulations utilizing DMSO for enhancing penetration may be prepared utilizing the following:
- formulations may be applied topically to the mucous membranes, for example they may be applied as nose drops to the nasal passages.
- Application cutaneously by air jet injector may also be advantageous.
- An influenza virus vaccine may be prepared by combining the following formaldehyde-inactivated virus strains in a mixture of 7 ml. DMSO, 1 ml. glycerine and 2 ml. water:
- Taiwan 1/64 A 1000 Japan 170/62 (A 1000 PP 8 (A) 1000 Ann Arbor 1/57 (A 1000 Maryland 1/59 (B) 2000
- An adult dose of l-2 ml. of this formulation may be administered twice at a six week interval, either cutaneously with an air jet injector or intranasally as nose drops.
- EXAMPLE 32 A combination of types 1, 2 and 3 killed poliomyelitis virus strains in a concentration sufficient for one immunizing dose is prepared in 1 ml. of:
- DMSO Ethanol 10 Water 10 and lplrlotected by addition of 50 mcg. of neomycin base per This formulation provides an adult dose which may be applied intranasally as nose drops or as a spray. Cutaneous application by air jet injector may also be desired. Serial doses are given in accordance with standard procedure.
- Anti-unicellular microorganism agents DMSO is useful in enhancing the penetration and effectiveness of antimicrobial agents having growth-inhibiting properties relative to unicellular microorganisms, i.e., anti-unicellular microorganism agents.
- growth-inhibiting properties it is intended to mean the exhibition of biocidal or biostatic effects toward unicellular microorganisms.
- the phrase unicellular microorganism is intended to include those microorganisms commonly designated by microbiologists as consisting of single cells, such as bacteria, viruses, rickettsiae, yeasts and protoza, as opposed to multicellular microorganisms such as most fungi DMSO provides enhanced penetration of the antimicrobial agent to the locus of the unicellular microorganism.
- DMSO may additionally provide a lowering of the resistance of the microorganisms to the anti-unicellular microorganism agent, perhaps through action upon the cell wall of the microorganism.
- tuberculosis caused by the tubercle bacillus Mycobacterium tuberculosis is commonly effected with such drugs as amino salicyclic acid derivatives, isoniazid, viomycin, dapsone, and pyrazinamide.
- drugs as amino salicyclic acid derivatives, isoniazid, viomycin, dapsone, and pyrazinamide.
- DMSO dimethyl methoxysulfoxide
- DMSO may be effective in enhancing the penetration of these drugs to the situs of the tubercle bacillus. Additionally, it may render the bacillus more susceptible to the action of the anti-tuberculosis drug.
- EXAMPLE 33 The following lotion may be formulated, containing about 13% by weight isoniazid:
- Dimethyl sulfoxide 80 Ethanol Water 10 Isoniazid Urinary tract infections are caused by a variety of bacterial organisms, and these may be treated with synthetic chemotherapeutic agents such as hexamethylene tetramine, orthophenyl phenol and sulfonarnides, and broad spectrum antibiotics such as the tetracyclines and penicillin.
- synthetic chemotherapeutic agents such as hexamethylene tetramine, orthophenyl phenol and sulfonarnides, and broad spectrum antibiotics such as the tetracyclines and penicillin.
- the treatment of such infections with a combination of the usual chemotherapeutic agent plus DMSO may potentiate the action of the chemotherapeutic agent upon the bacteria causing the infection by rendering the microorganisms less resistant to the action of the agent in addition to enhancing the penetration of the agent to the situs of the microorganism as in the case of a urinary tract wash.
- EXAMPLE 34 Five female dogs Weighing between 11 and 13 kgs. were anaesthetized with sodium pentobarbital. Each animal was cathetized, its bladder emptied and the test solution instilled through the catheter. The various test solutions were made from the following basic solutions. The gram percent and milligram percent figures relate to the number of such weight units per 100 cc. of a final liquid volume.
- a sodium phosphate buffer system was added which was made from 0.05 M tribasic sodium phosphate, 0.33 M phosphoric .acid, and 0.67 sodium chloride, to make a total of 75 cc. with a pH of 9.
- Aminophyllin in 10 gmc./ kg. of body weight was inserted into the urinary bladders of the remaining dogs. In one of these 15 dimethyl sulfoxide was added and in the other 15% normal saline. The sodium phosphate buffer was used to bring the volume of both the dimethyl sulfoxide and saline solutions to 75 cc. with a pH of 9.
- clotting time appeared significantly increased in the dimethyl sulfoxide animals as compared to the saline control animals.
- EXAMPLE 35 The following irrigation solution may be formulated containing about 5% by weight of hexamethylene tetramine:
- EXAMPLE 36 The following antiseptic jelly may be formulated:
- Morning and evening cutaneous application of the foregoing solution may be made directly to skin lesions.
- Penicillin is the drug of first choice in infections caused by pneumococcus, streptococcus, gonococcus, susceptible strains of Staphylococci, Treponema, Clostridia, B. anthracis and Proteus mirabilis. It is potentially the drug of choice with a secondary indication for use against infections by Bacteroides, Actinomyces, and Salmonella.
- DMSO DMSO with penicillin is illustrated in the following example:
- EXAMPLE 38 A 20-year old male with bilaterally-infected ingrown toenails was treated with 90% dimethyl sulfoxide applied topically to the right great toe and 90% dimethyl sulfoxide plus cc. of aqueous penicillin (i.e, penicillin G), containing 1 million units applied to the left great toe. After two days, there was no inflammation or infection in the toe treated with the dimethyl sulfoxide and penicillin composition, whereas the toe treated with dimethyl sulfoxide alone had a minimal subsidence of infection. The penicillin in the composition was therefore carried across the skin barrier so that it contacted the infected infection site. These results show that dimethyl sulfoxide enhanced penetration of the antibiotic.
- penicillin G i.e, penicillin G
- streptomycin group of antibiotics which includes streptomycin, neomycin, kanamycin, paramomycin, and viomycin are bactericidal for a wide variety of bacteria, including the tubercle bacillus, but must be used with care in view of their renal and central nervous system toxicity. This group of drugs is effective against many penicillin-resistant organisms.
- the tetracyclines are the drugs of first choice in infections by Shigella, Brucella, Bacteroides, Eaton agent, and the Psittacosis- LGV-Trachoma viruses, They are possible drugs of choice (secondarily indicated) in Klebsiella infections, hospitalborne coliform infections, and respiratory tract infections.
- DMSO may additionally act to increase the sensitivity of previously resistant strains of microorganisms to antibiotics.
- EXAMPLE 39 A 36-year old female with an axillary abcess was attended surgically. The abcess was incised and cultured. The findings were: Staphylococcus, coagulase positive, resistant to penicillin, tetracycline and erythromycin, but sensitive to chloromycetin. An application of 50% aqueous dimethyl sulfoxide was made directly into the abcess three times daily. At the end of 48 hours and abcess was recultured and showed staphylococcus, coagulase positive, sensitive to penicillin, tetracycline, erythromycin and chloromycetin. It may be suggested that dimethyl sulfoxide alters sensitivity of the bacteria to antibiotics, perhaps by allowing an increased penetration of the antibiotic into the bacterium.
- EXAMPLE 40 A 60-year old male subject, with gangrene of the right great toe, secondary to peripheral arteriosclerosis with diabetes, had a culture performed on his toe drainage. The findings were: Staphylococcus, coagulase positive, sensitive to chloromycetin and erythromycetin, resistant to penicillin and tetracycline.
- EXAMPLE 41 A 23-year old male with bilaterally infected ingrown toenails on the great toe was treated on the right side with a composition containing 2% iodine, 2.3% sodium iodide and 95.7% dimethyl sulfoxide. The left great toe was treated with a tincture of iodine. A single treatment for two minutes was employed. At the end of four days the dimethyl sulfoxide-iodine composition reduced the infection so that the right great toe appeared normal, whereas the left great toe was still moderately inflamed. This shows improved germicidal activity of iodine with dimethyl sulfoxide.
- EXAMPLE 42 The fur was removed from a back area on four rabbits. Three iodine solutions were prepared which contained 2% iodine in 2.3% sodium iodide water, 46% aqueous ethanol, and 95.7% dimethyl sulfoxide in water. Each test solution was applied to the exposed area of a different rabbit. Gross observation disclosed that skin discoloration with the dimethyl sulfoxide was transitory relative to the discoloration with the other solutions. The two water and alcohol solutions produced long-lasting surface stains.
- EXAMPLE 43 The four was removed from the anterior abdominal area on six rabbits. Two rabbits had 100% dimethyl sulfoxide applied to the areas; two other rabbits had 2% tincture of iodine applied to the areas; and the other two rabbits had a composition applied which contained 2% iodine, 2.3% sodium iodide and .7% dimethyl sulfoxide. A full thickness biopsy was taken from the exposed skin areas, the samples transferred to a tube and cultured, and colony counts were taken. The colony counts ranged from 280- on the two rabbits which received the tincture of iodine alone. The counts were 20 to 30 on the animals receiving dimethyl sulfoxide alone and the counts were 2 and 3 respectively on the two animals receiving the composition of iodine and dimethyl sulfoxide.
- viruses Illustrative of diseases caused by viruses are smallpox, measles, encephalitis, herpes, rabies, etc.
- Idoxuridine (5-iodo-2'-deoxyuridine), N-methylisatin beta thiosemicarbazone, and amantadine.
- Idoxuridine is useful in treating herpes simplex keratitis, and N-methylisatin beta thiosemicarbazone has proved useful in preventing smallpox after exposure to this disease.
- EXAMPLE 44 The following lotion may be formulated incorporating idoxuridene at a concentration 0.1 gm./cc. of the following lotion base:
- the foregoing lotion may be employed in the treatment of herpes simplex by cutaneous application directly to skin lesions, q.i.d.
- the primary disorders caused by protozoa are malaria and amebiasis.
- the principal drugs employed in the treatment of malaria are quinine, quinacine, quinoline derivativcs, and chlorophenyl derivatives.
- various drugs are employed such as emetine, various arsenical amebacides, hydroxyquinoline derivatives, antimalarial drugs and antibiotics, such as bacitracin, chlortetracycline hydrochloride, oxytetracycline hydrochloride, carbomycin, erythromycin, paromomycin, and fumagillin.
- antibiotics such as bacitracin, chlortetracycline hydrochloride, oxytetracycline hydrochloride, carbomycin, erythromycin, paromomycin, and fumagillin.
- vaginal jelly may be prepared and buffered to a pH of about 4.0:
- vaginal jelly may be administered intravaginally as an average dose of cc. in the evening before resting and again in the morning for the treatment of Trichomonas vaginalis.
- yeasts Various diseases arecaused by yeasts. These include moniliasis and North American blastomycosis. Antimicrobial agents employed in treating these diseases include nystatin, amphotericin B, sulfonamides and diamidines.
- EXAMPLE 46 The following lotion for topical application to areas infected with yeast organisms may be prepared:
- Antihistamines are agents which antagonize the pharmacological actions of histamine. They are employed in the symptomatic treatment of various allergic states wherein the antihistamine suppresses the symptoms attributable to the actions of histamine released in the body in these disorders. Illustrative of such allery states are allergies of the respiratory tract, for example, coryza, hay fever and vasomotor rhinitis, allergic dermatoses, angioedema and systemic allergies, for example serum sickness and drug reactions. Additionally, various chemicals and drugs cause histamine release in the body.
- Antihistamines also have central nervous system activity as sedatives and hypnotics. They are used in treating nausea and vomiting (antiemetic use), insomnia and symptoms of parkinsonism. They also have local anaesthetic activity making them useful in control of itching.
- Antihistamines include the ethanolamines, e.g. diphenhydramine, the ethylenediamines, e.g. pyrilamine, the alkylamines, e.g. chlorpheniramine, the piperazines, e.g. chlorcyclizine, and the phenothiazines, e.g. promethazine.
- antihistamines may be used to counter the side effects due to histamine release caused by the application of DMSO to tissue.
- antihistamines may be incorporated into DMSO formulations for topical application (the DMSO being employed either to enhance penetration of some other agent or for its own direct pharmacological effect) to suppress symptoms of histamine release caused by the DMSO (e.g. urticaria, burning sensation, etc.).
- the DMSO being employed either to enhance penetration of some other agent or for its own direct pharmacological effect
- symptoms of histamine release caused by the DMSO e.g. urticaria, burning sensation, etc.
- EXAMPLE 47 A twenty-two year old white male subject was treated who had a three hour history of a common col-d. He had marked nasal congestion and discharge. Two mg. of diphenhydramine hydrochloride (Benadryl) in 0.5 cc. of normal saline was placed into each nostril. The symptoms cleared, and the subject was asymptomatic for one and one-half hours. One half cc. of 50% dimethyl sulfoxide in Water was placed in each nostril. The symptoms cleared and remained relieved for three hours.
- Two mg. of diphenhydramine hydrochloride (Benadryl) in 0.5 cc. of normal saline was placed into each nostril. The symptoms cleared, and the subject was asymptomatic for one and one-half hours. One half cc. of 50% dimethyl sulfoxide in Water was placed in each nostril. The symptoms cleared and remained relieved for three hours.
- the subject was treated with 0.5 cc. of 50% dimethyl sulfoxide in an aqueous solution containing 2 mgs. of diphenhydramine hydrochloride. The symptoms were quickly relieved and remained absent for twelve hours.
- EXAMPLE 48 A cyclizine hydrochloride mist formulation may be prepared and charged into an aerosol container to provide fifty mg. doses which may be administered intranasally for treatment of allergy states and motion sickness, etc. Five grams of cyclizine hydrochloride are incorporated in a halocarbon propellant formulation base containing 4% by volume DMSO.
- EXAMPLE 49 A topical ointment formulation of tripelennamine base particularly suitable for treatment of itching dermatoses (applied to the alTected area several times daily), may be formulated as follows:
- Neuropharmacologic agents are those agents having a pharmacolog-ic activity involving the nervous system. Central nervous system active drugs have their site of activity in the brain and/or spinal cord. Other agents have their activity in the peripheral nervous system. In every case, the rapidity and magnitude of response to a neuropharmacologic agent is dependent upon the speed and extent of conduction or movement of the agent from the site of administration to the site of activity in the nervous system. In many instances, the usefulness of such drugs is limited by the inability of such agents to rapidly penetrate membranes to achieve a useful concentration or distribution at the site of activity in the nervous system. The use of any neuropharmacologic drug must take into account the problem of getting the drug from the periphery to the action site which requires transport across neural barriers, including the blood-brain barrier in the case of CNS agents.
- Central nervous system active agents are those agents which stimulate, depress or otherwise modify central nervous system function, either in a selective or nonselective manner. Most of the central nervous system active agents described and illustrated under the followingsubheadings have useful activity in one or more supramedullary portions of the brain, i.e., those portions lying above the medulla oblongata including the cerebrum, cerebellum, thalamus, and hypothalamus. An example is aminophylline of Example 34 which is active in the cerebral cortex. Agents which provoke a neuropharmacologic response in the central nervous system generally must pass through the body from the site of administration, through the blood stream, to the blood/ brain barrier. To carry out their activity, these agents then must pass through this barrier.
- Analgesics and antipyretics exert type of depressing action upon the central nervous system, the result of which is the obtunding of pain senations without the loss of consciousness.
- Some classes of analgesics e.g. the salicylates, para-aminophenol derivatives and the pyrazolon derivatives, also are antipyretics, that is, they lower abnormal body temperature through a predominately CNS action. Additionally many agents in these classes have other actions such as antiinfiamniatory action.
- the para-aminophenol derivatives include acetanilid, acetophenetidin and acetaminophen.
- salicylates are acetylsalicylic acid and salicylic acid and their non-toxic salts, esters and related derivatives.
- the pyrazolon derivatives include antipyrine aminopyrine and phenylbutazone.
- the narcotic analgesics include morphine, codeine, meperidine, opium, etc. Preceding Example 34, and following Examples 50 and 67 are illustrative:
- EXAMPLE 50 The following injectible formulation is prepared in 2 cc. ampules to provide doses of 1-2 cc. for intramuscular injection (q.i.d. for sustained relief):
- EXAMPLE 51 Three groups of dogs were evaluated. Three dogs in group No. 1, weighing about 15 to 18 kgs., were given 1 cc. containing 50 mgs. of sodium pentobarital (Nembutal) per pounds of body weight, intravenously. This produced a profound anaesthetic effect, allowing an abdominal operation without causing the dog any discomfort. Another group of three dogs were given 1 cc. of Nembutal per pounds of body weight. These dogs remained partially awake and surgery could not be performed without causing discomfort to the dogs. The last group of three dogs were given 1 cc. of Nembutal per 10 pounds of body Weight plus 1 gram of dimethyl sulfoxide per 2 pounds of body weight, instilled orally through a gastric tube. After one-half hour, surgery could be performed without the animal experiencing any discomfort or moving. This example illustrates potentiation of barbiturate with dimethyl sulfoxide.
- a chloral hydrate suppository formulation may be prepared by blending together:
- the melt is poured into a suppository mold and cooled to form 10 suppositories each supplying a 1 gram dose.
- One or two suppositories, as indicated, may be administered as a general sedative.
- CNS stimulants Agents in this category include strychnine picrotoxin, pentyleuetetrazol and the xanthines (e.g. theophylline, theobromide and aminophylline). These agents generally operate by the mechanism of blockage of inhibition (e.g. strychnine) or by direct neuronal excitation (e.g. pentylenetetrazol).
- strychnine picrotoxin e.g. theophylline, theobromide and aminophylline
- xanthines e.g. theophylline, theobromide and aminophylline
- These agents generally operate by the mechanism of blockage of inhibition (e.g. strychnine) or by direct neuronal excitation (e.g. pentylenetetrazol).
- Preceding Example 34 and following Examples 53 and 69 are illustrative:
- a unit dose suppository form of imipramine can be prepared by melting together:
- This dosage may be administered rectally T.I.D. to relieve depression.
- Anticonvulsants and centrally acting muscle relaxants EXAMPLE 54 The following parenteral formulation may be prepared and sterilized for treatment of grand mal and psychomotor epilepsy to achieve more rapid therapeutic benefit.
- the dose is 1-3 cc. preferably administered intramuscularly.
- Psychiatric disorders fall into several categories. Drugs used to treat anxiety and neurotic conditions include the benzodiazepine derivatives, meprobamate and various other non-barbituate and barbituate sedatives which have been treated previously concerning their employment in the present invention, under the heading of general CNS depressants.
- the predominant drugs employed to treat psychoses are primarily the phenothiazines and the rauwolfia alkaloids.
- monoamine oxidase inhibitors and dibenzazepine derivatives are the predominant drugs.
- Preceding Example 53 and the following example illustrate the use of DMSO to enhance penetration of these agents:
- EXAMPLE 55 The following formulation may be melted together, placed in a suppository mold and cooled to form a unit dose for rectal application as a monoamine oxidase inhibitor for treatment of depressive states:
- Peripheral nervous system active agents Agents which have activity in the peripheral nervous system include local anaesthetics which reversibly block nerve conduction when applied locally to nerve tissue, thereby to relieve pain. They also include agents which have activity at various sites in the autonomic nervous system, including anticholinesterase agents, parasympathomimetic agents, sympathomimetic agents, antimuscarinic agents, adrenergic blocking agents, ganglionic blocking and stimulating agents and neuromuscular blocking agents. Following is a discussion and illustration of the employment of DMSO- with these classes of agents in accordance with the invention.
- hydrophilic amino group a tertiary or secondary amine
- these agents are procaine, lidocaine, piperocaine, dibucaine, tetracaine, cyclomethycaine, pramoxine and dimethisoquin.
- Others include benzocaine, orthoform, butyl aminobenzoate, benzyl alcohol, methol, phenol and quinine. Antihistamines have also been employed for this purpose.
- DMSO water soluble salts
- Advantageously DMSO may permit use of the free base form when its is employed as a solvent for the local anaesthetic in addition to being utilized as a penetrating agent.
- Employment of local anaesthetics with DMSO may provide a special advantage in relieving the burning sensation frequently experienced when DMSO is applied topically for its own pharmaceutical effects or for enhancing the penetration of yet another pharmaceutical agent.
- the following examples are illustrative:
- EXAMPLE 56 A 1% procaine hydrochloride isotonic solution was administered by subcutaneous method in 0.5 mm. doses in the human skin. In another human subject 1% procaine in isotonic solution containing v./v. of dimethyl sulfoxide was administered by subcutaneous injection in a 0.5 mm. dose. The dimethyl sulfoxide composition produced a local anaesthetic efiect having a prolonged activity of 1.5 times procaine alone.
- SolutionA Lidocaine hydrochloride (2%) 2 Trisodium phosphate 2 Glycerine 2
- SolutionB Lidocaine hydrochloride (2%) 2 Trisodium phosphate buffer 2 Dimethyl sulfoxide 2 Solution A was administered topically to the general area overlying the mental foramen of one human subject, and solution B was also administered topically to the mental foramen of another human subject. The general area overlying the mental foramen is in midline of the exterior surface of the mandible.
- Solution B produces sutficient local anaesethesia within fifteen minutes to permit a lower bicuspid tooth with carious lesions to be drilled without discomfort.
- the subject receiving solution A did not develop such a level of anaesthesia within the same time limit.
- EXAMPLE 59 A forty year old female subject with pruritis ani was given a topical application of 3 cc. of 100% dimethyl sulfoxide to the irritated area. Relief of itching occurred in fifteen minutes and lasted for eight hours. The subject complained of a mild burning sensation in the area of application which lasted for ten minutes. The same burning sensation was reported after each of four applications over a two-day period.
- EXAMPLE 60 Two solutions were prepared, one containing 0.44% xylocaine base in 100% dimethyl sulfoxide and the other containing 0.5% menthol in 100% dimethyl sulfoxide. Human subjects who previously reported a burning sensation with 100% dimethyl sulfoxide reported absence of such a burn when they were given like amounts of the two solutions in a like dermal application.
- Neostigmine one of the most prominent anticholinesterase agents, may be formulated with DMSO in single dosage'form as follows:
- Neostigmine base mg 0.5 DMSO ml 0.7 Water ml 0.3 Methyl propyl paraben gm 0.0002
- This formulation may be packaged in 1 cc. ampules each of which is then diluted with 4 cc. of distilled water for bladder instillation as a preventative of post-operative distention and urine retention. The dosage is repeated every 4-6 hours as needed.
- EXAMPLE 62 To demonstrate enhanced penetration of the sympathomimetic agent epinephrine, epinephrine hydrochloride is dissolved in aqueous DMSO to a concentration of 0.05% and applied topically to the stretched ear of a hamster fixed in position for low power microscope viewing of the capillary bed. Whereas epinephrine hydrochloride dissolved in water (at the same concentration) applied to the hamster ear produces no visible change in appearance of the capillary bed, with the DMSO formulation pronounced constricture of the capillary bed is observed by microscope and a general blanching of skin is seen. This effect is transistory. The same DMSO formulation may be used as a nasal spray for relief of asthmatic attacks.
- EXAMPLE 63 The sympathomimetic agent, methamphetamine may be formulated in a unit dose with DMSO for intramuscular injection as follows:
- the product is packaged in a 1 cc. ampule for administration to maintain blood pressure in hypotensive states as during spinal anaesthesia.
- Mecamylamine is representative of agents having a site of activity at the autonomic ganglia (ganglionic stimulating and blocking agents). It may be formulated as follows to provide a single dose in suppository form for rectal application in treatment of hypertension:
- EXAMPLE 65 Also exemplary of adrenergic agents is the adrenegic blocking agent dihydroergotamine.
- a topical lotion may be formulated as follows:
- Two cc. of this preparation may be applied topically in treatment of herpes zoster for relief of neuritic pain or for peripheral vasodilation in arterial deficiencies.
- EXAMPLE 66 Representative of parasympathomimetic agents is pi ocarpine.
- the following eye drop formulation may be repared:
- a typical dose for the treatment of chronic open-angle glaucoma is l-2 drops in the eye every 4-6 hours.
- Anti-inflammatory agents 32 EXAMPLE 67 The following phenylbutazone topical formulation may be prepared and applied in unit doses of 10 cc. bid topically to the involved area to treat musculoskelatan pain and inflammation:
- DMSO Anticoagulants are agents used primarily in thromboembolic conditions to prevent formation of intra-vascular .thrombi and to maintain normal hemostasis. Heparin and its soluble metal salts, the most quick acting anticoagulants, previously required parenteral administration so the employment of DMSO to permit topical application is of considerable advantage.
- the coumarin and indandione derivatives, e.g. bishydroxycoumarin and henindione, may be administered orally. However, in some circumstances, their topical application may be advantageous. When applied topically with DMSO, these agents may be penetrated into the general circulation to provide the desired blood level. Reference is made to foregoing Example 34 and to the following example for illustration of the use of DMSO to enhance penetration of this class of agents:
- EXAMPLE 68 Forty thousand units of heparin (1 cc.) with 1 cc. dimethyl sulfoxide was placed onto human skin (left forearmthirty nine year old male). A Lee and White 3 tube clotting time was taken prior to application. This was 11 minutes.
- Clotting times were taken at 2 hours and 4 hours subsequent to administration. At 2 and 4 hours, the clotting times were 14 and 18 minutes respectively.
- This example shows that dimethyl sulfoxide was associated with absorption of heparin through human skin.
- Vasodilators are generally used clinically in treatment of ischemic conditions, especially myocardial hypoxia, as in angina pectoris, and to some extent in ischemia of skeletal muscle. Their basic pharmacological action is the relaxation of smooth muscle to effect dilation.
- These agents include the nitrides, such as sodium nitrite, glyceryl tri-nitrate and isosorbide di-nitrate, di-pyridamole, cyclandelate, nicotinic acid and aminophylline.
- DMSO may be utilized to promote penetration for topical application of these agents to provide the desired systemic concentration.
- the following examples and foregoing example 34 illustrates the use of DMSO to enhance penetration of this class of agents:
- EXAMPLE 69 Aminophylline is a known diuretic, central nervous system stimulant, coronary vasodilator and bronchodilator which is normally absorbed across the bladder walls.
- the control and test solutions were instilled in the freshly evacuated bladders of two dogs in an amount of 75 cc. Blood samples were taken at different time periods for each dog, and analysis for aminophylline by the Brakett and Bradford test was done. The results in the following table showed an increased amount of aminophy line in the blood of the dog receiving the test solution.
- a group of two rats received 100 mgs. of nicotinic acid in 4 cc. of 100% dimethyl sulfoxide applied to the anterior abdomen. A wet state of application was maintained.
- a control group of two rats received 100 mgs. of nicotinic acid in 4 cc. of saline. At the end of two hours, the test group showed noticeable vasodilation of the skin with an increase in cutaneous temperature. These observations were absent in the control group.
- This example shows increased penetration with dimethyl sulfoxide of an agent which is both a vasodilator and a vitamin.
- a glycerol trinitrate ointment may be prepared by blending the following ingredients:
- Ultraviolet screening agents Compounds which screen a part or all ultraviolet light from the skin to protect the skin from the damaging effects of over-exposure to sunlight are called ultraviolet absorbers or screening agents. They are applied topically to the skin prior to exposure to absorb the ultraviolet rays to thereby prevent injury to the skin. Examples of such agents are Z-ethoxyethyl p-methoxy cinnamate, digalloyl trioleate, menthyl anthranilate, p-aminobenzoic acid, phenyl salicylate, and the benzophenones, e. g. 2,4-dihydroxybenzophenone and 2,2'-dihydroxy-4,4'-dimethoxy benzophenone. DMSO may be utilized to enhance penetration of these agents into the epidermis, thereby to increase their effectiveness and to increase their lasting power by inhibiting their accidental removal from the skin through bathing, perspiration, etc. The following example is illustrative:
- EXAMPLE 72 A male subject had a skin markedly sensitive to ultraviolet light.
- a test solution was made containing 1% ultraviolet absorber in 100% dimethyl sulfoxide.
- a control solution was made containing the ultraviolet absorber in 100% ethanol, and both solutions were similarly thickened with Carbowax 4000 to provide lotion forms.
- the ultraviolet absorber was 2,2-dihydroxy-4,4'-dimethoxy benzophenone.
- the two lotions were applied to different sides of the subjects face. After one day of severe sun exposure, the subject was examined. The side with the control application showed marked redness. The side with the test application showed only slight redness. Two days later, the control side was blistered, whereas the test side was normal and free of redness.
- Tissue compatible cationic dyes are employed in tissue staining both in vivo and in vitro for diagnostic procedures. For use in vivo, this may be for marking or following visually the tissue penetration of another agent or for highlighting or outlining a particular organ or structure for visual diagnosis. For example, sodium indigotindisulfonate is injected for localizing ureteral orifaces. Cationic dyes are used for in vitro tissue staining to fix cellular structure and the like for microscopic observation and evaluation. Radiopaque media are used in roentgenography of various body structures, usually administered by injection. Preceding Example 34 and the following examples illustrate the use of DMSO- to enhance tissue penetration of diagnostic dyes and radiopaque media:
- EXAMPLE 73 A solution of 2% basic green (MX) dye in dimethyl sulfoxide was applied to the freshly washed skin of the forearm. The same dye in a like concentration in water, ethanol, acetone and ethylene glycol, was also applied to freshly washed areas of the forearm. The excess dye was removed with detergent or water, and the extent and depth of the dyeing was determined by stripping away approximately 0.5 mm. thick layer of skin with adhesive tape. The dye and dimethyl sulfoxide was found to be the only composition which carried the dye to the deeper dermal layers. This shows the enhanced dye absorption when administered in combination with dimethyl sulfoxide.
- MX basic green
- EXAMPLE 74 A 25% solution of iodine in aqueous sodium iodide was prepared as a first diagnostic solution, and a 25 solution of iodine in 100% dimethyl sulfoxide was prepared as a second diagnostic solution. Twenty ml. of each solution was injected into the intermedulla of femur bones. The first solution was injected into the right femur, and the second into the left femur of the same subject. X-ray photographs were taken at 5-minute sequences over 240 minutes of both femurs. After 40 minutes, a picture of the left femur, into which was injected the second solution, showed the entire intermedullar space to be radiopaque.
- the first solution in the right femur was rapidly diffusing into the vascular system and being removed from the bone.
- a picture of the left femur was still clearly defined as being radiopaque.
- a picture of the right femur showed no evidence of opacity except for about a one centimeter circle around the injection site.
- Nutrients As used herein the term nutrients is intended to comprehend the vitamins, carbohydrates, fats, proteins, including proteinaceous hormones and mineral nutrients used by the body to sustain and regulate metabolism and furnish energy.
- Exemplary of the carbohydrates are glucose see Example 1) and dextrins, (e.g. maltose dextrins).
- Metabolizable fats are the glyceryl esters of fatty acids, eg vegetable oils.
- the various commercial protein hydrolyzates, e.g. hydrolyzed casein, and insulin are representative of the proteins.
- the vitamins include the water-soluble vitamins, e.g. vitamins B B B and B nicotinic acid, pantothenic acid and p-aminobenzoic acid and the fat soluble vitamins, e.g.
- Mineral nutrients include inorganic salts of fluorine, iodine, manganese, potassium, iron, zinc, copper magnesium calcium and phosphorous.
- DMSO is useful in enhancing tissue penetration of nutrients for assimulation by the body particularly by the topical or injection routes. Preceding Examples 1 and 70 and the following additional examples are illustrative:
- EXAMPLE 75 Two dogs of approximately 15 kgs. of body weight were starved for twenty-four hours and administered three units of crystalline zinc insulin subcataneously. Another group of two dogs was starved for twenty-four hours and administered three units of insulin subcutaneously in 1 cc. of 100% dimethyl sulfoxide. The dogs given the composition including the dimethyl sulfoxide were observed to show signs of severe insulin shock two hours after ad- 35 ministration. The insulin without dimethyl sulfoxide did not produce a pronounced physiological response.
- EXAMPLE 76 Four dogs with pancreatectomy were given insulin orally. A group of two dogs were used for controls and were given 15 units of insulin in 3 cc. of isotonic saline, and the other group of two dogs was given 15 units of insulin in 3 cc. of 99% dimethyl sulfoxide. Blood sugars were taken at one, two and four hours. The two dogs in the control group started with blood sugars of 82 mg. percent and 90 mg. percent. At four hours, the blood sugars had risen to 100 and 110 mg. percent.
- the two animals in the test group receiving the dimethyl sulfoxide started with blood sugars of 80 mg. percent and 85 mg. percent, and at the end of two hours, one had 60 mg. percent and the other 65 mg. percent. At the end of the four hours, one had 40 mg. percent and the other 35 mg. percent. It is believed that the composition containing dimethyl sulfoxide enhanced penetration of the insulin through the esophageal wall, since insulin is known to be destroyed in the stomach.
- EXAMPLE 77 A group of two rats received 0.5 gms. of ammonium fluoride in 4 cc. of 100% dimethyl sulfoxide by applying this composition over the abdomen. Another group of two rats served as controls, receiving 0.5 gms. of ammonium fluoride in 4 cc. of isotonic saline. A wet system was maintained. The test group receiving dimethyl sulfoxide and the ammonium fluoride showed typical epileptiform convulsions associated with the absorption of large amounts of fluoride. The control group did not show such convulsions. This example shows that dimethyl sulfoxide enhanced absorption of ammonium fluoride through intact skin and therefore may increase fluoride absorption into teeth.
- An ointment base may be prepared from the following:
- Lanolin 90 DMSO 10 Isopropyl myistate 5 to which is added 1800 U.S.P. units of Vitamin A and 300 U.S.P. units of Vitamin D per gram of ointment base. This ointment is applied topically for the treatment of burns, skin irritation, diaper rash and pruritis.
- EXAMPLE 79 Tests were done with monkey kidney cell tissue cultures containing conventional tissue culture media (containing glucose, minerals and amino acids). Two groups of tests were made with replicates. To one group of tissue culture tests was added 0.003% dimethyl sulfoxide, and the other group was retained as a control. Cell counts were performed after three days, and control groups averaged l,683,000 per cc., whereas the test group with dimethyl sulfoxide tubes averaged 6,804,000 cells per cc. Enhanced cell proliferation, therefore, occurred in cultures containing dimethyl sulfoxide. The growth is believed to have occurred from greater utilization of the nutrient in the tissue cultures containing dimethyl sulfoxide.
- a method of enhancing the penetration into and across an external membrane barrier of a human or animal subject of a chemical agent capable of eliciting a physiological effect upon topical application thereof said agent being selected from the group consisting of non-estrogenic, antineoplastic agents, antigens, antihistamic agents, neuropharmacologic agents, antiinflammatory agents, anticoagulants, vasodilators, ultra-violet screening agents, diagnostic dyes, diagnostic radiopaque agents and nutrients, which comprise the concurrent topical administration to the external membrane of an amount of said agent effective to produce the desired physiological effect and an amount of DMSO sufficient to effectively enhance penetration of said agent to achieve the desired physiological effect.
- agent is an antineoplastic agent selected from the group consisting of alkylating agents and antimetabolites.
- composition contains a pharmaceutically acceptable thickening agent in an amount sufficient to materially increase the viscosity thereof, whereby to facilitate topical application.
- composition is in the form of an ointment.
- composition is in the form of a lotion.
- composition is in the form of a suppository.
- a method of enhacing the tissue penetration of an injectable chemical agent capable of eliciting a physiological effect in a human or animal subject said agent being seleted from the group consisting of antineoplastic agents, antihistaminic agents, neuropharmacologic agents having a useful activity in a supramedullary portion of the brain, central nervous system depressants, analgesics, local anaesthetics, antiinflammatory agents, anticoagulants, vasodilators, diagnostic dyes, diagnostic radiopaque agents and nutrients, which comprises the concurrent administration to said subject of an injected amount of said agent effective to produce the desired physiological effect and an amount of DMSO effective topically or by injection to enhance penetration of said agent into said tissue to achieve the desired physiological effect.
- DMSO is administered by injection in a composition containing at least about 1% by weight of DMST.
- a method of enhancing the penetration of a cationic dye through cell membranes of animal cells for diagnostic purposes which comprise applying to said cell membranes a composition comprising an amount of said dye effective to stain said cells and an amount of DMSO effective to enhance penetration of said dye into said cells.
- a method of enhancing the penetration of a cationic dye through cell membranes of animal cells for diagnostic purposes which comprise applying to said cell membranes a composition comprising an amount of said dye effective to stain said cells and an amount of DMSO effective to enhance penetration of said dye into said cells.
- antineoplastic agent is selected from the group consisting of albylating agents an antimetabolites.
Description
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US753231A Expired - Lifetime US3551554A (en) | 1968-08-16 | 1968-08-16 | Enhancing tissue penetration of physiologically active agents with dmso |
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