# Patent

## Title
Arylmethylphosphonates and phosphonic acids useful as anti-inflammatory

## Abstract

This application is a continuation, of application Ser. No. 850,325, filed as PCT/JP88/00187, Feb. 22, 1988 now abandoned, which is a division of U.S. application Ser. No. 298,610, filed Oct. 5, 1988 now U.S. Pat. No. 5,120,716.

## Background
This invention relates to a percutaneous absorption promoting agent and a dermatologic preparation containing said percutaneous absorption promoting agent. More particularly, the present invention relates to a percutaneous absorption promoting agent comprising (A) at least one anionic surfactant and one or two or more of surfactants having a nitrogen atom in the molecule other than anionic surfactants, (B) one or two or more of anionic surfactants and one or two or more of nonionic surfactants not having a nitrogen atom in the molecule, (C) one or two or more of surfactants selected from the group consisting of amphoteric surfactants and semi-polar surfactants and at least one nonionic surfactant having a nitrogen atom in the molecule, (D) one or two or more of surfactants selected from the group consisting of nonionic surfactants, amphoteric surfactants, semi-polar surfactants and cationic surfactants having a nitrogen atom in the molecule, and one or two or more of nonionic surfactants not having a nitrogen atom in the molecule, or (E) an amine oxide as the active ingredient, and dermatological preparation containing these percutaneous absorption promoting agent and drug components.

Heretofore a drug component has been administered by oral administration, administration by injection, intramuscular or intravenous administration, administration to intestine or mucosa within the mouth, etc. Among them, oral administration has been most widely practiced. However, in the case of oral administration, drawbacks have occurred such that the concentration has become temporarily higher than is necessary to ensured persistence of the effect and that side effects such as stomach disorder or lack of appetite may be caused. On the other hand, although absorption is rapid in administration by injection, this must be made by an expert such as physician, etc.

Recently, dermatologic preparations by percutaneous administration have been developed to eliminate such side effects and drawbacks. However, even in such dermatologic preparations, a sufficient percutaneous absorptivity has not been yet obtained in most cases, and therefore, they are not considered satisfactory.

Further, the surface of the skin is called the skin corneum layer, which has in itself a physiological function as a barrier for protection against the penetration of foreign matter from outside of the body, and therefore, a sufficient percutaneous absorptivity can not be obtained by merely formulating a drug component in a base conventionally used in the prior art in a dermatologic preparation.

To improve this factor, various percutaneous absorption promoting agents have been proposed in recent years. For example, dimethyl sulfoxide, dimethylformamide, dimethylacetamide, methyldecyl sulfoxide, etc., are known, but these cannot be considered to have a sufficient percutaneous absorption promoting effect, safety and use feeling.

Accordingly, an object of the present invention is to solve the problems of the prior art as mentioned above and provide a percutaneous absorption promoting agent having an excellent percutaneous absorption promoting effect of a drug component, and further satisfactory with respect to safety and use feeling. Another object of the present invention is to provide a dermatologic preparation comprising the percutaneous absorption promoting agent and a drug component, which is an excellent percutaneous absorption agent promoting the effect of the drug component and further, is satisfactory with respect to safety and use feeling.

Other objects and advantages of the present invention will be apparent from the following description.

That is, the present invention provides a percutaneous absorption promoting agent for a drug component, comprising one or two or more of anionic surfactants and one or two or more of surfactants having a nitrogen atom in the molecule other than the anionic surfactants as the active ingredients and a dermatologic preparation containing a desired drug component and the above percutaneous absorption promoting agent.

The present invention also provides a percutaneous absorption promoting agent for a drug component, comprising one or two or more of amphoteric surfactants and semi-polar surfactants and one or two or more of nonionic surfactants having a nitrogen atom in the molecule as the active ingredients, and a dermatologic preparation containing a desired drug component, and the above percutaneous absorption promoting agent ingredients.

The present invention further provides a percutaneous absorption promoting agent for a drug component, comprising one or two or more of anionic surfactants and one or two or more of nonionic surfactants not having a nitrogen atom in the molecule as the active ingredients, and a dermatologic preparation containing a desired drug component, and the above percutaneous absorption promoting agent.

The present invention further provides a percutaneous absorption promoting agent for a drug component, comprising one or two or more selected from the group consisting of nonionic surfactants, amphoteric surfactants, semi-polar surfactants and cationic surfactants having a nitrogen atom in the molecule and one or two or more of nonionic surfactants not having a nitrogen atom in the molecule as the active ingredients, and a dermatologic preparation containing a desired drug component, and the above percutaneous absorption promoting agent.

The present invention further provides a percutaneous absorption promoting agent for a drug component, comprising an amine oxide as the active ingredient, and a dermatologic preparation containing a desired drug component, and the above percutaneous absorption promoting agent.

The constitution of the present invention is now described in detail.

The above anionic surfactant may include anionic surfactants having one or two or more of a carboxylic acid group, sulfonic acid group, sulfuric acid ester group, and phosphoric acid ester group, in the molecule. Those having a carboxylic acid group may include fatty acid soap, ester carboxylic acid and salts thereof, carboxylic acid salts such as condensates of amil acid and fatty acid, etc.; those having a sulfonic acid salt may include alkylsulfonic acid salts, sulfosuccinic acid, ether sulfonic acid salt, alkylallyl and alkylnaphthalene sulfonic acid salts, N-acylsulfonic acid salt, formalin condensation type sulfonic acid salts, etc.; those having a sulfuric acid ester group, may include sulfated oil, ester sulfuric acid salt, alkylsulfuric acid salt, ether sulfuric acid salt, alkylallyl ether sulfuric acid salt, amidosulfuric acid salt, etc.; those having a phosphoric acid ester group may include alkylphosphoric acid salts, amidophosphoric acid salts, ether phosphoric acid salts, alkylallyl ether phosphoric acid salts, etc. From among these, one or two or more may be selected as desired.

On the other hand, as the surfactant having a nitrogen atom in the molecule other than the anionic surfactant, there may be included nonionic surfactants, amphoteric surfactants semi-polar surfactants, cationic surfactants, etc., having a nitrogen atom in the molecule.

Examples of the nonionic surfactant having a nitrogen atom in the molecule may include fatty acid alkanolamide, polyoxyethylene fatty acid amide, esters of alkanolamine, polyoxyethylene alkylamine, etc.

Examples of the amphoteric surfactant having a nitrogen atom in the molecule may include carboxy betaine such as N,N-dimethyl-N-lauryl-N-carboxymethylammonium betaine, N,N-dimethyl-N-oleyl-N-carboxymethylammonium betaine, etc.; imidazoline derivatives such as 2-lauryl-N-carboxyethyl-N-hydroxyethylimidazolinium betaine, 2-lauryl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, etc.; aminocarboxylic acid salts such as N-cocoalkyl-.beta.-aminopropionic acid sodium salt, N-cocoalkyl-.beta.-iminodipropionic acid disodium salt, etc.; sulfobetaine; aminobetaine, etc.

As the semi-polar surfactant having a nitrogen atom in the molecule, there may be included amine oxides such as lauryldimethylamine oxide, stearyldimethylamine oxide, bis-(2-hydroxyethyl)laurylamine oxide, etc.

As the cationic surfactant having a nitrogen atom in the molecule, there may be included fatty acid amine salts, alkyl quaternary ammonium salts, aromatic quaternary ammonium salts, pyridinium salts, imidazolium salts, etc. From among these, one or more can be selected and used as desired.

The ratio of the above anionic surfactant to the surfactant other than the anionic surfactant having a nitrogen atom in the molecule may be preferably 20:1 to 1:20, more preferably 10:1 to 1:10, in terms of molar ratio.

The anionic surfactant to be used in the second embodiment of the present invention is as described above.

On the other hand, examples of the nonionic surfactant not having a nitrogen atom in the molecule to be used in the second embodiment of the present invention may include sorbitan fatty acid esters such as sorbitan monooleate, sorbitan monoisostearate, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquioleate, sorbitan trioleate, penta-2-ethylhexyl acid diglycerol sorbitan, tetra-2-ethylhexyl acid diglycerol sorbitan, etc.; glycerine polyglycerine fatty acids such as mono-cotton seed oil fatty acid glycerine, mono-erucic acid glycerine, sesquioleic acid glycerine, mono-stearic acid glycerine, mono-stearic acid glycerine malic acid, etc.; propylene glycol fatty acid esters such as mono-stearic acid propylene glycol, etc; hydrophilic nonionic surfactants such as hardened caster oil derivatives, glycerine alkyl ethers, etc.; polyoxyethylene sorbitan fatty acid esters such as POE sorbitan monooleate, sorbitan monostearate, POE sorbitan monooleate, POE sorbitan tetraoleate, etc.; POE sorbitol fatty acid esters such as POE sorbitol monolaurate, POE sorbitol monooleate, POE sorbitol pentaoleate, POE sorbitol monostearate, etc.; POE glycerine fatty acid esters such as POE glycerine monostearate, POE glycerine monoisostearate, POE glycerine triisostearate, etc.; POE fatty acid esters such as POE monooleate, POE distearate, POE monodioleate, distearic acid ethylene glycol, etc.; POE alkyl ethers such as POE lauryl ether, POE oleyl ether, POE stearyl ether, POE behenyl ether, POE  2-octyldodecyl ether, POE cholestanol ether, etc.; POE alkylphenyl ethers such as POE octylphenyl ether, POE nonylphenyl ether, POE dinonylphenyl ether etc.; Pulronic type surfactants such as Pulronic, etc.; POE-POP alkyl ethers such as POE-POP cetyl ether, POE-POP 2-decyltetradecyl ether, POE-POP monobutyl ether, POE-POP hydrogenated lanolin, POE-POP glycerine ether, etc.; fatty acid esters of glycerol or polyglycerol such as diglycerine monooleate, hexaglycerine stearate, decaglycerine monolaurate, etc.; tetra POE-POP ethylenediamine condensates such as Tetronic, etc.; POE caster oil hardened caster oil derivatives such as POE caster oil, POE hardened caster oil, POE hardened caster oil monoisostearate, POE hardened caster oil triisostearate, POE hardened caster oil maleic acid, etc.; POE beeswax lanolin derivatives such as POE sorbitol beeswax, etc.; hydrophilic nonionic surfactants such as POE propylene glycol fatty acid esters, sucrose fatty acid esters, POE nonylphenylformaldehyde condensates, etc.

The ratio of the above anionic surfactant to the nonionic surfactant not having a nitrogen atom in the molecule may be preferably 20:1 to 1:20, more preferably 10:1 to 1:10, in terms of molar ratio.

As the amphoteric surfactant to be used in the third embodiment of the present invention, there may be included carboxybetaine such as N,N-dimethyl-N-lauryl-N-carboxymethylammonium betaine, N-N-dimethyl-N-oleyl-N-carboxymethylammonium betaine, etc.; imidazoline derivatives such as 2-lauryl-N-carboxyethyl-N-hydroxyethylimidazolinium betaine, 2-lauryl-N-carboxylmethyl N-hydroxyethylimidazolinium betaine, etc.; aminocarboxylic acid salts such as N-cocoalkyl-.beta.-aminopropionic acid sodium salt, N-cocoalkyl-.beta.-iminodipropionic acid disodium salt, etc.; sulfobetaine, aminobetaine, etc. Examples of the above semi-polar surfactant may include amine oxides such as lauryldimethylamine oxide, stearyldimethylamine oxide, bis-(2-hydroxylethyl)laurylamine oxide, etc.

In the present invention, one or two or more selected from the group consisting of the above amphoteric surfactants and the above semi-polar surfactants may be used as desired.

On the other hand, as the nonionic surfactant having a nitrogen atom in the molecule, fatty acid alkanol amide, polyoxyethylene fatty acid amide, esters of alkanolamine, polyoxyethylenealkylamine, etc. may be included, and one or two or more may be selected as desired from among these.

The ratio of the above amphoteric surfactant and the semi-polar surfactant to the nonionic surfactant having a nitrogen atom in the molecule may be preferably 20:1 to 1:20, more preferably 10:1 to 1:10, in terms of molar ratio.

In the fourth embodiment of the present invention, the nonionic surfactant, the amphoteric surfactant, the semi-polar surfactant and/or the cationic surfactant having a nitrogen atom in the molecule are used in combination with a nonionic surfactant not having a nitrogen atom in the molecule as described above.

The ratio of one or two or more selected from the group consisting of the nonionic surfactants, the amphoteric surfactants, the semi-polar surfactants and cationic surfactants having a nitrogen atom in the molecule to the nonionic surfactant not having a nitrogen atom in the molecule may be preferably 20:1 to 1:20, preferably 10:1 to 1:10, in terms of molar ratio.

As the amine oxide to be used in the fifth embodiment of the present invention, there may be included those shown below. ##STR1## (wherein R.sub.1, R.sub.2 and R.sub.3 represent straight or branched alkyl group or alkenyl group having 1 to 24 carbon atoms, and at least one of R.sub.1, R.sub.2 and R.sub.3 represent straight or branched alkyl group or alkenyl group having 8 or more carbon atoms).

Specific examples of the amine oxide represented by the formula (I) may include dimethyllaurylamine oxide, dimethyhnyristylamine oxide, dimethylcetylamine oxide, dimethylstearylamine oxide, dimethyloletylamine oxide, dimethylbehenylamine oxide, methyldilaurylamine oxide and the like. ##STR2## (wherein R represents straight or branched alkyl group or alkenyl group having 8 to 24 carbon atoms). (III) ##STR3## (wherein R represents a straight or branched alkyl group or alkenyl group having 8 to 24 carbon atoms, and n represents an integer of 1 to 5).

Of the above amine oxides, one or two or more may be used.

As the drug component, the pharmacological effect of which can be increased by utilization of the above percutaneous absorption promoting agent, the following drugs may be exemplified.

For example, there are steroid type anti-inflammatory agent such as predonizolone, dexamethasone, etc.; non-steroid type anti-inflammatory agent such as indomethacin, fluphenamic acid, mephenamic acid etc.; anti-histamic agents such as chlorophenylamine, diphenehydramine, promethazin, etc.; sulfur agents such as sulfur monomethoxicin, sulfur methizole, etc.; antibiotics such as penicillin, cephalosporin, chloramphenicol, streptomycin, etc.; antifungal agents such as naphthiomate, chlotrimazole, etc.; anti-malignant tumor agents such as cyclophosphamide, busulfan, actinomycin, etc.; analgesics such as morphine, codeine, nalorufin, pentazocin, aspirin, acetanilide, aminopyrin, etc.; narcotics and tranquilizers such as prostaglandins preparations, barbital, thiopental, etc.; phychopharmaceuticals such as chloropromazine, recerpine, chlorodiazeboxide, etc.; anti-Perkinson's disease agents such as chlorozoquisazone, levodopa, etc.; cardiacs such as dikitoxicin, digoxin, etc.; antiarrythmic agents such as hydrochloric acid procainamide, etc.; anti-stenocardia agents such as dipiridamol, amilnitrite, etc.; anti-hypertensives such as diazokiside, minoxyzyl, recerpine, guanitizine nitrate; UV-ray inhibitors such as paraaminobenzoate ester, etc,; melanin, formation inhibitors such as hydroquinone, arbutin, kojic acid, Vitamin C esters, para-hydroxycin namate, etc.; psoriasis PUVA therapeutics such as 8-methoxysolarene, etc.; Vitamins such as Vitamin A, Vitamin E, Vitamin C, coenzyme Q10 (Vitamin Q), etc.; hair growing agents such as cephalantin, swelthiamaline, okisendoron, etc.; hormones such as insulin, estradiol, methylteststeron, etc.; diagnostics; allergen for patch test; insecticides; secticides; humectants; corneum emoliient; hairdyes, and other drug components. Particularly as the drug component, water-soluble drug components such as indomethacin, minoxidyl, hydroquinone, arbutin, kojic acid, Vitamin C, Vitamin C ester, swelthiamaline, caphalantin, etc. can be particularly rapidly absorbed into the skin.

These drug components can be absorbed rapidly into the skin by coating on the skin when mixed with the percutaneous absorption promoting agent of the present invention. In the case of a drug component to be used for topical action, excellent effect can be exhibited by penetrating deeply into the skin, and in the case of drug component to be used for systemic action, this can also exhibit a similarly excellent effect because the drug component is migrated into the blood.

The subject to which these ingredients are applied is, of course, a human being but they can be also effectively used for other animals.

The amount of the drug component formulated may be sufficient to bring about the desired pharmacological effect, which depends also on the kind of the drug component, body weight of the patient, severity of the disease, etc.; but it may be preferably 0.001 to 5 parts by weight of the percutaneous absorption promoting agent, more preferably 0.01 to 30 parts by weight, per 1 part by weight of the drug component.

The above percutaneous absorption promoting agent may be used by suitably mixing the drug component as such, but is generally used by mixing the constituents in a base for dermatologic preparation such as cream preparation, ointment preparation, gel preparation, lotion preparation, emulsion adhesive tape, etc.

The amount of the respective constituents in that case may differ depending on the kind of the drug component, but generally the following ranges are the preferred ranges of the amount formulated. That is, the total amount of the anionic surfactant and the surfactant other than the anionic surfactant having a nitrogen atom in the molecule may be 0.001 to 10% by weight, more preferably 0.01 to 5% by weight in the dermatologic preparation, and the drug component may be 0.001 to 10% by weight, more preferably 0.01 to 5% by weight. On the other hand, for the ratio of the anionic surfactant to the surfactant having a nitrogen atom in the molecule other than anionic surfactants, the ratio as mentioned above, namely 20:1 to 1:20, preferably 10:1 to 1:10 may be applied as such.

On the other hand, the total amount formulated of the amphoteric surfactant and the semi-polar surfactant and the nonionic surfactant having a nitrogen atom in the molecule may be 0.001 to 10% by weight, more preferably 0.01 to 5% by weight in the dermatologic preparation, and the drug component may be 0.001 to 10% by weight, more preferably 0.01 to 5% by weight. For the ratio of the amphoteric surfactant and the semi-polar surfactant to the nonionic surfactant having a nitrogen atom in the molecule, the ratio as described above, namely 20:1 to 1:20, preferably 10:1 to 1:10 in terms of molar ratio may be applied as such.

The total amount of the anionic surfactant and the nonionic surfactant not having a nitrogen atom in the molecule may be 0.001 to 10% by weight, more preferably 0.01 to 5% by weight in the dermatologic preparation, while the drug component may be 0.001 to 10% by weight, more preferably 0.01 to 5% by weight. For the ratio of the anionic surfactant to the nonionic surfactant not having a nitrogen atom in the molecule, the ratio as described above, namely 20:1 to 1:20, preferably 10:1 to 1:10 in terms of molar ratio may be applied as such.

Further, the total amount formulated of one or more selected from the group consisting of nonionic surfactants, amphoteric surfactants, semi-polar surfactants and canionic surfactants having a nitrogen atom in the molecule and one or more of nonionic surfactants not having a nitrogen atom in the molecule may be 0.001 to 10% by weight, more preferably 0.01 to 5% by weight in the dermatologic preparation, and the drug component may be 0.001 to 10% by weight, more preferably 0.01 to 5% by weight. For the ratio of one or two or more selected from the group consisting of nonionic surfactants, amphoteric surfactants, semi-polar surfactants and canionic surfactants having a nitrogen atom in the molecule to one or two or more of nonionic surfactants having a nitrogen atom in the molecule, the ratio as mentioned above, namely 20:1 to 1:20, preferably 10:1 to 1:10 in terms of molar ratio may be applied as such.

Further, the amount of amine oxide formulated may be 0.0001 to 10% by weight, more preferably 0.01 to 5% by weight in the dermatologic preparation. The amount of the drug component may be 0.001 to 10% by weight, more preferably 0.01 to 5% by weight.

In the dermatologic preparation promoting the percutaneous absorption of drug component according to the present invention, it is also possible to formulate components as generally formulated in drugs, quasi drugs, cosmetic, etc. Examples of such components may include polyhydric alcohol, oil component, wax, acid, alkali, cationic surfactant, nonionic surfactant, anionic surfactant, amphoteric surfactant, powder, pigment, dye, preservative antifungal agent, anti-oxidant, UV-ray absorber, chelating agent, water-soluble polymer, montmorilonite, alcohol, solvent, flavor, etc.

More specifically, there may be included polyhydric alcohols such as glycerine, propylene glycol, etc.; oil components such as fluid paraffin, squalane, higher fatty acid, higher alcohol, etc.; organic acids such as citric acid, lactic acid, etc.; alkalis such as caustic soda, triethanolamine, etc.; anionic surfactants such as higher alkylsulfuric acid ester salts, higher alkylethersulfuric acid ester salts, higher fatty acid amide sulfonic acid salts, higher alkylsulfosuccinic acid salts, alkylbenzenesulfonic acid salts, acylglutamic acid salts, higher alkylphosphoric acid salts, etc.; cationic surfactants such as higher alkyl quaternary ammonium salts, fatty amine salts, alkylpyridinium salts, etc.; amphoteric surfactants such as carboxybetaine, sulfobetaine, imidazoline derivatives, etc.; polyoxyethylene alkyl ether, polyoxyethylene fatty acid amide, sorbitan fatty acid esters, fatty acid alkanolamide, polyglycerine fatty acid ester, etc.

The percutaneous absorption promoting agent and the dermatologic preparation according to the present invention have an excellent percutaneous absorption promoting effect of a drug component, and further are percutaneous absorption promoters with a good safety and use feeling.

The present invention is described in more detail by referring to Examples, but the present invention is, of course, not limited to these Examples. In the following Examples, "%" represents "% by weight", unless otherwise specifically noted. (1)     Dexamethasone      0.025% (2)     Propylene glycol   8.0 (3)     Glycerine          5.0 (4)     Fluid paraffin     1.0 (5)     Diisopropyl adipate 3.0 (6)     Sodium dodecylsulfate 0.08 (7)     Dodecyldimethylamine oxide 0.16 (8)     Glycerine monofatty acid ester 1.5 (9)     Preservative       q.s. (10)    Clay mineral (bentonite) 6.0 (11)    Purified water     balance ______________________________________

To (5) were added (1), (4), (8) and (9) and these components were dissolved and mixed by heating to 70.degree. C. This was called composition (A). The components (6) and (7) were added to a part of (11) to be dissolved therein, followed further by an addition and mixing of the components (2) and (3). This was called composition (B). While composition (B) was stirred at a temperature maintained at 70.degree. C., composition (A) was gradually added to effect preliminary emulsification, followed by emulsification by a homomixer.

The resultant emulsion was added to a dispersion having added and dispersed (10) in the remainder of (11) under stirring, and cooled to obtain a cream. (1)    Dexamethasone      0.025% (2)    Propylene glycol   8.0 (3)    Glycerine          5.0 (4)    Fluid paraffin     1.0 (5)    Diisopropyl adipate 3.0 (6)    Glycerine monofatty acid ester 1.5 (7)    Preservative       q.s. (8)    Clay mineral (bentonite) 6.0 (9)    Purified water     balance ______________________________________

[Preparation Method]

According to Example 1-1.

For the creams prepared in Example 1-1 and Comparative Example 1-1, the vasoconstrictive action was compared.

More specifically, on the upper backs of 10 healthy human males, creams prepared in Example 1-1 and Comparative Example 1-1, and further creams of the above two kinds of creams not containing dexamethasone were respectively and randomly apportioned, applied by use of an adhesive plaster for patch test (produced by Torii Yakuhin), and plastered under sealing. After 4 hours, the adhesive plaster was peeled off, the sample removed, and Judgement was conducted after further standing for 4 hours. Judgement was conducted according to the standards by achromasia phenomenon accompanied with vasoconstrictive action of steroids as "remarkable achromasia phenomenon" (score 2), "clear achromasia phenomenon" (score 1), "faint achromasia phenomenon" (score 0.5), "no change" (score 0), and an average score was determined for each base.

The results are shown in Table 1-1. ______________________________________ Average score Base                 after 4 hours ______________________________________ Example              1.7 Comparative Example  1.0 System of Example from which 0 dexamethasone is removed System of Comparative Example 0 from which dexamethasone is removed ______________________________________

As apparent from Table 1-1, it can be understood that the cream of Example 1-1 had an excellent vasoconstrictive action. (1)     Indomethacin         1.0% (2)     Ethyl alcohol        50.0 (3)     Carboxyl vinyl polymer 1.2 (4)     Polyoxyethylene      1.5 (hereinafter called POE: 40 mole) hardened caster oil (5)     Sodium dodecylsulfate 0.5 (6)     Sodium dodecylphosphate 0.6 (7)     Sodium laurylisothionate 0.2 (8)     Dodecyldimethylamine oxide 1.14 (9)     Diethanolamide laurate 0.2 (10)    Diisopropanolamine   0.35 (11)    Purified water       balance ______________________________________

[Preparation Method]

After (5), (6), (7), (8) and (9) were dissolved in (11), (3) was dispersed in the solution. The dispersion was added to a solution of (1) and (4) added and dissolved in (2), followed by thorough mixing. Further, to this mixture was added (10) and the mixture was stirred and mixed to obtain a gel. (1)      Indomethacin    1.0% (2)      Ethyl alcohol   50.0 (3)      Carboxy vinyl polymer 1.2 (4)      POE hardened caster oil 1.5 (5)      Diisopropanolamine 0.35 (6)      Purified water  balance ______________________________________

[Preparation Method]

According to Example 1-2.

Commercially available ointment containing 1% indomethacin (gel-like external agent).

For the above gel bases, the pharmacological effects were examined and compared according to the carageenin edema inhibition test.

More specifically, using 5 Wooster-strain male rats 6 weeks of age, after birth as one group, first the right rear leg volume of the rat in each group was measured by a rat rear leg footpad edema volume measuring device KM-357 (produced by Natsume Seisakusho), and then 0.2 g of a sample was applied on the right rear leg of rat. Two hours later, 0.05 ml of 1% carageenin sodium salt was subscutaneously injected at the same site, and 3 hours after the carageenin sodium salt injection, the right rear leg volume was measured to calculate foot edema inhibition according to the following formula, with the difference in the right rear leg volume before coating of the sample being the foot edema volume. ##EQU1## wherein Vc and Vt represent average edema volumes of the control group (coated with no test sample), and the group coated with test sample, respectively.

The above test results are shown in Table 1-2. ______________________________________ Carageenin foot edema inhibition (%) ______________________________________ Example 1-2      53.9 Comparative Example 1-2 11.2 Comparative Example 1-3 8.5 ______________________________________

As apparent from the table, it can be understood that the gel base of Example had an excellent carageenin edema inhibition action. (1)     Hydroquinone      1.0% (2)     Sodium dodecylsulfate 0.2 (3)     Dodecyldimethylamine oxide 0.7 (4)     Purified water    balance ______________________________________

[Preparation Method]

After (2) and (3) were dissolved in (4), (1) was added and the mixture stirred and dissolved to provide a sample. (1)       Hydroquinone 1.0% (2)       Purified water balance ______________________________________

[Preparation Method]

According to Example 1-3. (1)       Hydroquinone 1.0 (2)       Urea        5.0 (3)       Purified water balance ______________________________________

[Preparation Method]

According to Example 1-3.

On the back skins of hairless mice, 3 mice in one group, 100 liter of a sample was plastered with Torii adhesive plaster for patch test (diameter: 1.6 cm). On the adhesive plaster was placed a sponge, which was further coated with a thin film of a rubber to which the adhesive plaster was adhered. After coating, each mouse was placed in a sealed vessel made of a plastic, with a delivery of air, and carbon dioxide discharged by breathing absorbed in a 50% methanolic solution of monoethanolamine.

After coating, the adhesive plaster at the coated portion was removed at 24 and 48 hours for measurement of the activity in the adhesive plaster. Next, the coated portion was subjected to stripping with cellophane tape for 8 times, and the activity in the corneum adhered to cellophane tape was measured. Then, animals were sacrificed, the skin at the coated portion peeled off, and the activity in the skin measured. The remaining whole body was homogenated by a blender with an addition of 30 g of 0.5N aqueous sodium hydroxide, and a certain amount of the homogenate sampled for a measurement of the activity. Also, fetus and urine discharged up to a predetermined time were recovered for a measurement of the activity.

Here, the sum of the amount discharged by breathing, the amounts of fetus and urine discharged, and the amount stored in the body was defined as the percutaneous absorption amount in body. The above test results are shown in Table 1-3. ______________________________________ Percutaneous absorp- tion amount in body ______________________________________ Example 1-3       28.8% Comparative Example 1-4 4.9 Comparative Example 1-5 4.6 ______________________________________ (1)     Dexamethasone       0.025% (2)     Propylene glycol    8.0 (3)     Glycerine           5.0 (4)     Fluid paraffin      1.0 (5)     Diisopropyl adipate 3.0 (6)     Lauric acid diethanolamide 0.6 (7)     N,N-dimethyl-N-lauryl-N- 0.3 carboxymethylammonium betaine (8)     Glycerine monofatty acid ester 1.5 (9)     Preservative        q.s. (10)    Clay mineral (bentonite) 6.0 (11)    Purified water      balance ______________________________________

[Preparation Method]

To (5) were added (1), (4), (8) and (9) and these components were dissolved and mixed by heating to 70.degree. C. This was called composition (A).

The components (6) and (7) are added to a part of (11) to be dissolved therein, followed further by an addition and mixing of the components (2) and (3). This was called composition (B).

While composition (B) was stirred at a temperature maintained at 70.degree. C., composition (A) was gradually added to effect preliminary emulsification, followed by emulsification by a homomixer.

The resultant emulsion was added to a dispersion having added and dispersed (10) in the remainder of (11) under stirring, and cooled to obtain a cream. (1)     Dexamethasone      0.025% (2)     Propylene glycol   8.0 (3)     Glycerine          5.0 (4)     Fluid paraffin     1.0 (5)     Diisopropyl adipate 3.0 (6)     Glycerine monofatty acid ester 1.5 (7)     Preservative       q.s. (8)     Clay mineral (bentonite) 6.0 (9)     Purified water     balance ______________________________________

[Preparation Method]

According to Example 2-1.

For the creams prepared in Example 2-1 and Comparative Example 2-1, the vasoconstrictive action was compared as in Test Example 1-1.

The results are shown in Table 2-1. ______________________________________ Average score Base                 after 4 hours ______________________________________ Example 2-1          1.7 Comparative Example 2-1 1.0 System of Example 2-1 from 0 which dexamethasone is removed System of Comparative Example 0 2-1 from which dexamethasone is removed ______________________________________

As apparent from Table 2-1, it can be understood that the cream of Example 2-1 have an excellent vasoconstrictive action. (1)      Indomethacin       1.0% (2)      Ethyl alcohol      50.0 (3)      Carboxyl vinyl polymer 1.2 (4)      Polyoxyethylene    1.5 (hereinafter called P.O.E.) hardened caster oil (5)      Lauryldimethylamine oxide 0.6 (6)      P.O.E. (15 mole) oleyl amine 0.8 (7)      N,N-dimethyl-N-lauryl-N- 1.0 sulfomethylammonium betaine (8)      Diethanolamine laurate 0.35 (9)      Diisopropanolamine 0.35 (10)     Purified water     balance ______________________________________

[Preparation Method]

After (5), (6), (7) and (8) were dissolved in (10), (3) was well dispersed in the solution. The dispersion was added to a solution of (1) and (4) added and dissolved in (2), followed by thorough mixing. Further, to this mixture was added (9) and the mixture stirred and mixed to obtain a gel. (1)      Indomethacin    1.0% (2)      Ethyl alcohol   50.0 (3)      Carboxyl vinyl polymer 1.2 (4)      POE hardened caster oil 1.5 (5)      Diisopropanolamine 0.35 (6)      Purified water  balance ______________________________________

[Preparation Method]

According to Example 2-2.

Commercially available ointment containing 1% indomethacin (gel-like external agent).

For the above gel-like bases, the pharmacological effects were examined and compared as in Test Example 1-2 according to the carageenin edema inhibition test.

The above test results are shown in Table 2-2. ______________________________________ Carageenin foot edema inhibition (%) ______________________________________ Example 2-2      50.8 Comparative Example 2-2 11.2 Comparative Example 2-3 8.5 ______________________________________

As apparent from the table, it can be understood that the gel base of Example had an excellent carageenin edema inhibition action. (1)   Hydroquinone            1.0% (2)   Coconut fatty acid diethanolamide 0.8 (3)   Dodecyldimethylamine oxide 0.5 (4)   Purified water          balance ______________________________________

[Preparation Method]

After (2) and (3) were dissolved in (4), (1) was added, and the mixture stirred and dissolved to provide a sample. (1)      Hydroquinone      1.0% (2)      Purified water    balance ______________________________________

[Preparation Method]

According to Example 2-3. (1)      Hydroquinone      1.0% (2)      Urea              5.0 (3)      Purified water    balance ______________________________________

[Preparation Method]

According to Example 2-3.

For the samples obtained above, the percutaneous absorption amounts were determined as in Test Example 1-3.

The above test results are shown in Table 2-3. ______________________________________ Percutaneous absorption amount ______________________________________ Example 2-3       26.8% Comparative Example 2-4 4.9 Comparative Example 2-5 4.6 ______________________________________ (after 48 hours) (1)     Dexamethasone        0.025% (2)     Propylene glycol     8.0 (3)     Glycerine            5.0 (4)     Fluid paraffin       1.0 (5)     Diisopropyl adipate  3.0 (6)     Sodium myristylsulfate 2.5 (7)     Sobitan monooleate   1.0 (8)     Glycerine monofatty acid ester 1.5 (9)     Preservative         q.s. (10)    Clay mineral (bentonite) 6.0 (11)    Purified water       balance ______________________________________

[Preparation Method]

To (5) were added (1), (4), (8) and (9) and these components were dissolved and mixed by heating to 70.degree. C. This was called composition (A). The components and (7) were added to a part of (11) to be dissolved therein, followed further by an addition and mixing of components (2) and (3). This was called composition (B). While composition (B) was stirred at a temperature maintained at 70.degree. C., composition (A) was gradually added to effect preliminary emulsification, followed by emulsification by a homomixer.

The resultant emulsion was added to a dispersion having added and dispersed (10) in the remainder of (11) under stirring, and cooled to obtain a cream. (1)     Dexamethasone        0.025% (2)     Propylene glycol     8.0 (3)     Glycerine            5.0 (4)     Fluid paraffin       1.0 (5)     Diisopropyl adipate  3.0 (6)     Glycerine monofatty acid ester 1.5 (7)     Preservative         q.s. (8)     Clay mineral (bentonite) 6.0 (9)     Purified water       balance ______________________________________

[Preparation Method]

According to Example 3-1.

For the creams prepared in Example 3-1 and Comparative Example 3-1, the vasoconstrictive action was compared as in Test Example 1-1.

The results are shown in Table 3-1. ______________________________________ Average score Base                after 4 hours ______________________________________ Example 3-1         1.4 Comparative Example 3-1 1.0 System of Example 3-1 from 0 which dexamethasone is removed System of Comparative Example 0 3-1 from which dexamethasone is removed ______________________________________

As apparent from the table, it can be understood that the cream of Example 3-1 had an excellent vasoconstrictive action. (1)     Indomethacin          1.0% (2)     Ethyl alcohol        50.0 (3)     Carboxyl vinyl polymer 1.2 (4)     Polyoxyethylene (40 mole 1.5 addition) hardened caster oil (5)     Sodium dodecylsulfate 0.7 (6)     Sodium monolaurylphosphate 0.6 (7)     Sodium laurylisothionate 0.7 (8)     POE sorbitan monostearate 2.3 (9)     Sucrose fatty acid ester 1.5 (10)    Diisopropanolamine    0.35 (11)    Purified water       balance ______________________________________

[Preparation Method]

After (5), (6), (7), (8) and (9) were dissolved in (11), (3) was dispersed in the solution. The dispersion was added to a solution of (1) and (4) added and dissolved in (2 ) , followed by thorough mixing. Further, to this mixture was added (10) and the mixture was stirred and mixed to obtain a gel. (1)     Indomethacin          1.0% (2)     Ethyl alcohol        50.0 (3)     Carboxyl vinyl polymer 1.2 (4)     Polyoxyethylene (40 mole 1.5 addition) hardened caster oil (5)     Diisopropanolamine    0.35 (6)     Purified water       balance ______________________________________

[Preparation Method]

According to Example 3-2.

Commercially available ointment containing 1% indomethacin (gel-like external agent).

For the above gel bases, the pharmacological effects were examined and compared as in Test Example 1-2 according to the carageenin edema inhibition test.

The above test results are shown in Table 3-2. ______________________________________ Carageenin foot edema inhibition (%) ______________________________________ Example 3-2      48.3 Comparative Example 3-2 11.2 Comparative Example 3-3 8.5 ______________________________________

As apparent from the table, it can be understood that the gel base of Example 3-2 had an excellent carageenin edema inhibition action. (1)     Hydroquinone         1.0% (2)     Sodium N-lauroyl glutamate 1.2 (3)     Polyoxyethylene (15 mole 1.6 addition) stearyl ether (4)     Purified water       balance ______________________________________

[Preparation Method]

After (2) and (3) were dissolved in (4), (1) was added and the mixture stirred and dissolved to provide a sample. (1)      Hydroquinone      1.0% (2)      Purified water    balance ______________________________________

[Preparation Method]

According to Example 3-3. (1)      Hydroquinone      1.0% (2)      Urea              5.0 (3)      Purified water    balance ______________________________________

[Preparation Method]

According to Example 3-3.

For the samples obtained above, the percutaneous absorption amounts were determined as in Test Example 1-3.

The above test results are shown in Table 3-3. ______________________________________ Percutaneous absorption amount ______________________________________ Example 3-3       21.8% Comparative Example 3-4 4.9 Comparative Example 3-5 4.6 ______________________________________ (after 48 hours) (1)     Dexamethasone        0.025% (2)     Propylene glycol     8.0 (3)     Glycerine            5.0 (4)     Fluid paraffin       1.0 (5)     Diisopropyl adipate  3.0 (6)     Fatty acid alkanolamide 1.8 (7)     Sorbitan monooleate  1.0 (8)     Glycerine monofatty acid ester 1.5 (9)     Preservative         q.s. (10)    Clay mineral (bentonite) 6.0 (11)    Purified water       balance ______________________________________

[Preparation Method]

To (5) were added (1), (4), (8) and (9) and these components were dissolved and mixed by heating to 70.degree. C. This was called composition (A). The components (6) and (7) were added to a part of (11) to be dissolved therein, followed further by an addition and mixing of components (2) and (3). This was called composition (B). While composition (B) was stirred at a temperature maintained at 70.degree. C., composition (A) was gradually added to effect preliminary emulsification, followed by emulsification by a homomixer.

The resultant emulsion was added to a dispersion having added and dispersed (10) in the remainder of (11) under stirring, and cooled to obtain a cream. (1)     Dexamethasone        0.025% (2)     Propylene glycol     8.0 (3)     Glycerine            5.0 (4)     Fluid paraffin       1.0 (5)     Diisopropyl adipate  3.0 (6)     Glycerine monofatty acid ester 1.5 (7)     Preservative         q.s. (8)     Clay mineral (bentonite) 6.0 (9)     Purified water       balance ______________________________________

[Preparation Method]

According to Example 4-1.

For the creams prepared in Example 4-1 and Comparative Example 4-1, the vasoconstrictive action was compared as in Test Example 1-1.

The results are shown in Table 4-1. ______________________________________ Average score Base                after 4 hours ______________________________________ Example 4-1         1.5 Comparative Example 4-1 1.0 System of Example 4-1 from 0 which dexamethasone is removed System of Comparative Example 0 4-1 from which dexamethasone is removed ______________________________________

As apparent from the table, it can be understood that the cream of Example 4-1 had an excellent vasoconstrictive action. (1)     Indomethacin          1.0% (2)     Ethyl alcohol        50.0 (3)     Carboxyl vinyl polymer 1.2 (4)     Polyoxyethylene (40 mole 1.5 addition) hardened caster oil (5)     Diethanolamide laurate 1.5 (6)     Lauryldimethylamine oxide 1.0 (7)     Lauryl betaine        0.5 (8)     POE sorbitan monostearate 1.14 (9)     Sucrose fatty acid ester 0.2 (10)    Diisopropanolamine    0.35 (11)    Purified water       balance ______________________________________

[Preparation Method]

After (5), (6), (7), (8) and (9) were dissolved in (11), (3) was dispersed in the solution. The dispersion was added to a solution (1) and (4) added and dissolved in (2), followed by thorough mixing. Further, to this mixture was added (10) and the mixture stirred and mixed to obtain a gel. (1)     Indomethacin          1.0% (2)     Ethyl alcohol        50.0 (3)     Carboxy vinyl polymer 1.2 (4)     Polyoxyethylene (40 mole 1.5 addition) hardened caster oil (5)     Diisopropanolamine    0.35 (6)     Purified water       balance ______________________________________

[Preparation Method]

According to Example 4-2.

Commercially available ointment containing 1% indomethacin (gel-like external agent).

For the above gel bases, the pharmacological effects were examined and compared as in Test Example 1-2 according to the carageenin edema inhibition test.

The above test results are shown in Table 4-2. ______________________________________ Carageenin foot edema inhibition (%) ______________________________________ Example 4-2      49.1 Comparative Example 4-2 11.2 Comparative Example 4-3 8.5 ______________________________________

As apparent from the table, it can be understood that the gel base of Example 4-2 had an excellent carageenin edema inhibition action. (1)     Hydroquinone         1.0% (2)     Distearyldimethyl ammonium 0.5 chloride (3)     Triglycerine monolaurate 1.5 (4)     Purified water       balance ______________________________________

[Preparation Method]

After (2) and (3) were dissolved in (4), (1) was added and the mixture stirred and dissolved to provide a sample. (1)      Hydroquinone      1.0% (2)      Purified water    balance ______________________________________

[Preparation Method]

According to Example 4-3. (1)      Hydroquinone      1.0% (2)      Urea              5.0 (3)      Purified water    balance ______________________________________

[Preparation Method]

According to Example 4-3.

For the samples obtained above, the percutaneous absorption amounts were determined as in Test Example 1-3.

The above test results are shown in Table 4-3. ______________________________________ Percutaneous absorption amount ______________________________________ Example 4-3       23.7% Comparative Example 4-4 4.9 Comparative Example 4-5 4.6 ______________________________________ (after 48 hours)

A drug permeability test was conducted for amine oxide, which is the product of the present invention.

Pharmaceutical samples comprising the following composition were prepared. (1)      Hydroquinone       1.0% (2)      Test substance     0.1% (3)      Ethanol           20.0 (4)      Purified water    balance ______________________________________

[Preparation Method]

After (1) and (2) were dissolved in (3), (4) was added and mixed to provide a sample.

Tests were conducted for the following test substances. (1)      Hydroquinone       1.0% (2)      Ethanol           20.0 (3)      Purified water    balance ______________________________________

[Preparation Method]

According to Examples 5-1-5-5.

For an evaluation of the percutaneous absorption promoting effect of a drug with the test substance, a drug permeability test was conducted by in vitro diffusion cell, using the enucleated skin of a hairless mouse. As the diffusion cell device, a vertical film type 2-compartment cell with a diffusion area of 2 cm.sup.2 was employed. The whole skin layer at the back of a 10 to 15 weeks old male hairless mouse was enucleated and mounted on a diffusion cell. In the cell compartment on the medicament sample side, 2 ml of a medicament sample was placed, and 2 ml of a phosphate buffer phisiological saline (pH 7.2) was placed in the cell compartment on the receptor side, and the whole cell maintained at 32.degree. C. in a thermostat tank while gently stirring both phases. After 24 hours, the receptor solution was sampled and the amount of the drug permeated by high performance chromatography to the receptor side quantitated. The results are represented in drug permeability (%). The results are shown in Table 5-1. ______________________________________ Drug Test substance permeability Effect ______________________________________ Example 5-1 Dimethylstearylamine 44.0 oxide Example 5-2 Dimethylbehenylamine 28.6 oxide Example 5-3 Dihydroxyethylstearyl- 30.5 amine oxide Example 5-4 Dimethyllaurylamine oxide 9.4 Example 5-5 Dimethylmyristylamine 11.8 oxide Comparative --               2.1        -- Example 5-1 ______________________________________

As apparent from the table, the percutaneous absorption promoting agent of the present invention had an excellent skin permeability promoting effect of a drug, and particularly, it can be understood that insoluble or slightly soluble amine oxides had excellent effects. (1)    [.sup.14 C]Hydroquinone 1.0% (2)    Dimethylstearylamine oxide 0.1 (3)    Ethanol               20.0 (4)    Purified water        balance ______________________________________

[Preparation Method]

After (1) and (2) were dissolved in (3), (4) was added and mixed to provide a sample. (1)      [.sup.14 C]Hydroquinone 1.0% (2)      Ethanol           20.0 (3)      Purified water    balance ______________________________________

[Preparation Method]

According to Example 5-6. (1) [.sup.14 C]Hydroquinone 1.0% (2) Urea          5.0 (3) Ethanol       20.0 (4) Purified water balance ______________________________________

[Preparation Method]

After (1) was dissolved in (3), a solution of (2) dissolved in (4) was added and mixed to provide a sample.

On the back skin of hairless mice, 3 mice in one group, 100 .mu.l of a sample was plastered with a Torii adhesive plaster for patch test (diameter: 1.6 cm). On the adhesive plaster was placed a sponge, which was further coated with a thin film of a rubber to which the adhesive plaster was adhered. After coating, the mouse was placed in a sealed vessel made of a plastic, with a delivery of air, and carbon dioxide discharged by breathing was absorbed in a 50% methanolic solution of monoethanolamine.

After coating, the adhesive plaster at the coated portion was removed at 24 and 48 hours for measurement of the radioactivity in the adhesive plaster. Next, the coated portion was subjected to stripping with cellophane tape for 8 times, and the radioactivity in the corneum adhered to cellophane tape measured. Then, the animals were sacrificed, the skin at the coated portion peeled off, and the radioactivity in the skin measured. The remaining whole body was homogenated by a blender with an addition of 30 g of 0.5N aqueous sodium hydroxide, and a certain amount of the homogenate was sampled for measurement of the radioactivity. Also, fetus and urine discharged up to a predetermined time were recovered for measurement of the radioactivity. Here, the sum of the amount discharged by breathing, the amounts of fetus and urine discharged, and the amount stored in the body was defined as the percutaneous absorption amount in the body. The above test results are shown in Table 5-2. ______________________________________ Percutaneous absorption amount in body ______________________________________ Example 5-6       35.5% Comparative Example 5-2 4.1 Comparative Example 5-3 4.9 (after 48 hours) ______________________________________

As apparent from the table, it can be understood that the percutaneous absorption promoting agent of the present invention had an excellent effect of absorption promotion of a drug. (1)    Dexamethasone      0.025% (2)    Propylene glycol   8.0 (3)    Glycerine          5.0 (4)    Fluid paraffin     1.0 (5)    Diisopropyl adipate 3.0 (6)    Dimethylstearylamine oxide 5.0 (7)    Glycerine monofatty acid ester 1.5 (8)    Preservative       q.s. (9)    Clay mineral (bentonite) 6.0 (10)   Purified water     balance ______________________________________

[Preparation Method]

To (6) were added (1), (4), (5), (7) and (8) and these components were dissolved and mixed by heating to 70.degree. C. This was called composition (A). The components (2) and (3) were added to a part of (10). This was called composition (B). While composition (B) was stirred at a temperature maintained at 70.degree. C., composition (A) was gradually added to effect preliminary emulsification, followed by emulsification by a homomixer. The resultant emulsion was added to a dispersion having added and dispersed (9) in the remainder of (10) under stirring, and cooled to obtain a cream. (1) Dexamethasone     0.025% (2) Propylene glycol  8.0 (3) Glycerine         5.0 (4) Fluid paraffin    1.0 (5) Diisopropyl adipate 3.0 (6) Glycerine monofatty acid ester 1.5 (7) Preservative      q.s. (8) Clay mineral (bentonite) 6.0 (9) Purified water    balance ______________________________________

[Preparation Method]

According to Example 5-7.

For the creams prepared in Example and Comparative Example, the vasoconstrictive action was compared as in Test Example 1-1.

The results are shown in Table 5-3. ______________________________________ Average score Base                after 4 hours ______________________________________ Example 5-7         1.8 Comparative Example 5-4 0.9 System of Example 5-7 from 0 which dexamethasone is removed System of Comparative Example 0 5-4 from which dexamethasone is removed ______________________________________

As apparent from the table, it can be understood that the cream of Example 5-7 had an excellent vasoconstrictive action. (1)    Indomethacin      1.0% (2)    Ethyl alcohol     50.0 (3)    Carboxy vinyl polymer 1.2 (4)    Polyoxyethylene (40) 1.5 hardened caster oil (5)    Dimethylbehenylamine oxide 1.0 (6)    Diisopropanolamine 0.35 (7)    Purified water    balance ______________________________________

[Preparation Method]

After (1), (4) and (5) were dissolved in (2), (3) dissolved in (7) was added, followed by thorough mixing. Further, to this mixture was added (6) and the mixture stirred and mixed to obtain a gel. (1)     Indomethacin    1.0% (2)     Ethyl alcohol   50.0 (3)     Carboxy vinyl polymer 1.2 (4)     Polyoxyethylene (40) 1.5 hardened caster oil (5)     Diisopropanolamine 0.35 (6)     Purified water  balance ______________________________________

[Preparation Method]

According to Example 5-8.

Commercially available ointment containing 1% indomethacin (gel-like external agent).

For the above gel bases, the pharmacological effects were examined and compared as in Test Example 1-2 according to the carageenin edema inhibition test.

The above test results are shown in Table 5-4. ______________________________________ Carageenin foot edema inhibition (%) ______________________________________ Example 5-8       56.1 Comparative Example 5-5 12.0 Comparative Example 5-6 10.8 ______________________________________

As apparent from the table, it can be understood that the gel base of Example 5-8 had an excellent carageenin edema inhibition action.

The percutaneous absorption promotion effect of drugs with the test substances shown in Table 6-1 were evaluated as in Test Example 5-1. ______________________________________ Drug permea- bility Test substance        Drug      (%) ______________________________________ Example Sodium dodecylsulfate 0.2%   Arbutin 39% 6-1                           0.3% Dodecylaminoacetic 0.5% acid betaine Example Sodium dodecylsulfate 0.2%   Minoxidyl 32% 6-2                           0.3% Dodecylaminoacetic 0.5% acid betaine Example Sodium dodecylsulfate 0.2%   Kojic acid 40% 6-3                           0.3% Dodecylaminoacetic 0.5% acid betaine Example Laurylimidazolinium- 0.1%   Arbutin 27% 6-4     betaine               0.3% Lauryldiethanolamide 0.5% Example Stearyldimethylamine 0.5%   Arbutin 34% 6-5     oxide                 0.3% Compara-                      Arbutin  1% ative                         0.3% Example 6-1 ______________________________________

In the table, numerical values (%) in the column of test substance and drug show the concentrations in aqueous solution.

As apparent from the results in the above table, it can be understood that the test substances (percutaneous absorption promoting agent) of Examples 6-1-6-5 according to the present invention have a remarkably excellent skin permeability promoting effect of drugs.

## Claims

1. In a dermatological preparation containing a dermatological base, a drug, and a percutaneous absorption promoting agent, the improvement wherein the percutaneous absorption promoting agent comprises (A) at least one anionic surfactant and (B) at least one surfactant having a nitrogen atom in the molecule other than anionic and cationic surfactants as the active ingredients, the mole ratio of the components (A)/(B) being 20/1 to 1/20.

2. A dermatological preparation as claimed in claim 1, wherein the ratio (A)/(B) is 10/1 to 1/10.

3. In a dermatological preparation containing a dermatological base, a drug, and a percutaneous absorption promoting agent, the improvement wherein the percutaneous absorption promoting agent comprises (A) at least one surfactant selected from the group consisting of amphoteric surfactants and semi-polar surfactants and (B) at least one nonionic surfactant having a nitrogen atom in the molecule as the active ingredients, the mole ratio of the components (A)/(B) being 20/1 to 1/20.

4. A dermatological preparation as claimed in claim 3, wherein the ratio (A)/(B) is 10/1 to 1/10.

5. A preparation according to claim 1, wherein A comprises sodium dodecylsulfate and B comprises dodecylaminoacetic acid betaine.

6. A dermatological preparation according to claim 1, wherein (A) is selected from the group consisting of a carboxylic acid, a sulfonic acid, a sulfuric acid ester and a phosphoric acid ester or salt thereof, and (B) is selected from the group consisting of a fatty acid alkanolamide, polyoxyethylene fatty acid amide, ester of an alkanolamine, polyoxyethylene alkylamine, a carboxyl betaine, an imidazoline derivative, an aminocarboxylic acid salt, a sulfobetaine, an aminobetaine and an amine oxide.

7. A dermatological preparation according to claim 1, wherein (A) is selected from the group consisting of a fatty acid soap, an acyl glutamate, sulfosuccinic acid, ether sulfonic acid salt, a amidosulfuric acid salt and alkylphosphoric acid salt, and (B) is selected from the group consisting of a fatty acid alkanolamide, polyoxyethylene fatty acid amide, ester of an alkanolamine, polyoxyethylene alkylamine, N,N-dimethyl-N-lauryl-N-carboxyl-methylammonium betaine, N,N-dimethyl-N-oleyl-N-carboxymethylammonium betaine, 2-lauryl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, 2-lauryl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine, N-cocoalkyl-.beta.-aminopropionic acid sodium salt, N-cocoalkyl-.beta.-iminodipropionic acid disodium salt, sulfobetaine, aminobetaine, lauryldimethylamine oxide, stearyldimethylamine oxide, bis-(2-hydoxyethyl)laurylamine oxide, an N-acylsulfonic acid salt and an alkyl sulfonic acid salt.

8. A dermatological preparation according to claim 3, wherein (A) is selected from the group consisting of a carboxyl betaine, an imidazoline derivative, an aminocarboxylic acid salt, a sulfobetaine, an aminobetaine and an amine oxide, and (B) is a fatty acid alkanolamide.

9. A dermatological preparation according to claim 3, wherein (A) is selected from the group consisting of N,N-dimethyl-N-lauryl-N-carboxyl-methylammonium betaine, N,N-dimethyl-N-oleyl-N-carboxymethyl ammonium betaine, 2-lauryl-N-carboxymethyl-N-hydroxyethyl-imidazolinium betaine, 2-lauryl-N-carboxymethyl-N-hydroxyethyl-imidazolinium betaine, N-cocoalkyl-.beta.-aminopropionic acid sodium salt, N-cocoalkyl-.beta.-iminodipropionic acid disodium salt, sulfobetaine, aminobetaine, lauryldimethylamine oxide, stearyldimethylamine oxide and bis-(2-hydroxyethyl)laurylamine oxide, and (B) is a fatty acid alkanolamide.

10. A dermatological preparation according to claim 6, wherein (B) includes a chain of 8 to 24 carbon atoms.

11. In a dermatological preparation containing a dermatological base, a drug, and a percutaneous absorption promoting agent, the improvement wherein the percutaneous absorption promoting agent consists essentially of an amine oxide selected from the group consisting of: by the formula (I): ##STR4## wherein R.sub.1, R.sup.2 and R.sup.3 each represents a straight or branched alkyl group or alkenyl group having 1 to 24 carbon atoms, and at least one of R.sub.1, R.sub.2 and R.sub.3 represents a straight or branched alkyl group or alkenyl group having 16 to 24 carbon atoms; ##STR5## wherein R represents a straight or branched alkyl group or alkenyl group having 8 to 24 carbon atoms; and (III): ##STR6## wherein R represents a straight or branched alkyl group or alkenyl group having 8 to 24 carbon atoms, and n represents an integer from 1 to 5.

12. A dermatological preparation according to claim 11, wherein the amine oxide has a stearyl radical.

13. A dermatological preparation according to claim 11 wherein the amine oxide has a behenyl radical.