PHARMACEUTICAL COMPOSITION FOR PERCUTANEOUS DRUG ABSORPTION AND PERCUTANEOUS DRUG ABSORPTION PROMOTER

Abstract: A pharmaceutical composition for percutaneous drug absorption which comprises 5-isopropyl 3-methyl 2-cyano-6-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-­ 3,5-dicarboxylate,and ethanol and/or an unsaturated higher fatty acid.

Description: The present invention relates to a pharmaceutical composition for percutaneous drug absorption which comprises 5-isopropyl 3-methyl 2-cyano-6-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, ethanol and an unsaturated higher fatty acid for combating diseases, in particular coronary angiopathy or hypertension, to processes for preparing the same and to the use of a mixture of ethanol and an unsaturated higher fatty acid for promoting the percutaneous absorption of 5-isopropyl 3-methyl 2-cyano-6-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate. The 5-isopropyl 3-methyl 2-cyano-6-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate used according to the present invention as an active ingredient and the percutaneous absorption of which is to be promoted in accordance with the present invention has the following chemical formula: The dihydropyridine compound (I) has vasodilating activity and is useful in the treatment of various diseases, in particular of coronary angiopathy, such as angina pectoris or myocardial infarction, or hypertension. This dihydropyridine compound includes two optically active isomers, namely dextro-rotatory and levo-rotatory ones, resulting from the presence of an asymmetric carbon atom in the 4-position of the dihydropyridine ring and mixtures thereof. In particular, the optically inactive racemic mixture is known by the generic name "nilvadipine". The dihydropyridine compound (I) to be used as the chief ingredient in accordance with the invention is sparingly soluble in water and, as such, can be absorbed percutaneously only to a slight extent. It has been thought difficult to attain an effective drug concentration in the blood by percutaneous administration. On the other hand, the conventional oral preparations are still more or less unsatisfactory from the sustained action viewpoint although they are satisfactory in promptness in action. Accordingly, a preparation for percutaneous administration which can release the drug sustainedly has been waited for. From DE-A-29 40 833 nilvadipine is already known which can be recrystallized in ethanol. Drug compositions comprising nilvadipine and a percutaneous absorption promotor such as 1-alkylazacycloalkan-2-one for percutaneous use are already known from "Patent Abstracts of Japan", vol. 10, no. 185 (C-357) (2241), June 27, 1986. From EP-A-294 601 which belongs to the prior art according to article 54(3) and (4) EPC transdermal compositions are already known which comprise nilvadipine and ethanol as a flux enhancer. It is also well known from "Manufacturing Chemist", vol. 58, no. 4, 1987, pages 49-51, that oleic acid can be used as a percutaneous absorption promotor because of its penetration enhancing properties. Since, however, it is difficult to attain an effective concentration of the dihydropyridine compound (I) as the chief ingredient in the blood by percutaneous administration, the object of the present invention is to find a preparation for percutaneous administration which can release the dihydropyridine compound (I) in a higher extent and sustainedly. As a result of their intensive investigations made in an attempt to overcome the above problems, the inventors of this invention found that ethanol and an unsaturated higher fatty acid can markedly promote the percutaneous absorption of the dihydropyridine compound (I). This finding has led to completion of this invention. Accordingly, one aspect of this invention is a pharmaceutical composition for percutaneous drug absorption which comprises the dihydropyridine compound (I) as the chief ingredient, and ethanol and an unsaturated higher fatty acid as a percutaneous absorption promoter and which may contain, as optional component(s), (an)other percutaneous absorption promoter(s) for increasing the absorbability of said compound further. Another aspect of this invention is the use of ethanol and an unsaturated higher fatty acid as percutaneous drug absorption promoter which is capable of markedly promoting the percutaneous absorption of the dihydropyridine compound (I). Subject-matter of the present invention is according to a first aspect a pharmaceutical composition for percutaneous drug absorption which comprises 5-isopropyl 3-methyl 2-cyano-6-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, ethanol and an unsaturated higher fatty acid. The pharmaceutical composition of the present invention is suitable for combating diseases, in particular for combating coronary angiopathy or hypertension. The active ingredient used according to the present invention is 5-isopropyl 3-methyl 2-cyano-6-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate preferably as a dextro-rotatory compound or as a racemic compound (generally called "nilvadipine"). The contant of the active ingredient is preferably 0.01 to 20% by weight, the content of the ethanol is preferably 5 to 95% by weight and the content of the unsaturated higher fatty acid is preferably 0.1 to 40% by weight of the composition. As the unsaturated fatty acid oleic acid is preferably used. The pharmaceutical composition of the present invention is preferably formulated in the form of a patch or in the form of a tape-form preparation. According to a further aspect the subject-matter of the present invention is also a process for preparing the pharmaceutical composition as defind above which comprises 5-isopropyl 3-methyl 2-cyano-6-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, ethanol, an unsaturated higher fatty acid and a base or a process which comprises 1) spreading a drug-free sustained release matrix containing ethanol and an unsaturated higher fatty acid over a support, 2) covering the said matrix with an absorption promoter release control membrane, and then 3) coating the absorption promoter release control membrane with a base containing 5-isopropyl 3-methyl 2-cyano-6-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate. Further subject-matters of the present invention are the use of nilvadipine, ethanol and an unsaturated higher fatty acid for the manufacture of a medicament for combating coronary angiopathy or hypertension and the use of a mixture of ethanol and an unsaturated fatty acid for promoting the percutaneous absorption of 5-isopropyl 3-methyl 2-cyano-6-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate. The present invention is further illustrated in the following by making reference to the accompanying drawings wherein: Fig. 1 is a sectional view schematically illustrating a patch preparation the drug release from which is controlled by means of a sustained release matrix; Fig. 2 is a sectional view shcematically illustrating a patch preparation the drug release from which is controlled by means of a sustained release matrix and which is further provided with an adhesive layer; Fig. 3 is a sectional view schematically illustrating a tape preparation; Fig. 4 is a sectional view schematically illustrating a patch preparation, wherein the drug migration is controlled through membrane permeation; Fig. 5 is a sectional view schematically illustrating a patch preparation, wherein the drug migration is controlled through membrane permeation and wherein said preparation is further provided with an adhesive layer; and Fig. 6 is a sectional view schematically illustrating a patch preparation, wherein the adhesive layer contains the chief ingredient and wherein the release of absorption promoter from the sustained release matrix, which is free of the chief ingredient, is controlled through membrane permeation. In the figures, the reference numeral (1) indicates a support member, (2) a drug-containing, sustained release matrix, (3) an adhesive layer, (4) a drug-containing adhesive layer, (5) an absorption promoter release-controlling membrane or film, and (6) a drug-free sustained release matrix. The unsaturated higher fatty acid to be used together with ethanol as the percutaneous absorption promoter in the pharmaceutical composition for percutaneous drug absorption in accordance with the present invention are the straight-chain or branched-chain aliphatic carboxylic acids containing 10 to 26 carbon atoms and 1 to 5 unsaturated bond(s), for example palmitolic acid, oleic acid, ricinolic acid, linolic acid, linoleic acid and eleostearic acid. Preferred among them are straight-chain aliphatic carboxylic acids containing 14 to 22 carbon atoms and 1 to 3 unsaturated bonds. Particularly preferred is oleic acid. As percutaneous absorption promoter(s) which is(are) other than ethanol or the unsaturated higher fatty acids and which can be added as optional component(s) to the pharmaceutical composition for percutaneous drug absorption according to the invention, there may be mentioned, for example, fatty acid esters, such as diethyl sebacate and isopropyl myristate, phospholipids, such as lecithin, mono-, di- or triglycerides, other nonionic surfactants, sulfonic acid esters, pyrrolidone and derivatives thereof. The pharmaceutical composition for percutaneous drug absorption according to the invention can be produced by a conventional method. Thus, the base for use in preparing said pharmaceutical composition may be any base which is dermatocompatible or dermatologically acceptable and at the same time compatible with the dihydropyridine compound (I) and ethanol and an unsaturated higher fatty acid without unfavorably affecting the dissolution, diffusion and other behaviors of the chief ingredient in said pharmaceutical composition. Such base includes water, room temperature-curable or thermosetting silicone polymers (e.g. silicone elastomers, hydrogels obtained from water-soluble macro-molecules or hydrogelating agent [e.g. agar, gelatin, carrageenan, chitosan, agarose, konnyaku, polyvinyl alcohol, polyvinylpyrrolidone, poly(2-hydroxyethyl methacrylate), hydroxypropylmethylcellulose, carboxymethylcellulose, hydroxypropylcellulose (e.g. hydroxypropylcellulose-H, hydroxyethylcellulose], products of gelation or liquid paraffin and triglycerides with lecithin or ethylcellulose. In said pharmaceutical composition containing ethanol, water is preferably used as a base and it is preferable to add thereto a hydrogel or hydrogelating agent such as mentioned above for gelation. Said base may contain a hydrophilic solvent or a hydrophobic solvent as a release aid for the active ingredient. As such hydrophilic solvent, there may be mentioned, for example, polyhydric alcohols such as propylene glycol, polyethylene glycol (e.g. polyethylene glycol 400, polyethylene glycol 4,000) and glycerin, and mixtures of these. As said hydrophobic solvent, there may be mentioned medium-chain fatty acid glycerides such as Panacete® and Miglyol®, liquid paraffin, and mixtures of these, among others. With said pharmaceutical composition, the rate of percutaneous absorption of the chief ingredient can be controlled, for example by dispersing the chief ingredient in an appropriate dermatocompatible sustained release matrix base, so that the diffusion of the chief ingredient in the base can serve as a percutaneous absorption rate-determining factor. As such dermatocompatible base, there may be mentioned those dermatocompatible basis mentioned above. The rate of release of the chief ingredient from the base can be optionally controlled by adding any of the above-mentioned hydrophilic or hydrophobic solvents to said base as necessary. The pharmaceutical composition for percutaneous drug absorption according to the invention can be administered in various dosage forms. When the pharmaceutical composition is to have the form of patches, said composition is spread over a support member (made of cloth or aluminum, for instance) (cf. Fig. 1) and, if necessary, an adhesive layer is provided (cf. Fig. 2). For producing adhesive tapes, the pharmaceutical composition according to the invention is mixed with an appropriate adhesive mass and the mixture is applied to an appropriate support member (cf. Fig. 3). In this case, the adhesive mass may be any adhesive mass usable in preparing ordinary adhesive tapes for medical use and can be selected depending on the desired rate of the drug release, for example from among silicone adhesives (e.g. Corning's 355 Medical Adhesive), rubber-based adhesives (e.g. Japan Synthetic Rubber's JSR0585), acrylic adhesives (e.g. Japan Acrylic Chemical's Primal N580S, and Nippon Junyaku's ST811). The pharmaceutical composition for percutaneous drug absorption according to the invention may also be made up into ointments for ordinary use, such as Macrogol ointments, FAPG ointments, hydrophilic ointments, absorptive ointments, and Carbopol gel ointments. In this case, for providing sustained release property, controlling drug absorption and preventing adherence to clothes, it is also possible to fill the composition in an appropriate container and attach the container to the skin so that said composition can come into contact therewith or to coat a support member (as in the case of tape preparations) with said composition to a certain thickness and apply the whole to the skin so that said composition can come into contact therewith. Furthermore, the pharamceutical composition for percutaneous drug absorption according to the invention can be made up into patches, for example by spreading said composition over an appropriate support member (made of aluminum, for instance) and, if necessary, sealing with an absorption promoter release-controlling film such as an ethylene-vinyl acetate copolymer (EVA) film (cf. Fig. 4), and furthermore, if necessary, providing an adhesive layer (cf. Fig. 5). With these patches, drug absorption can be controlled by interposing such absorption promoter release controlling film or membrane between said pharmaceutical composition or adhesive layer and the skin so that an effective blood concentration of the chief ingredient can be maintained for a prolonged period of time. The rate of drug absorption can be controlled as desired by adequately modifying the thickness of said absorption promoter release controlling film and/or the composition of the EVA film. Furthermore, the chief ingredient and/or the above-mentioned absorption promoter may be added to the adhesive layer as necessary so that the percutaneous absorbability can be increased and/or the absorption of the chief ingredient can be maintained. In cases where the pharmaceutical composition for percutaneous drug absorption is made up into patches, it is not always necessary that the chief ingredient and absorption promoter be present in the same layer. Thus, for example, patches may be prepared by spreading a dermatocompatible sustained release matrix free of the chief ingredient over a support member, then sealing with an absorption promoter release controlling film and further providing thereon an adhesive layer containing the chief ingredient (cf. Fig. 6). The pharmaceutical composition for percutaneous drug absorption according to the inention may be made up into any other dosage forms in which the chief ingredient can be absorbed percutaneously. In the pharmaceutical composition comprising the chief ingredient, ethanol and an unsaturated higher fatty acid, the content ratio among the chief ingredient, ethanol and the unsaturated higher fatty acid is not particularly limited. Preferably, however, their contents should preferably be 0.01 to 20% by weight, 5 to 95% by weight and 0.1 to 40% by weight, respectively, more preferably 0.1 to 10% by weight, 10 to 80% by weight and 1 to 30% by weight, respectively, based on the total amount of this composition. The following examples are further illustrative of the present invention Example 1 Nilvadipine 5% by weight Oleic acid 10% by weight Ethanol 49.8% weight Water 33.2% by weight HPC-H 2% by weight Nilvadipine and oleic acid were added to ethanol and the mixture was stirred. Water and HPC-H were, then, added to the mixture and the mixture was stirred, whereby a suspension gel was obtained. Example 2 Nilvadipine 1% by weight Oleic acid 10% by weight Ethanol 52.2% by weight Water 34.8% by weight HPC-H 2% by weight A solution gel was obtained by proceeding in the same manner as in Example 1. Example 3 5-Isopropyl 3-methyl (+)-2-cyano-6-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate 5% by weight Oleic acid 10% by weight Ethanol 49.8% by weight Water 33.2% by weight HPC-H 2% by weight A solution gel was obtained by proceeding in the same manner as in Example 1. Example 4 The suspension gel obtained in Example 1 was spread over a support member made of aluminum in an amount of 40.2 mg per square centimeter. The gel layer was covered with an EVA film (vinyl acetate content 14%, thickness 50 µm). After heat sealing, there was obtained a patch preparation. Example 5 A patch preparation was produced by using the solution gel obtained in Example 3 and following the procedure of Example 4. Example 6 Nilvadipine 5% by weight Oleic acid 25% by weight Ethanol 10% by weight PEG 400 31.5% by weight PEG 4,000 28.5% by weight PEG 400 and PEG 4,000 were melted by heating at 65°C on a water bath, nilvadipine was added to the melt for dissolution therein, oleic acid and ethanol were further admixed with the solution, and the temperature was lowered gradually while the mixture was stirred well until it became rigid. Thus was obtained a pharmaceutical composition. Example 7 A patch preparation was produced by using the solution gel obtained in Example 2 and an EVA film (vinyl acetate content 14%, thickness 50 µm) and following the procedure of Example 4. In this example, however, the gel was spread over the aluminum support in an amount of 38.3 mg per square centimeter. Example 8 A patch preparation like that obtained in Example 7 was produced by using a 30-µm-thick EVA film having a vinyl acetate content of 14%. Example 9 A patch preparation was produced by further forming an acrylic adhesive layer on the EVA film of the patch preparation produced in Example 8. The adhesive layer was prepared from the following components: Nilvadipine 10 by weight Oleic acid 20 by weight ST811 70 by weight Ethyl acetate 300 by weight Nilvadipine, oleic acid and ST811 were dissolved in ethyl acetate. The adhesive mass thus obtained was applied to a release paper by means of a knife coater to a thickness after drying of 100 µm and the coat layer was dried. Example 10 Nilvadipine 1% by weight Oleic acid 10% by weight Ethanol 52.2% by weight PEG 400 5% by weight Water 29.8% by weight HPC-H 2% by weight Nilvadipine and oleic acid were dissolved in ethanol and PEG 400 with stirring. Water and HPC-H were added to the solution and the mixture was stirred, whereby a solution gel was obtained. Example 11 5-Isopropyl 3-methyl (+)-2-cyano-6-metyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate 5% by weight Oleic acid 10% by weight Ethanol 49.8% by weight PEG 400 5% by weight Water 28.2% by weight HPC-H 2% by weight A solution gel was obtained by proceeding in the same manner as in Example 10. Example 12 The solution gel obtained in Example 10 was spread over an aluminum support in an amount of 38.3 mg per square centimeter. The gel layer was then covered with an EVA film (vinyl acetate content 14%, thickness 30 µm), followed by heat sealing. Thus was produced a patch preparation. Example 13 A patch preparation was produced by using the solution gel obtained in Example 11 and following the treatment procedure of Example 12. The gel was applied to the aluminum support in an amount of 40.2 mg per square centimeter. Example 14 Nilvadipine 1% by weight Oleic acid 8% by weight Ethanol 53.4% by weight PEG 400 5% by height Water 30.6% by weight HPC-H 2% by weight Nilvadipine and oleic acid were dissolved in ethanol and PEG 400 with stirring. After further addition of water and HPC-H to the solutioh, the mixture was stirred to give a solution gel. Example 15 5-Isopropyl 3-methyl (+)-2-cyano-6-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate 5% by weight Oleic acid 8% by weight Ethanol 51% by weight PEG 400 5% by weight Water 29% by weight HPC-H 2% by weight A solution gel was obtained by proceeding in the same manner as in Example 14. Example 16 The solution gel obtained in Example 14 was spread over an aluminum support in an amount of 37.45 mg per square centimeter. The gel layer was covered with an EVA film (vinyl acetate content 14%, thickness 30 µm), followed by heat sealing. A patch preparation was thus produced. Example 17 A patch preparation was produced by using the solution gel obtained in Example 15 and following the procedure of Example 16. In this example, however, the gel was applied to the aluminum support in an amount of 39.22 mg per square centimeter. Comparative Example 1 Nilvadipine 5 by weight Water 100 by weight Water was added to nilvadipine and the mixture was stirred to give a suspension. Comparative Example 2 Nilvadipine 5.0% by weight PEG 400 54.3% by weight PEG 4,000 40.7% by weight Nilvadipine was added to and dissolved in PEG 400 and PEG 4,000 which had been melted by heating at 65°C on a water bath. While the temperature was lowered gradually, the mixture was stirred well until it became rigid. Comparative Example 3 Nilvadipine 10 parts by weight ST811 90 parts by weight Ethyl acetate 300 parts by weight Nilvadipine and ST811 were dissolved in ethyl acetate and the solution was spread over a release paper by means of a knife coater to a thickness after drying of 100 µm. After drying, a tape preparation was obtained. The use of ethanol and an unsaturated higher fatty acid as a percutaneous drug absorption promoter in accordance with the invention results in marked improvement in percutaneous absorption of the chief ingredient. In particular, the combined use of ethanol and oleic acid results in very remarkable improvement in said chief ingredient absorption. The following test results are illustrative of the effect producible with the percutaneous absorption promoter(s) and the pharmaceutical composition for percutaneous drug absorption according to the present invention. [A] In vitro skin permeation test Test method The apparatus used was a horizontal membrane type diffusion cell. The full-thickness rat skin was used as the permeable membrane. Male SD rats weighing 200-250 g were used. They were deprived of hair in the abdominal part with an electric clipper and a depilatory cream on the day before testing. The inside of the cell which had an effective diffusion area of 5 cm² was filled with physiological saline containing 2% of a surfactant [BO-20®; Nippon Chemicals], and the rat skin was mounted on the cell. Each sample was applied to the corneum side of the skin, the drug quantity in the receptor phase was determined at timed intervals, and the rate of drug penetration through the skin was calculated. The amounts of the samples were 20 mg as ethanol per cm². The receptor phase was maintained at 37°C. Test preparations Suspension gel of Example 1 Solution gel of Example 2 Test results Test preparation Drug penetration rate in steady state µg/cm²/hour Example 1 2.05 2 7.45 [B] In vivo percutaneous absorption test in rats Male SD rats of 7 weeks of age were used in groups of three. Each test tape specimen (7 cm²) was applied to the abdominal part deprived of hair the day before testing, and the plasma nilvadipine level was determined by ECD gas chromatography. Test with ethanol- and oleic acid-containing patch preparations Test preparations Patch of Example 4 Patch of Example 5 Test results Test preparation Plasma level (ng/ml) at 4 hour at 6 hour Example 4 2.62 3.02 Example 5 3.08 6.97 [C] In vivo percutaneous absorption test in dogs Test method A test preparation specimen (50 cm²) was applied to the thoracic part of a beagle dog as deprived of hair 2 days before testing, and the plasma nilvadipine level was determined by ECD gas chromatography. [C-1] Test with patches having an adhesive layer Test preparations Patch of Example 9 Test resutls Test preparation Plasma level (ng/ml) at 4 hour at 8 hour at 24 hours Example 9 4.33 5.28 2.58 (Each group consisting of 3 dogs.) [C-2] Test with patches Test preparations Patch of Example 8 Patch of Example 12 Patch of Example 13 Patch of Example 16 Patch of Example 17 Test results Test preparation Plasma level (ng/ml) at 4 hour at 8 hour at 24 hours Example 8 1.02 2.77 1.31 Example 12 0.55 1.70 1.53 Example 13 2.65 7.54 5.13 Example 16 0.81 2.55 1.87 Example 17 3.45 7.90 5.46 (Each group consisting of 3 dogs.) The results of the above in vitro skin permeation test and in vivo percutaneous absorption tests clearly indicate that ethanol and oleic acid can markedly promote the percutaneous absorption of the dihydropyridine compound (I) and that pharmaceutical compositions for percutaneous absorption of the dihydropyridine compound (I) which improve absorption of said compound very much can be obtained by causing such absorption promoters to be contained therein.

Claims: A pharmaceutical composition for percutaneous drug absorption which comprises 5-isopropyl 3-methyl 2-cyano-6-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, ethanol and an unsaturated higher fatty acid having 10 to 26 carbon atoms. A pharmaceutical composition for percutaneous drug absorption of Claim 1, wherein the content of the active ingredient is 0.01-20% by weight, the content of the ethanol is 5-95% by weight and the content of the unsaturated higher fatty acid is 0.1-40% by weight of this composition. A pharmaceutical composition for percutaneous drug absorption as claimed in Claim 1 or 2, wherein the unsaturated higher fatty acid is oleic acid. A pharmaceutical composition for percutaneous drug absorption as claimed in Claim 1,2 or 3, wherein the 5-isopropyl 3-methyl 2-cyano-6-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate is a racemic compound. A pharmaceutical composition for percutaneous drug absorption as claimed in Claim 1, 2 or 3, wherein the 5-isopropyl 3-methyl 2-cyano-6-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate is a dextro-rotatory compound. A pharmaceutical composition for percutaneous drug absorption as claimed in Claim 1, 2, 3, 4 or 5, said composition being formulated in the form of a patch. A pharmaceutical composition for percutaneous drug absorption as claimed in Claim 1, 2, 3, 4 or 5, said composition being formulated in the form of a tape-form preparation. The use of a mixture of ethanol and an unsaturated higher fatty acid for promoting the percutaneous absorption of 5-isopropyl 3-methyl 2-cyano-6-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate. A process for preparing a pharmaceutical composition for percutaneous drug absorption which comprises mixing 5-isopropyl 3-methyl 2-cyano-6-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, ethanol, an unsaturated higher fatty acid and a base. A process for preparing a pharmaceutical composition for percutaneous drug absorption which comprises 1) spreading a drug-free sustained release matrix containing ethanol and an unsaturated higher fatty acid over a support, 2) covering the said matrix with an absorption promoter release control membrane, and then 3) coating the absorption promoter release control membrane with a base containing 5-isopropyl 3-methyl 2-cyano-6-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate. A pharmaceutical composition according to any of claims 1 to 7 for combating diseases. A pharmaceutical composition according to any of claims 1 to 7 for combating coronary angiopathy or hypertension. The use of nilvadipine, ethanol and an unsaturated higher fatty acid for the manufacture of a medicament for combating coronary angiopathy or hypertension.

Inventors: HATA, TAKEHISA, IBUKI, RINTA, ISHIKURO, HIROSHI, KADO, KAZUTAKE, UEDA, YOSHIO
Applicants: FUJISAWA PHARMACEUTICAL CO., LTD.
Application year: 1988
Main classification: A61K31
IPC codes: A61K9, A61P9, A61K31, A61K47