PERCUTANEOUSLY ADMINISTRABLE BASE COMPOSITION AND PERCUTANEOUSLY ADMINISTRABLE DRUG COMPOSITION PREPARED THEREFROM

Abstract: A percutaneously administrable base composition comprising a sorbefacient, humectant, water, torpent, lower alcohol and organic acid; and a percutaneously administrable drug composition comprising a drug and the base composition.

Description: Technical Field This invention relates to a percutaneous administration base composition (or percutaneously administrable base composition) which enhances a medicine in percutaneous absorbability and is a low. irritative to the skin and also relates to a percutaneous administration medicinal composition in which a medicine is contained in said base composition. Background Art Methods of administering a medicine (or drug) which have heretofore been known, include those of peroral, rectal, hypodermic and intravenous administrations, among which peroral administration has widely been adopted. However, peroral administration of a medicine is disadvantageous in that, for example, the medicine is subject to primary metabolism at the liver after the absorption thereof, and an unduly high concentration of the medicine is temporarily appreciated after the administration thereof. Further, it has often been reported that side effects such as gastroenteric tract troubles, nausea and lack of appetite are caused when a medicine is perorally administered. Percutaneous administration of a medicine has recently been noted in attempts to avoid such disadvantages of peroral administration and to meet the requirements of safe and sustained absorption of the medicine. In view of the above, the development of medicines for external application has been positively promoted and the medicines so developed have already been on the market. Such percutaneous administration preparations, however, are yet often insufficient in percutaneous absorption of the medicine and, therefore, it cannot be said in fact that the object to provide a desired preparation is fully attained. More particularly, since the normal skin originally has a barrier function to prevent foreign matters from permeating into the body, the base singly used as such in an ordinary percutaneous administration preparation will not let the medicine used therein be fully percutaneously absorbed. It is thus required that the permeability of the medicine through the horney layer of the skin be controlled to enhance the medicine in percutaneous absorbability. To this end, it is generally tried that a so-called percutaneous absorption promoter is added to the base. The absorption promoters which have already been proposed, include a combination of dimethylacetoamide with ethyl alcohol, isopropyl alcohol, isopropyl palmitate (U.S. Patent No. 3,472,931); a combination of 2-pyrrolidone with a suitable oil or with an ester of a straight-chain fatty acid and an alcohol (US Patent No. 4,017,641); and a combination of a lower alcohol with one of an alcohol having 7 - 20 carbon atoms, an aliphatic hydrocarbon having 5 - 30 carbon atoms, an ester of an aliphatic carboxylic acid with an alcohol, a mono- or diether having 10 - 24 carbon atoms and a ketone having 11 - 15 carbon atoms, and also with water (Japanese Pat. Appln. Laid-Open Gazette No. Sho 61-249934). It cannot be said yet, however, that the above conventional absorption promoters and absorption promoting compositions are sufficiently safe for the skin. Further, it is attempted to enhance a basic medicine in percutaneous permeability by having an organic acid contained in a preparation comprising the basic medicine and, however, such attempt does not exert sufficient remedial effects as yet. Furthermore, a low irritative absorption promoting composition is reported in Japanese Pat. Appln. Laid-Open Gazette No. Hei 2-115131; however, this composition is still appreciated to be irritative to the skin site where it is administered in case of subjects who are highly susceptible to an alcohol. Disclosure of the Invention This invention has been made to solve the problems of the above-mentioned conventional techniques and has for its object to provide a percutaneous administration base composition which enhances a medicine in percutaneous absorbability when the medicine is contained in the base composition and is remarkably low irritating to the skin where a medicinal composition is administered and also to provide an excellently safe percutaneous administration medicinal composition comprising said base composition and a medicine. This invention resides in not only a percutaneous administration base composition comprising an absorption promoter (sorbefacient), moisture-retaining agent (humectant), water, irritation-lessening agent, lower alcohol and organic acid thereby to solve the above problems, but also a percutaneous administration medicinal composition wherein a medicine is contained in said base composition. The percutaneous administration base composition of this invention will enhance a medicine in percutaneous permeability when the medicine is contained therein, is less in skin irritability and excels in physical stability of the base composition. In addition, the percutaneous administration medicinal composition of this invention enables the medicine contained therein to be excellent in percutaneous permeability, physical stability, low irritability to the skin. This invention will be explained below in more detail. The absorption promoters usable in this invention are preferably medium or long chain fatty acids, aliphatic alcohols or fatty acid esters, with those having 7 - 20 carbon atoms being particularly preferred. It has been found that particularly lauryl alcohol and myristyl alcohol exhibit high absorption promotability or accelerability of the medicine and are comparatively less irritative to the skin. The moisture-retaining agents used in this invention preferably include aliphatic polyhydric alcohols and sugar alcohols. These alcohols include sorbitol, polyethylene glycol, diglycerin, propylene glycol, butylene glycol, dipropylene glycol, sodium pyrrolidone carboxylate, ethyl carbitol, D-xylytol, glycerin and hyaluronic acid, among which glycerin and polyethylene glycol are particularly preferred. The water component used in this invention may be purified water or a buffer, and it is desired that these water and buffer be adjusted to a pH of 5 - 7. In addition, the buffer may be any one only if it has a pH of 5 - 7 which is applicable to human bodies, and is exemplified by a maleic acid buffer, a maleic acid-Tris buffer, an acetic acid-sodium acetate buffer, a Tris buffer, a phosphoric acid buffer, a phosphoric acid-citric acid buffer, an imidazole buffer, a S-collidine buffer, a triethanolamine buffer or a pyrophosphoric acid buffer, with the phosphoric acid-citric acid buffer and the phosphoric acid buffer being particularly preferred. Further, the buffers usable in this invention are not limited to the above-mentioned ones, and they may be any one having a pH value of 5 - 7 which is applicable to human bodies and can be obtained by combining an acid with a base. The preferable irritation-lessening agents used in this invention include medium or long chain fatty acid esters, sorbitol-fatty acid esters and mixtures thereof with glycerin monooleate, glycerin monolaurate, sorbitan-monolaurate and mixtures thereof being particularly preferred as exhibiting remarkable dermal irritation-lessening effects. The particularly preferable lower alcohols used in this invention are ethanol and isopropanol. The organic acids used in this invention include acetic acid, lactic acid and salts thereof, N-2-hydroxyethylpiperidine-N'-2-ethanesulfonic acid which is hereinafter abbreviated as HEPES, and dehydrocholic acid. In addition, the organic acids usable herein also include water-soluble inorganic salts of organic acids with sodium acetate, sodium dehydrocholate and sodium lactate being particularly noted. According to this invention, the presence of the organic acid in the optimum concentration will enable the amount of a medicine permeated through the skin to be remarkably increased without strengthening dermal irritation due to the medicine. This tendency will be particularly noted when the organic acid is contained in a suitable proportion. The percutaneous administration base composition of this invention is disclosed in claim 1. In cases where the contents of the components comprised in such a base cmposition as above are in ranges respectively outside of said ones according to this invention, a medicine contained in said composition and said composition itself will exhibit the following disadvantages when applied to the skin. If the content of the absorption promoter is less than 0.1% by weight in a base composition, a medicine contained therein will not be appreciated to exert its percutaneous permeability; further, the content thereof exceeding 10% by weight in the composition will be appreciated to cause the composition to bring about skin irritation. If the content of the moisture-retaining agent is less than 15% by weight in the composition, the composition will cause skin irritation; on the other hand, if the content thereof exceeds 40% by weight, the medicine contained in the composition will be liable to be remarkably lessened in percutaneous permeability. If the content of water is less than 20% by weight, the composition will cause skin irritation; on the other hand, if the content thereof exceeds 70% by weight, the medicine will be liable to be remarkably worsened in percutaneous permeability. If the content of the irritation-lessening agent is less than 0.5% by weight, none of irritation-lessening effects of the composition will be appreciated; further, the content thereof exceeding 10% by weight is not desirable since the composition will contrarily exhibit skin irritation. If the content of ethanol or isopropanol is less than 10% by weight, the medicine contained in the composition will be remarkably lowered in percutaneous permeability; on the other hand, the content thereof exceeding 40% by weight is not preferable since the composition will be liable to increase skin irritation. If the content of the organic acid is less than 0.1% by weight in the composition, the medicine contained therein will be remarkably lessened in percutaneous permeability; in addition, the content thereof exceeding 10% by weight will remarkably lessen the medicine in percutaneous premeability similarly to the above-mentioned case and, furthermore, the composition will cause undesirable skin irritation. The percutaneous administration base composition of this invention appropriately contains each base component in such an amount as will be specified hereinbelow. Namely, the content of the absorption promoter ranges from 0.1 to 10% by weight, preferably from 0.3 to 8% by weight and most preferably from 0.5 to 3% by weight. The content of the moisture-retaining agent ranges from 15 to 40% by weight, preferably from 20 to 38% by weight and most perferably from 25 to 35% by weight. The content of water ranges from 20 to 70% by weight, preferably from 25 to 60% by weight and most preferably from 30 to 50% by weight. The content of the irritation-lessening agent ranges from 0.5 to 10% by weight, preferably from 1 to 7% by weight and most preferably from 1 to 5% by weight. The content of ethanol or isopropanol ranges from 10 to 40% by weight, preferably from 15 to 30% by weight and most preferably from 20 to 25% by weight. The content of the organic acid described above ranges from 0.1 to 10% by weight, preferably from 0.3 to 8% by weight and most preferably from 0.5 to 5% by weight. As previously mentioned, all the percentages for the base components of the base composition total 100%. A particularly excellent percutaneous administration base composition can be obtained by selecting the contents of these base components so that the contents selected constitute a more preferable or the most preferable weight ratio among them. The medicines which may be contained in the percutaneous administration base,composition of this invention are not particularly restricted so long as they are percutaneously absorbable. They include hypnotic/sedatives (nitrazepam, barbital, etc.), antipyretic, anti-inflammatory, analgesic agents (ketoprofen, indomethacin, butorphanol tartrate, pentazocine, loxoprofen, diclofenac, felbinac, etc.), stimulant/analeptic agents (methamphetamine, bemegride, etc.), psychoneurotic agents (meprobamate, imipramine, etc.), local anesthetics (lidocaine, procaine, etc.), drugs for hyperuricemia (allopurinol, benzbromarone, etc.), drugs for urination disorders (oxybutynin, etc.), skeletal muscle relaxants (tizanidine hydrochloride, eperisone hydrochloride, dantrolene, etc.), autonomic drugs (carpronium, neostigmine, etc.), antiparkinson agents, antihistaminic agents (mequitazine, diphenhydramine, etc.), bronchodilating agents (tulobuterol hydrochloride, sodium cromoglycate), cardiotonic agents (digoxin, aminophylline, etc.), vasodilator agents (nitroglycerin, isosorbide nitrate, nifedipine, etc.), peripheral vasodilator agents (nicametate, cyclandelate, etc.), drugs for circulatory organs (flunarizine, ibudilast, etc.), drugs for arrhythmia (atenolol, alprenolol hydrochloride, etc.), antiallergic agents (tranilast, ketotifen fumarate, mequitazine, etc.), antivertigo agents (betahistine, diphenidol, etc.), narcotic analgesics (morphine, fentanyl citrate, etc.), cortex hormone agents (prednisolone, betamethasone, etc.), male hormone agents (testosterone, etc.), follicle corpus luteal hormone agents (estradiol, estriol, etc.), dermatological sterilization agents, wound protectors, external preparations for purulent diseases (kanamycin, etc.) and drugs for parasitic skin diseases (miconazole, etc.). Use may be made of either one of these medicines or a combination of two or more thereof. Needless to say, medicines in the form of publicly known inorganic or organic salts are also included in those containable in the composition of this invention. The above-mentioned medicines may each usually be contained in the percutaneous administration medicinal composition in an amount of from 0.001 to 20% by weight thereof. The percutaneous administration medicinal composition of this invention may be administered in the form of gels, creams, liniments, reserver-type patches, cataplasmas, etc. If needed, a gelling agent (thickener) may be added to the composition. The appropriate gelling agents include carboxyvinyl polymers, polysodium acrylate, polyvinylpyrrolidone, hydroxypropylmethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, methylcellulose, carboxymethylcellulose and salts thereof. If necessary, there may be added to the composition additives such as ultraviolet absorbers, antioxidants and preservatives. The appropriate ultraviolet absorbers include publicly known p-aminobenzoic acid derivatives, anthranilic acid derivatives, salicylic acid derivatives, coumalic acid derivatives, amino acid derivatives, benzotriazole derivatives, tetrazole derivatives, imidazoline derivatives, pyrimidine derivatives, dioxane derivatives, furan derivatives, pyrone derivatives, camphor derivatives, nucleic acid derivatives, allantoin derivatives, nicotinic acid derivatives, shikonin and vitamin 6 derivatives. In particular, benzophenone derivatives such as 2-hydroxy-4-methoxybenzophenone derivatives can be appropriately used as the ultaviolet absorbers. The antioxidants include ascorbic acid, stearic acid esters, sodium ascorbate, tocopherol (d-, 1- and dl-isomers of α-tocopherol, β-tocopherol, γ-tocopherol, 6-tocopherol, etc.) and ester derivatives thereof, nordihydroguaiaretic acid, dibutylhydroxytoluene, butylhydroxyanisole, tert-butylhydroxynongallic acid esters (ethyl ester, propyl ester, isoamyl ester, etc.) and 1-oxo-3-methyl-4-isopropylbenzene. The preservatives include benzoic acid, sodium benzoate, ethyl p-hydroxybenzoate, propyl p-hydroxybenzoate and butyl p-hydroxybenzoate. Best Mode for Carrying Out the Invention To further illustrate this invention in greater detail, the following Examples will be given. In these Examples and Comparative Examples, all percentages are by weight and the content (% by weight) of a medicine means a ratio thereof to the whole percutaneous administration medicinal composition. Example 1 Ethanol 24 % purified water 42.5% glycerol 25 % lauryl alcohol 0.5% glycerol monooleate 3 % sorbitan monolaurate 1 % sodium acetate 0.5% carboxymethylcellulose sodium 3.5% total 100 %. To a mixture of the above components was added 3% of tulobuterol hydrochloride thereby to give a percutaneous administration medicinal composition. Example 2 Ethanol 24 % buffer (pH 6.8, phosphoric acid-citric acid buffer) 34 % polyethylene glycol 300 25 % lauryl alcohol 3 % sorbitan monolaurate 2 % glycerol monooleate 8 % sodium acetate 2 % hydroxypropylmethylcellulose 4000 2 % total 100 %. To a mixture of the above components was added 2% of fentanyl citrate thereby to give a percutaneous administration medicinal composition. Example 3 Ethanol 24 % purified water 24 % polyethylene glycol 400 25 % lauryl alcohol 10 % glycerol monolaurate 8 % sorbitan monolaurate 2 % sodium lactate 5 % hydroxypropylmethylcellulose 4000 2 % total 100 %. To a mixture of the above components was added 5% of alprenolol hydrochloride thereby to give a percutaneous administration medicinal composition. Example 4 Ethanol 15 % buffer (pH 6.8, phosphoric acid buffer) 28 % polyethylene glycol 300 30 % myristyl alcohol 5 % glycerol monooleate 5 % HEPES 15 % hydroxypropylmethylcellulose 4000 2 % total 100 %. To a mixture of the above components was added 5% of ibudilast thereby to give a percutaneous administration medicinal composition. Example 5 Ethanol 24 % purified water 44 % polyethylene glycol 300 25 % myristyl alcohol 2 % sorbitan monolaurate 2 % acetic acid 1 % hydroxypropylmethylcellulose 4000 2 % total 100 %. To a mixture of the above components was added 5% of atenolol thereby to give a percutaneous administration medicinal composition. Example 6 Isopropanol 20 % purified water 39 % polyethylene glycol 400 35 % myristyl alcohol 1 % sorbitan monolaurate 1 % acetic acid 0.5% sodium acetate 1 % hydroxypropylmethylcellulose 4000 2.5% total 100 %. To a mixture of the above components was added 3% of oxybutynin hydrochloride thereby to give a percutaneous administration medicinal composition. Example 7 Ethanol 24 % buffer (pH5, acetic acid buffer) 44 % polyethylene glycol 300 25 % lauryl alcohol 0.5% glycerol monooleate 3 % sorbitan monolaurate 1 % sodium acetate 0.5% hydroypropylmethylcellulose 4000 2 % total 100 %. To a mixture of the above components was added 3% of tizanidine hydrochloride thereby to give a percutaneous administration medicinal composition. Comparative Example 1 (containing no organic acid) Ethanol 24 % buffer (pH7, phosphoric acid buffer ) 43 % glycerol 25 % lauryl alcohol 0.5% glycerol monooleate 3 % sorbitan monolaurate 1 % carboxymethylcellulose sodium 3.5% total 100 %. To a mixture of the above components was added 3% of tulobuterol hydrochloride thereby to give a percutaneous administration medicinal composition. Comparative Example 2 (containing no organic acid) Isopropanol 20 % buffer (pH6, citric acid buffer) 26 % polyethylene glycol 400 35 % myristyl alcohol 15 % sorbitan monolaurate 2 % hydroxypropylmethylcellulose 4000 2 % total 100 %. To a mixture of the above components was added 3% of oxybutynin hydrochloride thereby to give a percutaneous administration medicinal composition. Comparative Example 3 (according as Japanese Patent Application Laid-Open Gazette No. Sho 61-249934) (containing no organic acid) Ethanol 49 % purified water 47 % lauryl alcohol 1 % carboxymethylcellulose sodium 3 % total 100 %. To a mixture of the above components was added 5% of fentanyl citrate thereby to give a percutaneous administration medicinal composition. Comparative Example 4 (containing no organic acid) Ethanol 20 % purified water 37 % polyethylene glycol 400 25 % sorbitan monolaurate 15 % carboxymethylcellulose sodium 3 % total 100 %. To a mixture of the above components was added 5% of alprenolol hydrochloride thereby to give a percutaneous administration medicinal composition. Comparative Example 5 (containing no irritation-lessening agent) Ethanol 20 % purified water 37 % myristyl alcohol 5 % glycerol 15 % acetic acid 20 % carboxymethylcellulose sodium 3 % total 100 %. To a mixture of the above components was added 3% of tulobuterol hydrochloride thereby to give a percutaneous administration medicinal composition. Comparative Example 6 (containing neither absorption promoter nor irritation-lessening agent) Ethanol 30 % buffer (pH7, phosphoric acid buffer) 59 % citric acid 11 % total 100 %. To a mixture of the above components was added 5% of atenolol thereby to give a percutaneous administration medicinal composition. Test Example The percutaneous administration medicinal compositions obtained in the above Examples 1 to 7 and Comparative.Examples 1 to 6, were each tested for percutaneous permeation of the medicine in vitro with the use of extirpated hairless mouse skin. Also, the percutaneous administration medicinal compositions were subjected to a skin irritation test. This test was carried out as follows. The compositions were each applied to the skin of each of human subjects. The compositions so applied were peeled from the skin of the subjects 24 hours after their application to the skin. A skin irritation test was made for evaluation scores on each subject at the skin spot (from which the applied composition was peeled) two times, that is, just soon and 24 hours after the peeling of the applied composition in order to find two evaluation scores which are determined from Table 2. The higher one of the two scores so found was taken as the irritation value for a particular subject, and the higher scores for the individual subjects were summed up and then the sum was divided by number of the subjects thereby to obtain a skin irritation value (SI value). Table 1 summarizes the results. SI value = sum of higher one of two scores obtained for individual subjects immediately after peeling of applied composition and 24 hours after peeling thereof number of subjects x 100 Ex. & Comp. Ex. Amount of Medicine permeating through Skin (µg/cm 2 /hr) Skin Irritation value (SI value) Ex. 1 180.8 11.0 Ex. 2 210.7 13.0 Ex. 3 320.5 22.0 Ex. 4 377.5 20.0 Ex. 5 30.5 8.0 Ex. 6 112.2 16.0 Ex. 7 50.7 3.0 Comp. Ex. 1 50.2 11.0 Comp. Ex. 2 90.0 14.0 Comp. Ex. 3 300.1 190.0 Comp. Ex. 4 90.2 20.0 Comp. Ex. 5 170.7 80.0 Comp. Ex. 6 11.5 20.0 Evaluation Conditions Score - no response 0 ± slight erythema 0.5 + erythema (rubefaction) 1.0 ++ erythema + edema (overall rising) 2.0 +++ erythema + edema + papule or small bulla 3.0 Industrial Applicability In the percutaneous administration medicinal composition of this invention comprising the components as described above, the medicine contained therein can be efficiently and continuously absorbed percutaneously directly into the circulating blood. Further, the composition of this invention is a remarkably low irritative to the skin where it is administered. Furthermore, the percutaneous administration medicinal composition of this invention makes it possible to sustain the effective concentration of the medicine in the blood without the medicine being subjected to the primary metabolism in the liver due to the first pass effect as observed in case of peroral administration. It is furthermore expected that the percutaneous administration medicinal composition is free from any side effects which might be caused by a rapid increase in the concentration of the medicine in the blood as observed in peroral administration. Accordingly, the percutaneous administration medicinal composition of this invention is useful particularly as an external preparation to be administered percutaneously.

Claims: A percutaneous administration base composition comprising, by weight, 0.1 - 10% of an absorption promoter, 15 - 40% of a moisture-retaining agent 20 - 70% of water, 0.5-10% of an irritation-lessening agent, 10 - 40% of ethanol or isopropanol, and 0.1-10% of an organic acid selected from the group consisting of acetic acid and salts thereof, lactic acid and salts thereof, N-2-hydroxyethylpiperidine-N'-2-ethanesulfonic acid, dehydrocholic acid and sodium dehydrocholate, all the percentages for said components totaling 100%. A percutaneous administration base composition according to claim 1, wherein the absorption promoter is lauryl alcohol or myristyl alcohol, the moisture-retaining agent is glycerin or polyethylene glycol, the water is purified water or a buffer and the irritation-lessening agent is glycerin monooleate, glycerin monolaurate or sorbitan-monolaurate. A percutaneous administration base composition according to claim 1 or 2, comprising, by weight, 0.3 - 8% of the absorption promoter, 20 - 38% of the moisture-retaining agent, 25 - 60% of the water, 1 - 7% of the irritation-lessening agent, 15 - 30% of the ethanol or isopropanol and 0.3 - 8% of the organic acid selected from the group consisting of acetic acid and salts thereof, lactic acid and salts thereof, N-2-hydroxyethylpiperidine-N'-2-ethanesulfonic acid, dehydrocholic acid and sodium dehydrocholate. A percutaneous administration base composition according to claim 3, comprising, by weight, 0.5 - 3% of the absorption promoter, 25 - 35% of the moisture-retaining agent, 30 - 50% of the water, 1 - 5% of the irritation-lessening agent, 20 - 25% of ethanol or isopropanol and 0.5 - 5% of the organic acid selected from the group consisting of acetic acid and salts thereof, lactic acid and salts thereof, N-2-hydroxyethylpiperidine-N'-ethanesulfonic acid, dehydrocholic acid and sodium dehydrocholate. A percutaneous administration base composition according to claim 1, 2, 3 or 4, wherein the water is purified water or a buffer each having a pH of 5 - 7. A percutaneous administration medicinal composition wherein a medicine is contained in the percutaneous administration base composition according to any one of claims 1 - 5.

Inventors: HIGO NARUHITO, KOMORI KEN-ICHI, HIGO, NARUHITO, KOMORI, KEN-ICHI, HIGO, Naruhito, Hisamitsu Pharmaceutical Co., Inc., KOMORI, Ken-ichi, Hisamitsu Pharmaceutical Co. Inc
Applicants: HISAMITSU PHARMACEUTICAL CO, HISAMITSU PHARMACEUTICAL CO., INC.
Application year: 1995
Main classification: A61K9
IPC codes: A61K47, A61K9