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Analgesic Anti-Inflammatory Adhesive Preparations

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Analgesic Anti-Inflammatory Adhesive Preparations Europaisches Patentamt (19) European Patent Office Office europeeneen des brevets EP 0 71 3 697 A1 (12) EUROPEAN PATENT APPLICATION (43) Date of publication: (51) |nt Cl.e: A61K9/70 29.05.1996 Bulletin 1996/22 (21) Application number: 95307605.6 (22) Date of filing: 25.10.1995 (84) Designated Contracting States: • Orihara, Masamichi DE ES FR GB IT Minamisatama-gun Saitama-ken (JP) • Sugimoto, Yoshio (30) Priority: 26.10.1994 J P 284573/94 Saitama-ken (JP) • Yamazaki, Masaru (71) Applicant: Tokuhon Corporation Kitakatsushika-gun Saitama-ken (JP) Tokyo (JP) • Hoshino, Mitsunari Saitama-ken (JP) (72) Inventors: • Uchikawa, Masumasa • Sasaki, Yasuhiko Saitama-ken (JP) Saitama-ken (JP) • Arai, Hiroshi • Matsumura, Yukihiro Saitama-ken (JP) Saitama-ken (JP) • Imai, Susumu (74) Representative: Thomas, Roger Tamlyn et al Kitatsushika-gun Saitama-ken (JP) D. Young & Co. • Tooyama, Tetsuhiro 21 New Fetter Lane Saitama-ken (JP) London EC4A 1 DA (GB) (54) Analgesic anti-inflammatory adhesive preparations (57) A non-steroidal analgesic anti-inflammatory phenylyl)propionic acid and a modified copolymer in adhesive preparation obtained by coating one surface which methylmethacrylate is allowed to graft-polymer- of support with an adhesive containing S-(+)-2- ize on said copolymer, or with an adhesive containing ( 2-fluoro-4-biphenylyl)propionic acid and a styrene-iso- S-(+)-2-(2-fluoro-4-biphenylyl) propionic acid, sodium prene-styrene block copolymer or S-(+)-2-(2-fluor-4-bi- carboxymethyl cellulose and sodium polyacrylate. Is- O) CO CO o a. LU Printed by Jouve, 75001 PARIS (FR) EP 0 713 697 A1 Description The present invention concerns a non-steroidal analgesic anti-inflammatory adhesive preparation which contains as the pharmacologically effective component S-(+)-2-(2-fluoro-4-biphenylyl) propionic acid [abbreviated S-(+)-FP 5 hereinafter] which may be optically resolved from the racemic form 2-(2-fluoro-4-biphenylyl) propionic acid (also called: flurbiprofen). Adhesive preparations or dressings for administering medicaments to and through the skin can be broadly clas- sified as poultices and plasters. They are generally composed of (i) a pharmacologically effective component, (ii) an adhesive which contains a plaster base as the principle components, and further contains, as necessary, tackifiers, 10 softeners, as well as solubilizing agents helpful in percutaneous absorption, and (iii) a flexible support which retains this adhesive in a layer shape. One or more non-steroidal analgesic anti-inflammatory drugs selected from methyl salicylate, glycol salicylate, emorfazone, diflunisal, oxaprozin, diclofenac, fenbufen, alclofenac, amfenac, indometacin, acemetacin, metiazinic acid, suprofen, ibuprofen, ketoprofen, flurbiprofen, fenoprofen, thiaprofen, tolmetin, naproxen, pranoprofen, protizinic acid, fentiazac, sulindac, clidanac, loxoprofen, lobenzarit, tolfenamic acid, flufenamic acid, and is mefenamic acid, and their salts and esters etc. are normally used as the pharmacologically effective component of the non-steroidal analgesic anti-inflammatory adhesive preparation. Without limitation to non-steroidal analgesic anti-inflammatory adhesive preparations, the most important factor in these kinds of adhesive preparations is to be able to administer the pharmacologically effective component to the affected area percutaneously with good efficiency, and in order to realize this, several proposals have previously been 20 made. For example, Japanese Patent Kokai No. 40,420/89 has the purpose of increasing the solubility of a non-steroidal analgesic anti-inflammatory drug in a plaster base, and also of increasing percutaneous absorption. This patent indi- cates the use of styrene-isoprene-styrene block copolymers as the plaster base, polyterpene resin, terpene phenol resin or petroleum resin as the tackifier, liquid paraffin as the softener, and mentha oil as the solubilizing agent. Also, 25 it is indicated in Japanese Patent Kokai No. 321 ,624/92 that, in order to improve the solubility of 4-biphenylacetic acid (also called: felbinac) which is one kind of analgesic anti-inflammatory drug, and of the ethyl esters thereof (also called: felbinac ethyl) into the plaster base, a styrene-isoprene-styrene block copolymer was selected for the plaster base, and this was used together with crotamiton. In this regard, in all the kinds of non-steroidal analgesic anti-inflammatory drugs described above, flurbiprofen is 30 synthesized as a racemic form which is a mixture of equal amount of dextrorotatory flurbiprofen and levorotatory flur- biprofen, and conventionally it was extremely difficult to resolve the racemic form. For this reason, if flurbiprofen is used as the non-steroidal analgesic anti-inflammatory drug, the precedent was to use the racemic form as is. However, racemic flurbiprofen can be resolved into dextrorotatory flurbiprofen and levorotatory flurbiprofen by a method described in Patent Publication No. 6,536/87 entitled "Production Method for Optically Active 2-Aryl Propionic 35 Acid." One of the aims of the present invention is to take advantage of the fact that dextrorotatory flurbiprofen has ex- ceptionally superior efficacy as an analgesic anti-inflammatory drug for adhesive preparations than does racemic flur- biprofen, and offers a non-steroidal analgesic anti-inflammatory adhesive preparation which uses dextrorotatory flur- biprofen, namely, S-(+)-FP, as the pharmacologically effective component. 40 Another aim of the present invention is to provide a plaster base which is suitable for dissolution and dispersion of dextrorotatory flurbiprofen. In its preferred forms the invention provides a preparation with a tackifier, as well as an assistant to promote the percutaneous absorption of dextrorotatory flurbiprofen. In the drawings:- Fig. 1 is a graph indicating the skin penetration (in vitro) of pharmacologically effective component S-(+)-FP. 45 Fig. 2 is a graph indicating the concentration change of S-(+)-FP in plasma. In accordance with the present invention, there is provided a novel non-steroidal analgesic anti-inflammatory ad- hesive preparation obtained by coating one surface of support with an adhesive which contains a non-steroidal anal- gesic anti-inflammatory drug and a plaster base. According to the first aspect of the present invention there is provided a non-steroidal analgesic anti-inflammatory so adhesive preparation obtained by coating one surface of support with an adhesive which contains a non-steroidal analgesic anti-inflammatory drug and a plaster base, wherein the said analgesic anti-inflammatory drug is S-(+)-2- (2-fluoro-4-biphenylyl)propionic acid, and the said plaster base is a styrene-isoprene-styrene block copolymer or a modified copolymer in which methylmethacrylate has been allowed to graft -polymerize on said copolymer. Said adhesive may further contains a rosin ester resin as a tackifier and/or mentha oil and at least one compound 55 selected from the group comprising intermediate chain fatty acid esters of polyhydric alcohol as a promoter for percu- taneous absorption of a pharmacologically effective component. According to the second aspect of the present invention there is provided a non-steroidal analgesic anti-inflam- matory adhesive preparation obtained by coating one surface of support with an adhesive which contains a non-ster- 2 EP 0 713 697 A1 oidal analgesic anti-inflammatory drug and a plaster base, wherein the said analgesic anti-inflammatory drug is S-(+)- 2-(2-fluoro-4-biphenylyl)propionic acid, and the said plaster base comprising sodium carboxymethyl cellulose and so- dium polyacrylate. Said adhesive may further contain an emulsion of polyacrylate esters and/or mentha oil and at least one compound 5 selected from a group consisting of intermediate chain fatty acid esters of polyhydric alcohols. Preferred embodiments of the invention will now be described in more detail by way of example. In the present invention, S-(+)-FP, which is used as the pharmacologically effective component, can be obtained from racemic flurbiprofen by the method described in the previously mentioned Patent Publication No. 6,536/87. Specifically, a mixture of an inactive organic fluid diluent, for example, a petroleum distillate, and an optically active 10 a-mono substituted alkylamine enantiomer salt of 2-(2-fluoro-4-biphenylyl) propionic acid is heated to at least 80 °C. In this case, the aforementioned amine and diluent are selected such that the salt of the racemic acid and the amine has a solubility 0. 1 -1 0%W/V in the diluent at the operating temperature. By having a part of the salt remain undissolved in the diluent, a part of the optical isomer of one of the acid components in the salt is converted to its enantiomer, and after that enantiomer increased and the salt of the acid component which increased compared to the other has been is collected, S-(+)-FP can be obtained by making the salt acidic with dilute hydrochloric acid or dilute sulfuric acid and then extracting with ether. In addition, the present invention substitutes dextrorotatory S-(+)-FP for racemic flurbiprofen as the pharmacolog- ically effective component, and it can be therefore distinguished from conventional adhesive preparations which use racemic flurbiprofen, and, except for the racemic flurbiprofen, it is possible to combine the conventionally known non- 20 steroid analgesic anti-inflammatory drugs in the adhesive preparation of the present invention. Plasters, in which the adhesive that is coated on the flexible support is
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