Local anesthetic for external use

Details Local anesthetic for external use Local anesthetic for external use

A - Human Necessities

61

K

A61K 31/165 (2006.01) A61K 31/167 (2006.01) A61K 47/10 (2006.01) A61K 47/12 (2006.01) A61K 47/32 (2006.01) A61K 47/38 (2006.01)

Patent

CA 2268535

A local anesthetic for external use is prepared by blending a) an active ingredient selected from lidocaine, prilocaine, and pharmaceutically acceptable salts thereof, b) a percutaneous absorption accelerator, c) ethanol and/or isopropyl alcohol, and d) water such that the blending ratio of ethanol and/or isopropyl alcohol to water is preferably 0.5 to 1.2 in weight, and pH is preferably adjusted to be 6.0 to 8.5. Thus the percutaneous absorption type local anesthetic for external use is provided, which is conveniently used when it is applied and peeled off, which is applicable to a broad skin surface, and which is excellent in percutaneous absorption and quick efficacy as well as excellent in stability.

L'invention concerne un anesthésique local à usage externe préparé en mélangeant a) un ingrédient actif sélectionné parmi lidocaïne, prilocaïne, et des sels de ces composés acceptables sur le plan pharmaceutique, b) un accélérateur d'absorption percutanée, c) un alcool éthylique et/ou un alcool isopropylique, et d) de l'eau de telle sorte que le rapport de mélange entre l'alcool éthylique et/ou l'alcool isopropylique et l'eau soit compris de préférence entre 0,5 et 1,2 en poids, avec un pH de préférence ajusté entre 6,0 et 8,5. Ainsi, l'anesthésique local à usage externe du type à absorption percutanée selon l'invention est facilement appliqué et décollé, est applicable sur une grande surface de la peau, permet une excellente absorption percutanée, et présente une grande efficacité et une excellente stabilité.

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