EMULSION-TYPE EXTERNAL PREPARATION, AND METHOD FOR PRODUCTION THEREOF

摘要

Disclosed are: an emulsion-type external preparation in which the precipitation of crystals of an alkali metal salt or an alkali earth metal salt of a carboxylic acid-type pharmaceutical active ingredient compound or a hydrate of the salt can be prevented effectively, which is mildly irritative, and in which the decrease in the content of the active ingredient can be prevented; and a method for producing the emulsion-type external preparation. Specifically disclosed are: an emulsion-type external preparation produced by mixing an emulsion and a treated acidic water-soluble polymer solution, wherein the emulsion is produced by emulsifying thefollowing components (a) and (b): (a) an aqueous phase comprising a pharmaceutical active ingredient compound having a carboxylate group and taking the form of an alkali metal salt or an alkali earth metal salt and an aqueous solvent; and (b) an oily phase comprising at least one oily component selected from the group consisting of a fatty acid ester, a hydrocarbon, an animal or plant oil, a hydrogenated oil thereof and a natural wax, and wherein the treated acidic water-soluble polymer solution is prepared by treating the whole or a part of an acidic water-soluble polymer with a basic substance in an aqueous solvent; and a method for producing the emulsion-type external preparation. Also specifically disclosed are: an emulsion-type external preparation produced by mixing an emulsified composition comprising a pharmaceutical active ingredient compound having a carboxylate group and taking the form of an alkali metal salt or an alkali earth metal salt with a solution comprising an acidic water-soluble polymer treated with a basic substance; and a method for producing the emulsion-type external preparation.