Pharmaceutical composition for treating periodontal

Claim 1

A controlled-released pharmaceutical composition in the form of gel, sheet, film, or bar to be inserted or placed into a periodontal pocket for treating a periodontal disease, said composition comprising a therapeutically effective amount of at least one active agent effective for the treatment of the periodontal disease, said active agent being dispersed in a two-phase carrier consisting of (a) a continuous phase consisting of a watersoluble polymer capable of dissolving in water at a concentration of more than 1% by weight irrespective of pH, and (b) a discontinuous phase consisting of solid particles composed of a polymer capable of dissolving in water at a concentration of between about 0.1% and 1.0% by weight or solid particles composed of a polymer capable of dissolving in water having a pH higher than 4.0 or a pH lower than 6.0, at a concentration of more than 1% by weight, said particles having an average size ranging from 1 μ to 500 μ and being dispersed in said water-soluble polymer, with the weight ratio of said particles to said water-soluble polymer ranging from 1:99 to 99:1 on a dry weight basis, said water-soluble polymer being selected from the group consisting of methyl cellulose, hydroxypropyl cellulose, sodium carboxymethyl cellulose, hydroxypropylmethyl cellulse, hydroxyethyl cellulose, sodium alginate, propylene glycol alginate, pullulan, tragacanth, xanthan gum, chitosan, polyethylene oxide, polyvinyl pyrrolidone, polyvinyl alcohol, polyacrylic acid, polymethacrylic acid, and salts thereof, and said solid particles being selected from the group consisting of poly(glycolic acid), poly(lactic acid), polytetramethylglycolide, polydiethylglycolide, polyε-caprolactone, poly(DL-decalactone), poly(alkyleneadipate), methylacrylate/methacrylic acid copolymer, methylacrylate/methacrylic acid/octylacrylate copolymer, ethyl acrylate/methacrylic acid copolymer, methylacrylate/ methacrylic acid/methylmethacrylate copolymer, methyl methacrylate/methacrylic acid copolymer, cellulose acetate phthalate, cellulose acetate succinate, cellulose acetate maleate, starch acetate phthalate, amylose acetate phthalate, methyl cellulose phthalate, hydroxypropylmethyl cellulose phthalate, hydroxyethyl ethylcellulose phthalate, hydroxypropylmethyl cellulose acetate succinate, carboxymethylethyl cellulose, polyvinylalcohol phthalate, polyvinyl acetate phthalate, polyvinylacetal phthalate, polyvinylbutylate phthalate, methylmethacrylate/dimethylaminoethyl methacrylate copolymer, and polyvinylacetal/dimethylamino acetate.