Patent ID: 8668925

Claim:
A composition for transdermal delivery comprising a drug-containing layer wherein the drug-containing layer consists essentially of Gestodene or an ester thereof, ethinyl estradiol and at least one pharmaceutically acceptable earner which comprises a polyisobutylene polymer, one or more tackifiers selected from the group consisting of hydrocarbon resins, rosin resins and terpene resins and optionally a polybutene polymer, and wherein the drug-containing layer contains 25% to 99% by weight of polyisobutylene polymer(s) including at least one polyisobutylene polymer with a high molecular weight of about 500,000 to 2,000,000 Da and at least one polyisobutylene polymer with a low molecular weight of about 20,000 to 100,000 Da, wherein the drug-containing layer has a solubility for said Gestodene or an ester thereof of no more than 3% by weight of the drug-containing layer and the Gestodene or an ester thereof is completely dissolved in the layer, wherein the Gestodene or an ester thereof is in an amount ranging between 0.5 and 3% by weight of the drug-containing layer, and wherein the drug-containing layer excludes a skin penetration enhancer.