Patent ID: 8586080

Claim:
A transdermal drug delivery system comprising a pharmaceutically acceptable carrier composition comprising a blend of: (i) one or more polymers selected from the group consisting of polyacrylates, polysiloxanes, silicone fluids, rubbers, gums, polyisobutylenes, polyvinylethers, polyurethanes, styrene block copolymers, styrene/butadiene polymers, polyether block amide copolymers, ethylene/vinyl acetate copolymers, and vinyl acetate based polymers; (ii) a crystallization inhibiting effective amount of a polyoxazoline polymer in an amount from about 1% to about 25% by weight, based on the dry weight of the total carrier composition; and (iii) a therapeutically effective amount of one or more active agents, wherein said one or more active agents comprises a steroidal hormone and wherein said amount comprises from about 0.01% to about 50% by weight, based on the dry weight of the total carrier composition.