US Patent 7182955 Abuse-resistant transdermal dosage form

The invention comprises a transdermal dosage form comprising a active agent component comprising a polymeric matrix and an abusable drug substance, an overlay backing, a porous material, and an antagonist reservoir comprising an antagonist to the abusable drug substance. The porous material adjoins the antagonist reservoir and is in fluid communication with the skin-contacting surface defined by the active agent component. In one embodiment, the device comprises a barrier layer interposed between the active agent component and the antagonist reservoir.