Patent ID: 7045145

Claim:
A transdermal delivery system comprising a backing layer, and an adhesive polymer matrix affixed to the backing layer, wherein the adhesive polymer matrix is formulated by combining, on a weight percentage basis: a) from about 0% to about 10% of a humectant/plasticizer; b) from about 20% to about 70% of an adhesive copolymer; c) from about 10% to about 60% percent of a combination of skin permeation enhancing agents which is a mixture comprising dimethyl sulfoxide, a fatty (C 8 –C 20 ) alcohol ester of lactic acid, a lower (C 1 –C 4 ) alkyl ester of lactic acid and capric acid present in ratio ranging from about 2:1:1:0.8 to about 6:1:1:0.8, respectively; d) a progestin hormone; and e) an estrogen hormone.