Described are transdermal drug delivery systems for the transdermal administration of norethindrone acetate in the form of a flexible finite system for topical application, comprising a drug-in-adhesive polymer matrix comprising norethindrone acetate (NETA) as the only systemically active drug, an adhesive polymer selected from silicone adhesives and polyisobutylene (PIB) adhesives, a penetration enhancer, and a crystallization inhibitor. Methods of making and using the systems also are described.
