The invention is a transdermal drug delivery composition of at least one physiologically active agent (e.g. buspirone or fentanyl or androgens such as testosterone), at least one volatile solvent (e.g. isopropanol or ethanol), and at least one viscosity modulating agent (e.g. PVP), preferably with a penetration enhancer (such as octisalate), which is preferably applied to the axilla.