A composition of matter for application to a body surface or membrane to administer oxybutynin by permeation through the body surface or membrane, the composition comprising, in combination, the oxybutynin to be administered, in a therapeutically effective amount; and a permeation-enhancing mixture comprising...http://www.google.es/patents/US5900250?utm_source=gb-gplus-sharePatente US5900250 - Monoglyceride/lactate ester permeation enhancer for oxybutnin
Monoglyceride/lactate ester permeation enhancer for oxybutnin