Oral Drug Bioavailability: Variations, Limitations, and Control Theraputic Systems: The ALZA Concept Automatic, Feedback Controlled, Drug Delivery Devices Percutaneous Absorption Bioavailibility Properties of Osmotically Controlled Drug Delivery Systems The Control of Drug Bioavailibility from Ophthalmic Dosage Forms Bioavailibility of Macromolecular Drugs and Its Control Molecular Entrapment and Release Properties of Drugs by Cyclodextrins Index.