The Drug Delivery Special Interest Group will deal with the science and technology of controlled release of active agents from delivery systems. Controlled drug release is achieved by the use of diffusion, chemical reactions, dissolutions or osmosis, used either singly or in combination. While the vast majority of such delivery devices are based on polymers, controlled release can also be achieved by the use of mechanical pumps. In a broader sense, controlled release also involves control over the site of action of the active agent, using the active agent using pro-drugs, targetable water soluble polymers or various microparticulate systems. Relevant aspects of toxicology, bioavailability, pharmacokinetics, and biocompatibility are also included.