Guides readers on the proper use of in vitro drug release methodologies in order to evaluate the performance of special dosage forms In the last decade the application of drug release testing has widened to a variety of novelspecial dosage forms. In order to predict the in vivo behavior of such dosage forms the design and development of the in vitro test methods need to take into account various aspects including the dosage form design and the conditions at the site of application and the site o