Over 20 years ago the Third Edition of the Handbook of Dissolution Testing was published. During that time to the present, new regulatory expectations, new compendial chapters and guidances, new equipment especially for special dosage forms, and more meaningful dissolution test media and conditions have significantly influenced every aspect of dissolution testing. This new Fourth Edition expands and details these topics providing regulatory agencies, educational institutions, and manufacturing labs in every corner of the globe the new information necessary to improve pharmaceutical quality. The Handbook is authored by Bryan Crist, Vivian Gray, and Royal Hanson.