Widely recognized as the leading calculations textbook, Ansel's Pharmaceutical Calculations is the most trusted resource for calculations support. Time-tested after thirteen editions, it is the most comprehensive and in-depth treatment of pharmacy calculations available. The book takes a step-by-step approach to calculations, making it easy for students to work through the problems and gain greater understanding of the underlying concepts. Its focus is on the fundamental principles and basic techniques involved in the application of the calculations needed for successful pharmacy practice.