Quantitative calculations are common everyday practice for the analytical chemist in his laboratory work. This book aims at familiarizing students and technicians with such calculations done in pharmaceutical analysis, biopharmaceutics, pharmacokinetics, pharmacy practice, pharmaceutical chemistry, physical pharmacy and radiopharmacy. It exposes the reader to various approaches for problem solving and aids in consolidating theoretical knowledge by applying it to the solution of real problems. Structured in 15 chapters, each one containing a short introduction of the relevant theory and equations to facilitate the comprehension of theoretical principles and the solution of the relevant problems.