Now in its Fourth Edition, this book presents a systematic approach to solving dosage calculation problems using dimensional analysis. The book incorporates the simple to complex approach, focusing on understanding how to problem solve. This text uses the simple-to-complex approach in teaching students clinical calculations and is, therefore, divided into four sections. 1.) Clinical Calculations introduces the concepts and includes a comprehensive pre-test. 2.) Practice Problems allows the student the opportunity to refine the skills presented in section 3.)Case Studies (35) helps the student relate dosage calculations to real clinical situations. 4.) A Comprehensive Post-Test contains 25 questions allowing the instructor to assess the student's mastery of solving clinical calculations using dimensional analysis.