This systematic guide to solving dosage calculation problems uses a consistent, straightforward approach, employing the Dimensional Analysis -- or Label Factor -- method. Since the focus is placed on understanding how to problem solve rather than on memorization, students build a better foundation for learning. The text takes the reader from simple, one-factor problems to complex, multiple-factor problems. This building-block approach helps the student learn in a proven, systematic way. Using the UNIT PATH graphic, dimensional analysis problem-solving is presented in a clear, step-by-step format. Frequent `Thinking Through the Problem' HINTS provide special guidance for clarifying the critical thinking process. Two chapters are devoted to self-evaluation, allowing students to test their knowledge. A separate chapter of case studies illustrates the use of dosage calculation in the `real world'. Special features include chapter objectives, liberal examples, actual drug labels, many opportunities to practice, and a detailed answer key.