Have you finished your course in Pharmacology? Preparing for the USMLE or the NCLEX-RN? Are you a busy healthcare professional who wants to brush up your cognitive skills related to pharmacodynamics? Drugs are everywhere. We take it with or without a prescription. Have we stopped to think about the synergistic action or concurrent usage of these drugs that we are taking? Even OTC like NSAID, if not taken with meals or on a full stomach can cause GI ulceration. Concurrent use of MAOI with symmetrel may cause hypertensive crisis. There is a lot more to learn from these drugs. The intention of this book is to provide the simplest method of reviewing the major drugs that are prescribed and administered in the healthcare profession. It covers the specific drugs for the different body systems. It is presented with definitions, classes, pharmacodynamic, drug interactions, side effects, adverse reactions and healthcare responsibilities. There are pre tests, chapter quizzes and post tests. The author utilized the essential information from rigorous hours of research to prepare the reader for an examination or for review in general. The author also realized the need to divide each types of drugs in volumes to prevent overwhelming the reader.