A drug class is typically defined by a prototype drug, the most important, and typically the first developed drug within the class, used as a reference for comparison. Having a pharmacology drug classification chart as a quick reference can make memorization easier and improve understanding of how different drugs work. To help you master pharmacology, we’ve created a drug classification PDF that breaks down must-know medications in an easy-to-follow format. Drugs, substances, and certain chemicals used to make drugs are classified into five (5) distinct categories or schedules depending upon the drug’s acceptable medical use and the drug’s abuse or dependency potential. Learn about drug classifications with clear explanations and examples. Understand how drugs are grouped by use, action, structure, and legal status. This guide shows how substances and drugs are classified by their effect, use, addiction potential, what drug type they fall under, and their legal classification. Drugs made from naturally occurring and synthetic substances that combat bacterial infection. Some antibiotics are effective only against limited types of bacteria. A drug class is a group of medications that share something important in common: they treat the same condition, work in the body the same way, or have a similar chemical makeup. Explore our detailed drug classification chart with simple explanations. Learn how drugs are grouped by purpose, name endings, legal schedules, and how they work in the body. Search or browse a complete list of drugs marketed in the U.S. organized by class or chemical type. Learn how drugs are grouped by their effects on the body, from depressants and stimulants to opioids and hallucinogens, plus how U.S. law schedules them.