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. 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. Learn about drug classifications with clear explanations and examples. Understand how drugs are grouped by use, action, structure, and legal status. 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. Drugs made from naturally occurring and synthetic substances that combat bacterial infection. Some antibiotics are effective only against limited types of bacteria. It encompasses the study of drugs, their mechanisms, therapeutic uses, and interactions within the human body. In this article, we’ll delve deep into various drug classes, their primary functions, and their applications in treating diseases. Search or browse a complete list of drugs marketed in the U.S. organized by class or chemical type. 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. 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. Drug classifications refer to the Drug Enforcement Administration's scheduling of drugs based on their abuse potential, medical use, and other criteria. Learn what the different schedules of drugs are and get examples of drugs in each schedule.