This document provides definitions and information about different types of drugs and their effects on the body. It defines drugs, medicines, antibiotics, side effects, tolerance, prescription medicines, and over-the-counter medicines. It also categorizes stimulants like amphetamines, cocaine, and crack as drugs that increase activity, and lists some of their negative health effects. Depressants like tranquilizers, barbiturates, and hypnotics are defined as drugs that decrease vital functions, along with how they are taken and some of their brand names.