This document discusses different types of drugs, their classification, effects, and factors related to drug abuse. It covers prescriptive and over-the-counter drugs, common drug administration routes, drug effects categories, legal drug categories, commonly abused drugs like narcotics, hallucinogens, and stimulants. The document also discusses factors that can lead to drug abuse like association, experimentation, habituation, and dependence. It outlines several groups of drug abusers and the general physical, psychological, social, mental, and economic effects of drug abuse.