The document discusses substance abuse and alcohol dependence. It defines key terms like substance abuse, addiction, dependence, and withdrawal. It covers the ICD-10 classification of substance use disorders and commonly abused substances. It discusses the etiology of substance abuse from biological, behavioral, psychological, and social perspectives. It provides details on the stages of alcoholism, clinical features of alcohol dependence, and psychiatric disorders caused by alcohol like acute intoxication, withdrawal syndrome, amnestic disorders, and mood disorders. It also covers relapse in alcohol dependence and complications of long-term alcohol abuse.