Substance use disorder refers to the condition of using one or more substances which cause impairment or distress. It is also known as drug use disorder. These substances include alcohol, caffeine, cannabis, hallucinogens, such as inhalants, opioids, sedatives, hypnotics, stimulants, tobacco, etc. Some of the mental, behavioral and physical symptoms of the disorder are loss of control, strain in life, tremors, sweating, etc. The treatment and management of this type of disorder cane be done through three major ways - detoxification, drug rehabilitation therapy and medication assisted treatment. The topics covered in this extensive book deal with the core subjects of substance use disorders. This book brings forth some of the unexplored concepts related to the assessment and treatment of substance use disorders. Coherent flow of topics, student-friendly language and extensive use of examples make this book an invaluable source of knowledge.