mental health disorders
Substance Use Disorders
Introduction
Substance use disorders generally involve behavior patterns in which people continue to use a substance (for example, a recreational drug) despite having problems caused by its use. The substances involved tend to be members of the 10 classes of drug that typically cause substance-related disorders: Alcohol Use None Misuse of Antianxiety Medications and Sedatives None Caffeine Cannabis (including Marijuana and Hallucinogens (including LSD, phencyclidine, psilocybin, 3,4-methyl​enedioxy​ Volatile Solvents (such as paint thinner and certain glues) Opioids (including Stimulants (including Amphetamines and None Other (including Anabolic Steroids and other commonly abused substances) The specific manifestations and treatment of intoxication and withdrawal vary by the substance or substance class and are discussed elsewhere in THE MANUAL. The common terms "addiction," "abuse," and "dependence" are too loosely and variably defined to be very useful in systematic diagnosis; "substance use disorder" is more comprehensive and has fewer negative connotations. 