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Individuals with drug use disorders (DUDs) use all types and combinations of illicit and legal or prescription drugs. Many people use drugs prescribed to family members, friends, or others that they purchase or that are given to them. And many drink alcohol in addition to using drugs.

Legal drugs include alcohol, nicotine, caffeine, and prescription stimulants (Adderall, Concerta, Ritalin), opioids and morphine derivatives (codeine, morphine, methadone, fentanyl, and pain relievers—OxyContin, Percodan, and Vicodin), and depressants and anxiolytics (barbiturates, benzodiazepines, and hypnotics). Illicit or street drugs include cannabis (marijuana, hashish—legal in some states), stimulants (cocaine and crack cocaine, amphetamine, methamphetamine), heroin and opium, hallucinogens and related drugs (LSD, mescaline, psilocybin, Salvia), inhalants (spray paints, markers, glues, cleaning fluids), phencyclidine (PCP), and a variety of synthetic drugs ...

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