Methamphetamine is a very addictive stimulant drug that is closely related to amphetamine.
One option that is sometimes used to avoid opiate withdrawal is to replace the individual's drug of choice with methadone, a long-acting, cross-tolerant opiate that does not normally produce a "high."
Use of amphetamines can cause psychological effects which can include a feeling of well-being and great alertness and energy.
Regular users of anabolic steroids can experience paranoia, jealousy, delusions, and impaired judgment stemming from feelings of invincibility.