Methamphetamine is a powerful stimulant. It's like amphetamine, which doctors use to treat sleep problems (narcolepsy), attention deficit hyperactivity disorder (ADHD), and severe overweight problems. The illegal form of methamphetamine is a white, odorless, bitter-tasting, crystalline powder that can be dissolved easily in water or alcohol. It is called speed, meth, ice, crystal, glass, or chalk. The smoked form of methamphetamine is often called ice, crystal, crank, or glass. Illegal methamphetamine is often made in makeshift laboratories from inexpensive ingredients.
Methamphetamine can be smoked, snorted, swallowed, or injected. When it is smoked or injected, the person feels an intense pleasurable rush that lasts only a few minutes. The smokable form produces an odorless smoke that leaves a residue that can be smoked again, allowing the person to experience effects of the drug for up to 12 hours or more. When it is snorted or taken by mouth, the person feels happy (euphoric) but does not have the intense rush obtained from smoking or injecting the drug. People who use this drug have a tendency to use it repeatedly (binge) and then crash afterward.
In small doses, methamphetamine can increase wakefulness and physical activity and decrease appetite. In high doses, it can increase body temperature to dangerous—and possibly deadly—levels, as well as cause seizures. Because methamphetamine increases heart rate and blood pressure, it can permanently damage blood vessels in the brain, causing a stroke. People who use methamphetamine may become anxious, confused, and violent. They may develop serious psychological effects, such as paranoia, seeing or hearing things that are not present (hallucinations), and believing things that are not true (delusions).
Methamphetamine use can lead to stimulant use disorder. If use is stopped, it can lead to depression, anxiety, and paranoia. Also, the person usually has strong cravings for the drug.
Methamphetamine's high lasts from 8 to 24 hours. The drug can be detected in a urine drug screen up to 48 hours after use.
Signs of use
- Long periods of time without eating or sleeping
- Weight loss
- Agitated behavior, excited speech, irritability, nervousness, and increased physical activity
- Wide pupils and increased pulse rate
- Dental problems
- Personality changes
Current as of: February 11, 2021
Author: Healthwise Staff
Patrice Burgess MD - Family Medicine
Adam Husney MD - Family Medicine
Martin J. Gabica MD - Family Medicine
Christine R. Maldonado PhD - Behavioral Health
Kathleen Romito MD - Family Medicine
Michael F. Bierer MD - Internal Medicine, Addiction Medicine