The National Institute on Drug Addiction (NIDA) defines methamphetamine as "a powerful, highly addictive stimulant that affects the central nervous system. Crystal methamphetamine is a form of the drug that looks like glass fragments or shiny, bluish-white rocks. It is chemically similar to amphetamine, a drug used to treat attention-deficit hyperactivity disorder (ADHD) and narcolepsy, a sleep disorder."

In this fact sheet, NIDA explains the affects meth has on the brain and the short and long term physical affects of meth abuse. They also answer commonly asked questions about methamphetamine overdose and treatment for meth addiction.

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