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Methamphetamine, also called meth or crystal meth, among other names, is a psychostimulant drug mainly known for its recreational use. Methamphetamine is chemically similar to amphetamine, a drug used to treat attention-deficit hyperactivity disorder, obesity and narcolepsy; but being more potent and highly addictive, methamphetamine is rarely prescribed for medical treatments. Most commonly, the drug is produced illegally, from pseudoephedrine, an ingredient in cold medicines. It can exist as white powder, pills, or bluish-white crystals, and can be consumed by swallowing, smoking, snorting, or injecting. Methamphetamine acts to increase the amount of a neurotransmitter called dopamine in the brain. Dopamine is at the basis of the brain reward pathway, which is designed to reward the body for important behaviors that are essential for survival, such as feeding when hungry. Engaging in enjoyable activities causes dopamine release from dopamine-producing neurons into a space between n
