Description

Methamphetamine(Crystal Meth) is a powerful,  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.
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People can take methamphetamine by:

By smoking
swallowing (pill)
snorting
injecting the powder that has been dissolved in water/alcohol

Because the “high” from the drug both starts and fades quickly, people often take repeated doses in a “binge and crash” pattern. In some cases, people take methamphetamine in a form of binging known as a “run,” giving up food and sleep while continuing to take the drug every few hours for up to several days.
How does methamphetamine affect the brain?

Methamphetamine increases the amount of the natural chemical dopamine in the brain. Dopamine is involved in body movement, motivation, and reinforcement of rewarding behaviors. The drug’s ability to rapidly release high levels of dopamine in reward areas of the brain strongly reinforces drug-taking behavior, making the user want to repeat the experience.
Short-Term Effects

Taking even small amounts of methamphetamine can result in many of the same health effects as those of other stimulants, such as cocaine or amphetamines. These include:

increased wakefulness and physical activity
decreased appetite
faster breathing
rapid and/or irregular heartbeat
increased blood pressure and body temperature