noun
a powerful and highly addictive stimulant drug that affects the central nervous system
adjective
relating to or characteristic of methamphetamine
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The use of methamphetamine can have serious long-term effects on the brain and body.
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I heard that methamphetamine is a really dangerous drug that can mess you up.
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I can't believe he's still using meth, that stuff is no joke.
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His addiction to methamphetamine was like a dark cloud hanging over his life.