noun
a synthetic drug that stimulates the central nervous system, used to treat conditions such as narcolepsy and attention deficit hyperactivity disorder
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The doctor prescribed amphetamine to treat the patient's narcolepsy.
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I heard that some people use amphetamine to stay awake during exams.
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I can't believe he's still taking that amphetamine stuff, it's so dangerous.
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The project deadline was approaching fast, so they needed an amphetamine-like boost to get it done on time.