The Amphetamine psychosis reference article from the English Wikipedia on 24-Apr-2004
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Amphetamine psychosis

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Amphetamine psychosis is the result of binging on amphetamine (usually methamphetamine) for days straight. Clinically, it is similar to paranoid schizophrenia. Sleep deprivation may also make the brain begins to make the user see "shadow people," commonly referred to as "The Meth Monster."

After being awake for about 3 days on methamphetamine, the user will begin to "Space Out." Since people without sleep are usually aggravated, a person using meth for long periods of time will be angry. Meth users commonly experience sudden and unpredictable temper tantrums after a few days of being awake.

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