Because it is such an additive drug, many users report being unable to stop after just one use. Short-term as well as long-term effects can occur.
Behavior changes could include psychotic behavior, paranoia, aggression, anxiety, fatigue, depression, delusions, mood swings, confusion, insomnia, and hallucinations.
An amphetamine-induced psychotic disorder often mimics schizophrenia, because people with both conditions often experience auditory, visual, and tactile hallucinations.
Health dangers include stroke, brain damage similar to Alzheimer’s disease, weight loss, and death.

(For more information on methamphetamine psychosis, go to http://www.rnceus.com/meth/methpsych.html.)