At normal therapeutic doses, the most common psychological side effects of amphetamine include increased alertness , apprehension, concentration , initiative, self-confidence , and sociability, mood swings ( elated mood followed by mildly depressed mood ), insomnia or wakefulness , and decreased sense of fatigue.   Less common side effects include anxiety , change in libido , grandiosity , irritability , repetitive or obsessive behaviors, and restlessness; [sources 4] these effects depend on the user's personality and current mental state.  Amphetamine psychosis (., delusions and paranoia ) can occur in heavy users.    Although very rare, this psychosis can also occur at therapeutic doses during long-term therapy.    According to the USFDA, "there is no systematic evidence" that stimulants produce aggressive behavior or hostility. 
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