Amphetamines release stores of norepinephrine and dopamine from nerve endings by converting the respective molecular transporters into open channels. Amphetamine also releases stores of serotonin from synaptic vesicles when taken in relativly high doses. This effect is more pronounced in methamphetamine use. Like methylphenidate (Ritalin), amphetamines also prevent the monoamine transporters for dopamine and norepinephrine from recycling them (called reuptake inhibition), which leads to increased amounts of dopamine and norepinephrine in synaptic clefts.

These combined effects rapidly increase the concentrations of the respective neurotransmitters in the synaptic cleft, which promotes nerve impulse transmission in neurons that have those receptors.

Physical effects
Short-term physiological effects vary greatly, depending on dosage used and the method in which the drug is taken. These effects could include decreased appetite, increased stamina and physical energy, increased sexual drive/response, involuntary bodily movements, hyperhidrosis, hyperactivity, jitteriness, nausea, itchy, blotchy or greasy skin, tachycardia, irregular heart rate, hypertension, and headaches. Fatigue can often follow the dose's period of effectiveness. Overdose can be treated with chlorpromazine.
Long-term abuse or overdose effects can include tremor, restlessness, changed sleep patterns, anxiety and increase in pre-existing anxiety, poor skin condition, hyperreflexia, tachypnea, gastrointestinal narrowing, and weakened immune system. Fatigue and depression can follow the excitement stage. Erectile dysfunction, heart problems, stroke, and liver, kidney and lung damage can result from prolonged abuse. When insufflated, amphetamine can lead to a deterioration of the lining of the nostrils.

Psychological effects
Short-term psychological effects can include alertness, euphoria, increased concentration, rapid talking, increased confidence, increased social responsiveness, nystagmus (eye wiggles), hallucinations, and loss of REM sleep the night after use.
Long-term Amphetamine abuse can induce psychological effects that include insomnia, mental states resembling schizophrenia, aggressiveness (not associated with schizophrenia), addiction or dependence with accompanying withdrawal symptoms, irritability, confusion, and panic. Chronic and/or extensively-continuous use can lead to amphetamine psychosis, which causes delusions and paranoia, but this is uncommon when taken as prescribed. The abuse of an Amphetamine is highly-psychologically addictive, and, with chronic abuse, tolerance develops very quickly. Withdrawal is, although not physiologically threatening, an unpleasant experience (including paranoia, depression, difficult breathing, dysphoria, gastric fluctuations and/or pain, and lethargia). This commonly leads chronic users to re-dose amphetamine frequently, explaining tolerance and increasing the possibility of addiction.

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