Amphetamines are classified as a stimulant. They work by increasing levels of norepinepherine, serotonin, and dopamine in the brain. Amphetamines are present in ADD medications. It was originally designed as a weight loss drug. It is also commonly used in colleges and high schools as studying and test taking aids. The physical effects of amphetamines are include reduced appetite, increased/distorted sensations, hyperactivity, dilated pupils, flushing, restlessness, dry mouth, erectile dysfunction, headache, tachycardia, increased breathing rate, increased blood pressure, fever, sweating, diarrhea, constipation, blurred vision, impaired speech, dizziness, uncontrollable movements or shaking, insomnia, numbness, palpitations, and arrhythmia. The psychological effects are anxiety and/or general nervousness euphoria, metacognition, creative or philosophical thinking, perception of increased energy, increased sense of well being, increase of goal-orientated thoughts or organized behavior, repetitive behavior, increased concentration/mental sharpness, increased alertness, feeling of power or superiority, emotional lability, excitability, talkativeness, an increased expression of aggression or paranoia. Amphetamines are also very addictive.

Amphetamines. Wikipedia