Effects Small doses of amphetamines can make you feel alert and energetic. They can increase your breathing and heart rates, decrease your appetite, and dilate your pupils. They can cause a dry mouth and sleeping problems. At higher doses, you can experience euphoria. Side effects include restlessness, shakiness, sweating, anxiety, headache, blurred vision, dizziness, irregular heartbeat and chest pain.
Some users experience feelings of power and superiority.
Some become hostile and aggressive. Overdose can cause delusions, hallucinations, high fever, delirium, seizures, coma, stroke, heart failure and death. Use with alcohol and other drugs is especially dangerous. If you use amphetamines regularly, you can have chronic sleep problems, depression, mood swings, irregular heartbeat, high blood pressure, weight loss, constipation or diarrhea, and nutritional problems. High doses of the drug can result in nerve damage, chronic psychosis, paranoia, and hallucinations.