Abusers may also sniff the powdered crystals or make a solution and inject it. Amphetamines increase heart and breathing rates and blood pressure, dilate pupils, and decrease appetite. Users also experience a dry mouth, sweating, headache, blurred vision, dizziness, sleeplessness, and anxiety. Extremely high doses can cause rapid or irregular heartbeat, tremors, loss of coordination, and physical collapse. Sudden increases in blood pressure can cause death from stroke, very high fever, or heart failure.
Users report feeling restless, anxious, and moody.
Higher doses may make the user excited and talkative, providing a false sense of self-confidence and power. The paranoia sometimes results in extreme mood swings and violent outbursts. Long-term heavy use of amphetamines can lead to malnutrition, skin disorders, ulcers, and various diseases that come from vitamin deficiencies. Lack of sleep, weight loss, and depression also result from regular use. Frequent use of large amounts of amphetamines can produce brain damage that results in speech and thought disturbances Use of methamphetamines during pregnancy may result in severe harm to the developing fetus.