Although overdoses are rare, signs include a high body temperature and seizure. It can make people very combative, raise blood pressure, induce memory loss and cause flashbacks that can be permanent. Strokes or heart attacks may occur as a result. Users of amphetamines commonly cocaine, speed or prescription drugs often consume this drug to get extra energy. As a result, many can t sit still.
Users can become very aggressive.
Fanburg said the drug narrows the blood vessels, squeezing them, which can cause a heart attack, even in young people. Depressants, or downers, create an intense feeling of relaxation. Valium, for instance, makes people sleepy, Fanburg said. Movement becomes slower. When combined with alcohol another depressant the effects can be so strong that the user stops breathing.