It also depends on the environment in which the drug is used - for example, whether the person is alone, with others, or at a party. Heart rate, breathing and blood pressure increase. A dry mouth, increased sweating, enlargement of the eye's pupils and headaches may occur. Other effects include feeling wide-awake and alert, becoming talkative, restless, excited, and having difficulty sleeping. Panic attacks may also be experienced.
Some users become anxious, irritable, hostile and aggressive.
Sometimes people feel a sense of power and superiority over others. Most amphetamines sold illegally contain a mixture of pure amphetamines and other substances such as sugar, glucose, bi-carb soda, and ephedrine. These additives can be very poisonous. They can cause collapsed veins, tetanus, abscesses, and damage to the heart, lungs, liver and brain. And because the user doesn't know whether they are using 5 per cent or 50 per cent pure amphetamines, it is easy to accidentally overdose.