Methamphetamine is part of the group of drugs called amphetamine-type stimulants (ATS). It is a synthetic drug that is usually manufactured in illegal laboratories. Methamphetamine comes as a powder, tablet or as crystals that look like shards of glass.
Short-term, users can lose their appetite and start breathing faster. Their heart rate and blood pressure may increase and their body temperature may rise and cause sweating. With large doses, users can feel restless and irritable and can experience panic attacks. Excessive doses of methamphetamine can lead to convulsions, seizures and death from respiratory failure, stroke or heart failure.
Long-term methamphetamine use can lead to malnutrition, weight loss and the development of psychological dependence. Methamphetamine use sometimes triggers aggressive, violent and bizarre behavior among users.