Methamphetamine is a member of the amphetamine class of drugs that are widely known for their central nervous system stimulation effects. These drugs are generally used to treat attention-deficit hyperactivity disorder (ADHD), and were once widely used as appetite suppressants. They are also useful in the treatment of narcolepsy, a disease that leaves patients prone to sudden attacks of deep sleep. Unfortunately, amphetamines are among the most abused of all prescription drugs. Methamphetamine ranks at top of the list for abused amphetamines, and current trends to use this drug as a free base (ice) are leading to new problems in combating the war on drugs. Side effects of the amphetamines include irregular heartbeat, chest pain, fever, difficulty in breathing, dizziness, and increased blood pressure.