Amphetamine is a central nervous system stimulant used to treat ADHD, narcolepsy, and obesity. It exists as two forms, levoamphetamine and dextroamphetamine, and is prescribed orally as tablets, liquids, or orally disintegrating tablets. Amphetamine increases neurotransmitters like norepinephrine and dopamine in the brain by releasing them from nerve terminals. Common side effects include insomnia, anxiety, irritability, and weight loss. Nurses monitor patients taking amphetamine for vital signs, adverse effects, weight changes, and drug interactions.