Amphetamine is a synthetic compound classified as a central nervous system stimulant. In controlled doses it can improve attention and focus, promote wakefulness and suppress appetite. Because of these effects, amphetamine and related substances are used both in medicine and, at times, outside of clinical contexts.

How it works and main effects

At the cellular level amphetamine increases the release and blocks the reuptake of monoamine neurotransmitters, especially dopamine and norepinephrine, in the brain. This rise in synaptic monoamines produces elevated alertness, concentration and, for some users, a sense of euphoria. Common acute effects include increased heart rate, pupil dilation, reduced need for sleep and diminished appetite. It is chemically related to methamphetamine, which has similar actions but differs in potency and pharmacological profile.

Medical uses

Several amphetamine-based preparations are approved for medical conditions. Licensed prescription medications that contain amphetamine salts or enantiomers are among standard treatments for ADHD, where they can improve attention and reduce impulsivity. Other recognized indications include severe daytime sleepiness such as in narcolepsy and, in some rehabilitation settings, as an adjunct to recovery after traumatic brain injury. Historically, amphetamine was also prescribed for appetite suppression and short-term weight control, though such uses have become much less common due to safety concerns.

Forms, administration and recreational use

Amphetamine is available in oral tablets, extended-release capsules and, illicitly, as powders and other formulations. Branded pharmaceutical examples include mixed salts and single-enantiomer products; street forms are commonly known by slang names such as “speed” or “bennies.” Routes of use affect intensity and risk: oral therapeutic use is generally safer than insufflation, injection or smoking of unregulated material. Some people use amphetamine to enhance performance or for recreation, which increases the risk of dependence and adverse health events.

Short-term risks include agitation, anxiety, cardiovascular strain and reduced sleep. Long-term or heavy use can lead to tolerance, psychological dependence, cognitive difficulties and, in some cases, stimulant-induced psychosis. Abrupt cessation after regular use may cause a rebound of fatigue and depressive mood. Legal status varies by country; some forms are tightly controlled while pharmaceutical formulations are available by prescription. Information on pricing and availability differs widely between regions and markets.

History and notable distinctions

Amphetamine was first synthesized in the late 19th and early 20th centuries and entered medical use in the 1930s under brand names such as Benzedrine. Its popularity expanded during and after World War II for a variety of clinical and non-medical purposes. Important distinctions exist between amphetamine and closely related stimulants: for example, methamphetamine is structurally similar but often more potent and carries a different risk profile. Contemporary practice emphasizes measured therapeutic use, monitoring, and harm reduction to limit misuse and adverse outcomes.

  • Common acute effects: increased wakefulness, reduced appetite, improved concentration, possible reduced fatigue.
  • Common risks: cardiovascular strain, dependence, sleep disruption, mood changes.
  • Clinical oversight: dosing, formulation and monitoring minimize risks in medical treatment.

For further general information and resources consult medical guidance and local regulations or follow authoritative health links: overview, stimulant class, attention effects, appetite, fatigue, related compounds, dopamine, norepinephrine, rewards, prescriptions, ADHD, TBI, narcolepsy, slang and market factors.