What are the effects of Amphetamine (disambiguation)?

The subjective effects of Amphetamine (disambiguation) are primarily characterized by increased energy, alertness, motivation, and mood elevation, with significant variation based on dose, route of administration, and individual sensitivity. Cognitive Effects Users report enhanced focus and concentr

What are the risks of Amphetamine (disambiguation)?

Acute Toxicity Amphetamine has moderate acute toxicity compared to some drug classes. The primary acute risks at recreational doses are: Cardiovascular: Tachycardia, hypertension, arrhythmias — meaningful risk in those with cardiovascular disease Hyperthermia: Particularly in exercise or hot environ

Amphetamine (disambiguation)

Stimulants

Amphetamine refers to several related but distinct concepts that are frequently conflated in casual discussion, clinical contexts, and search queries. This page disambiguates the major uses of the term.

Amphetamine (the specific compound): The base compound amphetamine — alpha-methylphenethylamine — is a monoamine releasing agent and reuptake inhibitor used pharmaceutically as Adderall (mixed amphetamine salts), Evekeo (racemic amphetamine), and Dyanavel (amphetamine sulfate). It is prescribed for attention deficit hyperactivity disorder (ADHD), narcolepsy, and in limited clinical contexts for obesity. The compound exists as two enantiomers: dextroamphetamine (d-amphetamine, more potent CNS stimulant) and levoamphetamine (l-amphetamine, more prominent peripheral sympathomimetic effects). Adderall contains a 75:25 d:l mixture.Amphetamines (the drug class): "Amphetamine" is colloquially used to refer to the broader phenethylamine/amphetamine chemical class, including methamphetamine, lisdexamfetamine (Vyvanse), dextroamphetamine (Dexedrine), and numerous related compounds. This usage is common in clinical documentation ("amphetamine-type stimulants") and media coverage."Speed": Amphetamine (or methamphetamine) sulfate powder sold on recreational drug markets — sometimes referred to simply as "amphetamine" in European contexts where methamphetamine is less common.

Users searching for "amphetamine" may be looking for: their prescribed ADHD medication (Adderall, Vyvanse); information about the recreational drug; pharmacological information about the compound class; harm reduction information; or information about specific amphetamine analogs. This disambiguation page links to all relevant specific entries.

History

Discovery and Early Pharmaceutical History

Amphetamine was first synthesized by Romanian chemist Lazăr Edeleanu in 1887 as part of research on phenethylamine compounds. It attracted little attention until 1927, when pharmacologist Gordon Alles — searching for an asthma treatment to replace ephedrine — independently resynthesized amphetamine and documented its powerful stimulant properties. Smith, Kline and French licensed Alles's discovery and marketed amphetamine as Benzedrine — an OTC inhalant for nasal congestion. Benzedrine inhalers were widely abused for their stimulant properties from their introduction in 1933.

World War II and Mass Use

Amphetamine became a strategic military pharmacological tool during World War II. All major combatant powers issued amphetamines to their soldiers — Benzedrine in the UK and US, Pervitin (methamphetamine) in Germany, and Philopon (methamphetamine) in Japan. Millions of combat doses were issued; the drugs reduced fatigue, maintained alertness on extended missions, and suppressed fear. This wartime use established the template for amphetamine's relationship with productivity and performance that persists today.

Post-War Epidemics and Regulation

Post-war Japan experienced the first major methamphetamine epidemic as military stocks were released into civilian markets. The United States and UK saw waves of amphetamine misuse through the 1950s–1970s. The Controlled Substances Act of 1970 placed amphetamine in Schedule II — recognized medical uses but with high abuse potential — where it remains. Despite scheduling, pharmaceutical amphetamine prescriptions have grown substantially in the 21st century alongside rising ADHD diagnosis rates.

Contemporary Status

Pharmaceutical amphetamine is among the most widely prescribed controlled substances in the United States — Adderall and Vyvanse prescriptions numbered in the tens of millions by the 2020s. Concurrently, non-medical amphetamine use remains prevalent globally. The coexistence of therapeutic acceptance and recreational harm reduction continues to define the amphetamine policy landscape.

Harm Reduction

For People Prescribed Amphetamines

Pharmaceutical amphetamine (Adderall, Vyvanse, Dexedrine) is generally safe and effective when taken as prescribed under medical supervision. Key considerations:

Take only as prescribed — Dose escalation outside medical supervision increases risk without additional therapeutic benefit and accelerates tolerance
Holidays: Many prescribers recommend periodic "drug holidays" (weekends, summers) to allow tolerance to reset and to assess baseline functioning
Sleep and nutrition: Amphetamine suppresses appetite and can disrupt sleep; maintaining adequate nutrition and sleep is important for long-term wellbeing
Cardiovascular monitoring: Blood pressure and heart rate should be monitored periodically, especially in older patients or those with cardiovascular risk factors

For Recreational Amphetamine Use

Test your substance: Street "speed" in the UK/Europe may contain amphetamine sulfate, but also frequently contains methamphetamine, cathinones, or other stimulants. Reagent testing (Marquis: orange/brown for amphetamines) provides partial confirmation.
Redosing drives most harms: Set a limit before you start. The comedown creates strong motivation to redose, but each redose extends the duration, deepens the eventual crash, and increases cardiovascular load.
Stay hydrated and cool: Amphetamine increases body temperature and reduces thirst perception. Drink water regularly in warm environments.
Eat and sleep before using: Depleted states make adverse effects more likely and the subsequent crash more severe.
Avoid MAOIs: Combining amphetamines with any MAOI is potentially lethal.

Tolerance, Dependence, and Getting Help

Tolerance to amphetamine's desired effects develops within days of daily use. If you are using daily or finding it difficult to stop, addiction medicine and harm reduction services can provide non-judgmental support. ADHD-prescribed amphetamine misuse often indicates undertreated ADHD that could be better managed therapeutically.

Toxicity & Safety

Acute Toxicity

Amphetamine has moderate acute toxicity compared to some drug classes. The primary acute risks at recreational doses are:

Cardiovascular: Tachycardia, hypertension, arrhythmias — meaningful risk in those with cardiovascular disease
Hyperthermia: Particularly in exercise or hot environments; potentially fatal at extreme temperatures
Amphetamine psychosis: Paranoid ideation, tactile hallucinations, and thought disorder occur with high doses or extended use; typically resolves with abstinence

Chronic Toxicity

Neurotoxicity: Long-term heavy amphetamine (particularly methamphetamine) use produces documented changes in dopaminergic and serotonergic terminal structure and function in the striatum and prefrontal cortex. These changes partially reverse with extended abstinence.
Cognitive effects: Chronic heavy use impairs working memory, attention, and executive function — a paradox given therapeutic use in ADHD, where these same domains are targeted
Cardiovascular: Chronic hypertension, arterial stiffness, cardiomyopathy with sustained high-dose use
Dependence: Physical tolerance and psychological dependence develop with regular use; withdrawal produces significant dysphoria, hypersomnia, increased appetite, and depression

Therapeutic Use vs Recreational Use

At therapeutic doses (5–30 mg/day of mixed amphetamine salts for ADHD), the risk profile is substantially more favorable than at recreational doses. Decades of clinical use have established that appropriately dosed pharmaceutical amphetamine, taken as directed, does not produce the neurotoxicity associated with high-dose recreational use.

Drug Interactions

MAOIs: Absolute contraindication — risk of hypertensive crisis and serotonin syndrome
Lithium: May reduce amphetamine effects; complex interaction
Antacids: Alkalinize urine, increasing amphetamine absorption and reducing renal clearance; can elevate plasma levels
Haloperidol and other antipsychotics: Reduce amphetamine's CNS effects through dopamine receptor blockade

Overdose Information

Stimulant overdose from Amphetamine is a medical emergency primarily involving cardiovascular and neurological toxicity.

Signs of overdose: Extremely rapid or irregular heartbeat, chest pain, severe headache, dangerously elevated body temperature, seizures, agitation progressing to psychosis, confusion, and loss of consciousness.Emergency response:

Call emergency services immediately
Keep the person cool (remove excess clothing, apply cool water)
If seizures occur, protect the head and clear the area of hard objects
If the person loses consciousness, place in recovery position
Do not give the person more stimulants, caffeine, or depressants unless directed by medical professionalsPrevention: Pre-measure doses. Avoid redosing. Stay hydrated (but don't overhydrate). Take breaks from physical activity. Monitor heart rate if possible. Have someone present who can recognize warning signs.

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Amphetamine (disambiguation)

Dosage

Duration

Subjective Effects

Physical Effects

Physical(7)

Cognitive & Perceptual Effects

Cognitive(4)

Pharmacology

Core Pharmacological Mechanism

Enantiomers and Specific Compounds

Interactions

History

Discovery and Early Pharmaceutical History

World War II and Mass Use

Post-War Epidemics and Regulation

Contemporary Status

Harm Reduction

For People Prescribed Amphetamines

For Recreational Amphetamine Use

Tolerance, Dependence, and Getting Help

Toxicity & Safety

Acute Toxicity

Chronic Toxicity

Therapeutic Use vs Recreational Use

Drug Interactions

Overdose Information

Tolerance

Legal Status

Experience Reports (2)

Tips (3)

See Also

References (2)

Frequently Asked Questions