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.
Safety at a Glance
High Risk- For People Prescribed Amphetamines
- Pharmaceutical amphetamine (Adderall, Vyvanse, Dexedrine) is generally safe and effective when taken as prescribed un...
- Toxicity: Acute Toxicity Amphetamine has moderate acute toxicity compared to some drug classes. The primary acute risks at recr...
- Overdose risk: Stimulant overdose from Amphetamine (disambiguation) is a medical emergency primarily involving c...
If someone is in crisis, call 911 or Poison Control: 1-800-222-1222
Duration
No duration data available.
Subjective Effects
The effects listed below are based on the Subjective Effect Index (SEI), an open research literature based on anecdotal reports and personal analyses. They should be viewed with a healthy degree of skepticism. These effects will not necessarily occur in a predictable or reliable manner, although higher doses are more liable to induce the full spectrum of effects.
Physical Effects
Physical(8)
- Appetite suppression— A distinct decrease in hunger and desire to eat, ranging from reduced interest in food to complete d...
- Dry mouth— A persistent, uncomfortable reduction in saliva production causing the mouth and throat to feel parc...
- Frequent urination— Increased urinary frequency beyond normal patterns, caused by diuretic effects or bladder irritation...
- Increased heart rate— A noticeable acceleration of heartbeat that can range from a subtle awareness of one's pulse to a fo...
- Muscle tension— Persistent partial contractions or tightening of muscles that produces uncomfortable stiffness, cram...
- Pupil dilation— A visible enlargement of the pupil diameter (mydriasis) that can range from subtle widening to drama...
- Serotonin syndrome— Serotonin syndrome is a potentially fatal medical emergency caused by excessive serotonergic activit...
- Teeth grinding— An involuntary clenching and rhythmic grinding of the jaw muscles, known clinically as bruxism, that...
Tactile(1)
- Tactile hallucination— Tactile hallucinations are convincing physical sensations experienced without any corresponding exte...
Cognitive & Perceptual Effects
Cognitive(6)
- Anxiety— Intense feelings of apprehension, worry, and dread that can range from a subtle background unease to...
- Depression— A persistent state of low mood, emotional numbness, hopelessness, and diminished interest or pleasur...
- Irritability— Irritability is a sustained state of emotional reactivity in which the threshold for annoyance, frus...
- Psychosis— Psychosis is a serious psychiatric state involving a fundamental break from consensus reality — char...
- Thought acceleration— The experience of thoughts occurring at a dramatically increased rate, as if the mind has been shift...
- Wakefulness— An increased ability to stay awake and alert without the desire to sleep. Distinct from stimulation ...
Pharmacology
Core Pharmacological Mechanism
All amphetamine-class compounds share the fundamental mechanism of monoamine system modulation, though with varying potency and selectivity across dopamine (DA), norepinephrine (NE), and serotonin (5-HT) systems.
Reuptake Inhibition: Amphetamines block the monoamine transporters (DAT, NET, SERT), preventing reuptake of released monoamines from the synapse and extending their duration of action.
Reverse Transport (Monoamine Release): More significantly, amphetamines enter presynaptic terminals via the transporters and interact with VMAT2 (vesicular monoamine transporter 2), causing efflux of monoamines from storage vesicles into the cytoplasm, followed by transporter-mediated efflux into the synapse. This non-exocytotic release produces a large, non-physiological surge of dopamine, norepinephrine, and (for substituted amphetamines like MDMA) serotonin.
MAO Inhibition: Amphetamine weakly inhibits monoamine oxidase, modestly extending monoamine availability.
Enantiomers and Specific Compounds
Dextroamphetamine (d-amphetamine): Greater CNS selectivity; stronger effects on DAT and NET; primary component of Dexedrine and Adderall; more reinforcing, more frequently subject to misuse.
Levoamphetamine (l-amphetamine): Greater peripheral sympathomimetic activity (cardiovascular); weaker CNS effects. Present in Adderall as the minority enantiomer.
Lisdexamfetamine (Vyvanse): Prodrug; lysine conjugate of d-amphetamine; requires enzymatic cleavage for activation; oral bioavailability only (enzymatic activation in gut/blood, not if insufflated); smoother onset; lower abuse potential than immediate-release amphetamine.
Methamphetamine: N-methyl analog; greater CNS penetration; more potent than amphetamine at equivalent doses; greater dopamine release relative to NE; longer duration.
Interactions
No documented interactions.
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 professionals
Prevention: 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.
Tolerance
| Full | Unknown |
| Half | Unknown |
| Zero | Unknown |
Legal Status
The legal status of Amphetamine varies by jurisdiction and is subject to change. This information is provided for educational purposes and may not reflect the most current legislation.
General patterns: Many psychoactive substances are controlled under national and international drug control frameworks, including the United Nations Single Convention on Narcotic Drugs (1961), the Convention on Psychotropic Substances (1971), and country-specific legislation such as the US Controlled Substances Act, UK Misuse of Drugs Act, and EU Framework Decisions.
Research chemicals and analogues: Novel psychoactive substances may be captured by analogue laws (e.g., the US Federal Analogue Act) or blanket bans on substance classes (e.g., the UK Psychoactive Substances Act 2016), even if the specific compound is not individually scheduled.
Important note: Possessing, distributing, or manufacturing controlled substances carries serious legal consequences in most jurisdictions. Legal status is not a reliable indicator of a substance's safety profile — some highly dangerous substances are legal, while some with favorable safety profiles are strictly controlled.
Users are strongly encouraged to research the specific legal status of Amphetamine in their jurisdiction before any involvement with this substance.
Experience Reports (1)
Tips (3)
Keep a usage log for Amphetamine (disambiguation) including dose, time, effects, and side effects. This helps you identify patterns and prevent problematic escalation.
Always start with a low dose of Amphetamine (disambiguation) and work your way up. Individual sensitivity varies, and you cannot undo a dose once taken.
Research potential interactions before combining Amphetamine (disambiguation) with other substances. Drug interactions can be unpredictable and dangerous.
See Also
References (2)
- Amphetamine (disambiguation) - TripSit Factsheet
TripSit factsheet for Amphetamine (disambiguation)
tripsit - Amphetamine (disambiguation) - Wikipedia
Wikipedia article on Amphetamine (disambiguation)
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