Amphetamines and methamphetamine

Speed, ice, crystal, “chems”: stimulants that keep a person awake for days, paid for in sleep, teeth and mental health.

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Where the substance comes from

These are synthetic products made from precursors diverted from the chemical or pharmaceutical industry — hence the tight control of some cold remedies in several countries. European speed is a heavily cut paste or powder, often below 20 % purity. Methamphetamine, far stronger and longer lasting, circulates as crystal and is advancing in Europe after dominating North America and East Asia.

A little history

Amphetamine was synthesised in 1887 in Berlin by the Romanian chemist Lazăr Edeleanu, with no use in mind; methamphetamine in 1893 in Japan by Nagai Nagayoshi, from ephedrine, and obtained in crystalline form in 1919. It was not until 1932 that an American company, Smith, Kline & French, marketed amphetamine as a nasal decongestant, Benzedrine, whose stimulant effect was soon noticed.

A pharmacist in a white coat arranges small glass bottles on the counter of a 1930s pharmacy
Amphetamine was first sold in pharmacies as a nasal decongestant.

The Second World War made it a mass product: the Wehrmacht handed out tens of millions of Pervitin (methamphetamine) tablets to its soldiers, the Allies Benzedrine, Japan Philopon — and Japan experienced, from 1945, the first epidemic of stimulant dependence. In the 1950s and 1960s amphetamines were prescribed for fatigue, depression and weight loss, then strictly controlled by the 1971 UN convention.

They came back in other forms: clandestinely made methamphetamine, which ravaged rural America in the 1990s and 2000s and then South-East Asia, where it is now produced by the hundred tonnes; captagon (fenethylline, synthesised in 1961), which became the drug of the Middle East; and, on prescription, the treatments for attention deficit disorder, whose misuse by students is the modern face of the story.

The forms it takes

What the user is looking for

Prolonged wakefulness, hunger and sleep gone, a sense of mental speed, confidence, physical endurance. In sexual settings (chemsex), methamphetamine is sought for longer sex and lowered inhibition. The effect lasts far longer than cocaine, which shifts the problem: the dose is not what is dangerous, the sleepless night that follows is, and the ones after it.

Immediate unwanted effects

Medium and long-term risks

Marked psychological dependence, deep depression on stopping, lasting insomnia. The dental damage of methamphetamine is characteristic — dry mouth, bruxism, sugary snacking and abandoned hygiene destroy teeth quickly. Add weight loss, skin lesions from picking, cardiac problems and a lasting risk of psychotic relapse. Injecting carries the infection risks of any injection.

How to spot use

Through a half-open door, a young man sleeps fully dressed in the middle of the afternoon, curtains drawn
Whole nights without sleep followed by days of recovery: a sign to watch for.

Whole nights without sleep followed by recovery days, rapid weight loss, picking sores on face and arms, clenched jaw, fast and suspicious speech, glass pipes, straws, extreme jumpiness. Urine detection: two to four days, longer for methamphetamine.

Why the effect is stronger in adolescents

A doctor shows brain scans to a young man and his mother
In adolescents, the reward circuit matures long before the prefrontal cortex that should restrain it: the urge to repeat is stronger and control is weaker.

At the same dose in a lighter body, the concentration reached is higher in an adolescent than in an adult. More importantly, the reward circuit matures well before the prefrontal cortex that is supposed to restrain it: the pull to repeat is stronger and the brake weaker, which markedly shortens the gap between first use and problem use. Use established before eighteen multiplies the risk of adult dependence whatever the substance — including legal ones such as the caffeine in energy drinks, alcohol or nicotine.

When to call an ambulance without hesitating

Loss of consciousness, seizures, severe confusion, slow or irregular breathing, blue lips, chest pain, very high temperature, uncontrollable agitation, suicidal thoughts. In those situations call the emergency services and say what was taken: treatment depends on it.

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Sources

  1. Methamphetamine — National Institute on Drug Abuse, United States (NIDA), 2024
  2. Legal Requirements for the Sale and Purchase of Drug Products Containing Pseudoephedrine, Ephedrine, and Phenylpropanolamine — fda.gov, 2024
  3. America's First Amphetamine Epidemic 1929–1971: A Quantitative and Qualitative Retrospective With Implications for the Present — pmc.ncbi.nlm.nih.gov, 2008
  4. Exponential rise in synthetic drug production and trafficking in the Golden Triangle — news.un.org, 2025
  5. Drug Misuse and Addiction — National Institute on Drug Abuse, United States (NIDA), 2020
  6. The Teen Brain: 7 Things to Know — nimh.nih.gov, 2023

Official or institutional documents this page relies on, consulted on 12 October 2026. Links open in a new tab.

Page checked in . The instruments cited can change: if in doubt, confirm with the official source given.

Text prepared with artificial intelligence, reviewed and checked by the AffectionPlus team (method and sources: About). This content does not replace medical or legal advice. Spotted an error? Write to us.

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