Educational content. This article does not provide dosing, sourcing or buying information. In an emergency call 112 (EU), 999 (UK) or 911 (US).
Synthetic cathinones are stimulants chemically related to cathinone, the active ingredient of the khat plant, and to drugs such as mephedrone. Dozens have been sold as “research chemicals” or “bath salts”, including 3-MMC, 3-CMC, 2-MMC, 2-CMC, 4-CMC, 3-MEC, 4-CEC, 3-CEC, 3-FMC, 3,4-DMMC, NEP (N-ethylpentedrone), 4-MPD, eutylone, α-PHP and α-PiHP. Each time one substance was banned, a slightly modified version appeared to take its place.
How they affect the body
Cathinones increase the levels of dopamine, noradrenaline and serotonin in the brain, much like amphetamine, MDMA or cocaine. People take them for euphoria, energy and sociability, but the same mechanism strains the heart, raises body temperature and can trigger severe mental health effects.
Common side effects
- Racing heart, palpitations and high blood pressure
- Sweating, overheating and dehydration
- Jaw clenching, teeth grinding, dilated pupils
- Anxiety, agitation, paranoia and insomnia
- Strong urge to keep re-dosing
- Low mood and exhaustion in the days afterwards (“comedown”)
Serious dangers
The European Union’s drug agency assessed 3-MMC and 3-CMC in 2021 after a surge in supply. Member States had reported 27 deaths involving 3-MMC and 10 involving 3-CMC with confirmed exposure. The 3-CMC risk assessment lists effects including:
- Cardiovascular: fast heart rate, high blood pressure, chest pain and cardiac arrest.
- Overheating: heavy sweating, high body temperature and rapid breathing. Severe hyperthermia can lead to muscle breakdown and kidney failure.
- Neurological and psychiatric: agitation, aggression, hallucinations, psychotic episodes, reduced consciousness and seizures.
- Contamination: residues from crude production methods, such as manganese, can cause nerve damage with Parkinson-like symptoms.
For many cathinones, chronic toxicity and dependence potential have never been studied in humans. What is known about the class points to a high risk of compulsive use, and some, such as α-PHP and α-PiHP, are associated with particularly severe agitation and psychosis.
Mixing makes it worse
Cathinones are often combined with other drugs. Taking them with other stimulants (cocaine, amphetamine, MDMA) increases the strain on the heart and the risk of overheating. Alcohol and sedatives can mask how intoxicated someone is, encouraging more use. In “chemsex” settings, cathinones are sometimes combined with GHB/GBL, which carries a serious risk of loss of consciousness.
Injecting
Some people inject cathinones, often many times in one session. That brings risks of abscesses, vein damage and the spread of HIV and hepatitis C through shared equipment.
Warning signs of an emergency
- Chest pain, very fast or irregular heartbeat
- Very high temperature, confusion, not sweating despite being hot
- Severe agitation, paranoia or violent behaviour
- Seizures, collapse or unresponsiveness
Call emergency services, move the person somewhere cool and calm, and stay with them. Tell responders what may have been taken.
Legal status
The EU added 3-MMC and 3-CMC to its legal definition of “drug” in 2022, requiring all Member States to control them. Many other cathinones are internationally controlled. In the Netherlands, all phenethylamines including cathinones have been banned as a group since 1 July 2025, and the UK controls cathinones under a generic definition in the Misuse of Drugs Act.
Where to get help
- Emergency: 112 (EU), 999 (UK), 911 (US).
- Netherlands: Drugs Infolijn (drugsinfo.nl); anonymous drug testing via DIMS.
- UK: FRANK (talktofrank.com).
- US: SAMHSA National Helpline, 1-800-662-4357.
- Local addiction services and sexual health clinics, which often run specialist chemsex support.
Frequently asked questions
Is 3-MMC safer than mephedrone?
There is no evidence it is. It acts in a similar way and has been linked to deaths and serious poisonings.
Why do people keep re-dosing?
Cathinones often have a short-lived high followed by strong craving, which drives compulsive re-dosing and raises the risk of overdose.
Are cathinones legal anywhere?
Most are now controlled across Europe, the UK and the US, either individually or under group bans.
This article is for general information and does not replace medical advice.
