Stimulants
Mephedrone (M-Cat / Meow Meow)
Street names: M-Cat, Meow meow, 4-MMC, Drone, Bubbles
Overdose? Act now. Call emergency services — say "unresponsive, not breathing". Give naloxone for opioid-like signs. Hotlines
⚡What it does
- Euphoria, empathy, energy — MDMA-cocaine hybrid
- Strong urge to redose
⚠Key risks
- Cardiovascular strain — racing heart, overheating
- Compulsive redosing drives days-long binges and psychosis
- Serotonin depletion crashes
- Frequently cut with caffeine, glucose, or worse
- UK's 2010 'legal high' epidemic before Class B scheduling
✚Overdose signs
- Racing irregular heartbeat
- Overheating, sweating
- Agitation, paranoia, seizures
📋Quick facts
Also known asM-Cat, Meow meow, 4-MMC, Drone, Bubbles
CategoryStimulants
Schedule / classSchedule I (US); Class B (UK)
AppearanceWhite/off-white powder or crystals; '4-MMC' crystal shards; capsules
Street price$15–$40/g; crystals $20–$50/g
Legal statusSchedule I US; Class B UK; controlled EU/AU
Last updated2026-09-17
Sources: EMCDDA, NIDA
Category comparison — Stimulants
| Substance | Class | Top risks | Street price |
|---|---|---|---|
| Mephedrone (M-Cat / Meow Meow) | Schedule I | Cardiovascular strain — racing heart, overheating; Compulsive redosing drives days-long binges and psychosis | $15–$40/g |
| MDMA | Schedule I | Overheating + dehydration (or fatal water intoxication); Serotonin depletion — multi-day comedown | ~$10–$40 per pill |
| 4-MMC crystals | Schedule I | Identical harms to mephedrone; 'crystal' purity claims are unverifiable | ~$20–$50 per gram |
Street prices are regional estimates. Potency and cuts vary constantly.
?Frequently asked questions
What does Mephedrone (M-Cat / Meow Meow) look like?
White/off-white powder or crystals; '4-MMC' crystal shards; capsules
What are the signs of a Mephedrone (M-Cat / Meow Meow) overdose?
Racing irregular heartbeat; Overheating, sweating; Agitation, paranoia, seizures Call emergency services immediately.
How addictive is it?
Cardiovascular strain — racing heart, overheating Dependence can develop with regular use.