Stimulants
4-MMC crystals
Street names: Crystal meph, Mephedrone crystal
Overdose? Act now. Call emergency services — say "unresponsive, not breathing". Give naloxone for opioid-like signs. Hotlines
⚡What it does
- Identical to mephhedrone — euphoria, energy, empathy
⚠Key risks
- Identical harms to mephedrone; 'crystal' purity claims are unverifiable
✚Overdose signs
- Racing heart
- Overheating
- Severe agitation
📋Quick facts
Also known asCrystal meph, Mephedrone crystal
CategoryStimulants
Schedule / classSchedule I (US); Class B UK
AppearanceTranslucent/white crystalline shards sold as 'pure mephedrone'
Street price~$20–$50 per gram
Legal statusSame as mephedrone — illegal
Last updated2026-09-12
Sources: EMCDDA, NIDA
Category comparison — Stimulants
| Substance | Class | Top risks | Street price |
|---|---|---|---|
| 4-MMC crystals | Schedule I | Identical harms to mephedrone; 'crystal' purity claims are unverifiable | ~$20–$50 per gram |
| Cocaine | Schedule II | Heart attack/stroke even in young users; Severe addiction — craving cycle | ~$60–$120 per gram |
| Speed (amphetamine paste) | Schedule II | Insomnia, anxiety, paranoia; Heart strain and overheating | ~$10–$40 per gram |
| Methamphetamine | Schedule II | Addiction — among the most addictive drugs known; Meth mouth, skin sores, psychosis | ~$20–$100 per gram |
| Adderall (amphetamine salts) | Schedule II | Dependence and tolerance; Cardiovascular strain | ~$3–$15 per 30 mg tablet |
| Adderall XR | Schedule II | Same as Adderall; long duration masks sleep debt; Beads snorted bypass XR mechanism | ~$5–$20 per 30 mg capsule |
Street prices are regional estimates. Potency and cuts vary constantly — see our pressed pill guide.
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Profiles are reviewed against NIDA/DEA/EMCDDA sources. See something off? Submit a correction — it goes straight to our editorial queue.