Stimulants
4F-MPH (4-Fluoromethylphenidate)
Street names: 4F-MPH, 4-FMPH, IPPH (isopropylphenidate)
Overdose? Act now. Call emergency services — say "unresponsive, not breathing". Give naloxone for opioid-like signs. Hotlines
⚡What it does
- Long-acting methylphenidate analog: functional stimulation 6–10 h
⚠Key risks
- Vasoconstriction, insomnia, appetite suppression like the class
- Binge redosing
- Grey-market dosing variance
- Little long-term data
✚Overdose signs
- Racing heart
- Anxiety, insomnia
- Cold extremities
📋Quick facts
Also known as4F-MPH, 4-FMPH, IPPH (isopropylphenidate)
CategoryStimulants
Schedule / classAnalogue prosecutions (US); controlled several EU
AppearanceWhite crystalline powder/pellets
Street price~$15–$35/g
Legal statusAnalogue US; controlled several EU
Last updated2026-09-18
Sources: EMCDDA, NPS-AD
Category comparison — Stimulants
| Substance | Class | Top risks | Street price |
|---|---|---|---|
| 4F-MPH (4-Fluoromethylphenidate) | Analogue prosecutions | Vasoconstriction, insomnia, appetite suppression like the class; Binge redosing | ~$15–$35/g |
| Methylphenidate (Ritalin) | Schedule II | Dependence; cardiovascular strain; Injecting crushed tablets causes lung damage | ~$2–$10 per 20 mg tablet |
| 3,4-CTMP (3,4-Dichloromethylphenidate) | Analogue prosecutions | Vasoconstriction reports — painful cold extremities; Very long duration masks sleep debt | ~$15–$35/g |
| Ethylphenidate | Analogue prosecutions | Vasoconstriction reports — painful extremities; Compulsive redosing | ~$15–$35 per gram |
Street prices are regional estimates. Potency and cuts vary constantly.
?Frequently asked questions
What does 4F-MPH (4-Fluoromethylphenidate) look like?
White crystalline powder/pellets
What are the signs of a 4F-MPH (4-Fluoromethylphenidate) overdose?
Racing heart; Anxiety, insomnia; Cold extremities Call emergency services immediately.
How addictive is it?
Vasoconstriction, insomnia, appetite suppression like the class Dependence can develop with regular use.
🔗Sources & further reading
Facts on this page are compiled from these primary sources. External links open in a new tab.