Research chemicalStimulantResearch chemicalPiperazine
pFPP (para-Fluorophenylpiperazine)
Also known as pFPP · para-Fluorophenylpiperazine · 4-FPP
pFPP (para-fluorophenylpiperazine) is a serotonergic phenylpiperazine sold as a minor party pill ingredient. It is mild and predominantly serotonergic, with limited recreational value and sparse human data.
01 Overview
pFPP (1-(4-fluorophenyl)piperazine) is a fluorinated phenylpiperazine that appeared in party pill formulations. Like other phenylpiperazines it acts mainly on serotonin systems.
Users describe it as mild and relaxing rather than stimulating, with modest recreational appeal. Dedicated human data is scarce, and its profile is largely inferred from the phenylpiperazine class.
02 Mechanism
Acts as a serotonin releaser and agonist at 5-HT receptors, producing mild serotonergic effects.
03 Dosing
| Tier | Dose | Route | Notes |
|---|---|---|---|
| Common | 50–150 mg | Oral | Anecdotal; reported as mild and relaxing. |
04 Effects
| Effect | Magnitude | Evidence | |
|---|---|---|---|
| Mild relaxationGentle serotonergic effect described as calming rather than stimulating. | Anecdotal |
05 Side effects
| Effect | Severity | Frequency | Evidence | Countermeasures |
|---|---|---|---|---|
| Nausea and headacheNausea and headache reported, typical of serotonergic piperazines. | Mild | Common | Anecdotal | |
| Serotonergic interaction riskSerotonin-releasing action gives a theoretical serotonin toxicity risk when combined with other serotonergic drugs. | Severe | Rare | Unconfirmed |
06 Legal status
UK
Class C (Misuse of Drugs Act)
Captured as a piperazine derivative. · as of Jan 2026
United States
Analogue exposure possible
Not explicitly scheduled federally; analogue provisions may apply. · as of Jan 2026
07 References
Fluorophenylpiperazine pharmacologyPubMed
Piperazine derivatives drug profileEUDA (European Union Drugs Agency)
08 Discussion0 comments
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This page is reference information, not medical advice. Doses and protocols are documented as they appear in the clinical literature and in practice — describing them is not a recommendation to use them. Countermeasures listed here are not a substitute for a physician. Legal status varies by jurisdiction and changes.