spec sheet10 rows
MCPP (meta-chlorophenylpiperazine) is a piperazine compound best known as a metabolite of the antidepressant trazodone and as a common adulterant sometimes sold in place of MDMA. It works mainly on the serotonin system, acting as a releaser and receptor agonist, and is used heavily in research as a serotonergic probe. Recreationally it is generally disliked, often causing anxiety, nausea and headache rather than a pleasant high.
- Used as a serotonergic research probe
- Mild stimulation in some users
- Well studied pharmacologically
- Anxiety and unease
- Nausea and headache or migraine
- Serotonin toxicity risk in combination
Mechanism
MCPP acts on the () system as a releaser and as a direct at several serotonin receptor subtypes, notably 5-HT2C and 5-HT1 receptors. This broad serotonergic activation is why it is used in laboratories to probe serotonin function; it can trigger anxiety, migraine and hormonal responses in controlled studies. It does not produce the balanced monoamine release of MDMA, which is a large part of why people who take it expecting MDMA find it unpleasant.
receptor fingerprint
5-HT2C receptorAgonist
transporter (SERT)Releaser
5-HT1 receptorsAgonist
Dosingtypical ranges, not medical advice
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Safetyrisks and cautions, not medical advice
Because MCPP is strongly serotonergic, combining it with MAOIs or other serotonin-raising drugs risks serotonin toxicity (a dangerous excess of serotonin causing agitation, fever, muscle rigidity and, in severe cases, death). On its own it commonly causes anxiety, nausea, headache and migraine rather than euphoria, and it frequently turns up as an unlabeled adulterant, so people may take it unknowingly. Not medical advice.
Subjective profileweighing the evidence above
Useful in a lab, unpleasant everywhere else. It reliably produces anxiety, nausea and headache rather than anything people enjoy, and it matters mainly because it turns up unlabeled in tablets sold as MDMA. Serotonin toxicity risk makes any MAOI or serotonergic combination dangerous.
Resources
This entry is here for reference.
Research
- 1.Chemistry, pharmacology, toxicology, and hepatic metabolism of designer drugs of the amphetamine (ecstasy), piperazine, and pyrrolidinophenone types: a synopsis.
- 2.Comparative anxiogenic, neuroendocrine, and other physiologic effects of m-chlorophenylpiperazine given intravenously or orally to healthy volunteers.
2 listed here; entry last updated July 2026
Reviews
My notesprivate to this device
FAQ
Is MCPP the same as MDMA?
No. It is a different piperazine compound that often gets sold as MDMA, but its serotonin-heavy profile tends to cause anxiety, nausea and headache instead of MDMA's warmth.
Where does MCPP come from?
It occurs as a metabolite of several antidepressants like trazodone, and it is manufactured as a research chemical and street adulterant.
Why is it risky with other serotonergic drugs?
It raises and mimics serotonin, so mixing it with MAOIs or SSRIs can push serotonin to dangerous levels, a condition called serotonin toxicity.
Adverse effects
- Anxiety and unease
- Nausea and headache or migraine
- Serotonin toxicity risk in combination
Notes and cautions
- Often mis-sold as MDMA