3-Fluorophenmetrazine
3-Fluorophenmetrazine
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3-Fluorophenmetrazine

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3-Fluorophenmetrazine

3-Fluorophenmetrazine (also known as 3-FPM, 3-FPH and PAL-593) is a phenylmorpholine-based stimulant and fluorinated analogue of phenmetrazine that has been sold online as a designer drug.

3-Fluorophenmetrazine is a fluorinated analogue of phenmetrazine, a stimulant of the morpholine class.

3-Fluorophenmetrazine is a regioisomer of both 2-fluorophenmetrazine and 4-fluorophenmetrazine.

3-FPM acts as a norepinephrine–dopamine releasing agent with EC50 values of 30 nM and 43 nM, respectively. It shows only negligible efficacy as a releaser of serotonin, with an EC50 value of 2558 nM.

3-FPM also inhibits uptake mediated by dopamine transporters and norepinephrine transporters in HEK293 cells with potencies comparable to cocaine (IC50 values <2.5 μM), but with less potent effects at serotonin transporters (IC50 values >80 μM).

At sufficient doses, 3-FPM is capable of reversing monoamine transporters, particularly transporters of the catecholamines dopamine and norepinephrine, and, to a much lesser degree, serotonin transporters, thereby releasing these neurotransmitters from the cytosol into the extracellular space, where they are active.

Evaluation of its metabolic pathway revealed N-oxidation, aryl hydroxylation and subsequent O-methylation, alkyl hydroxylation, oxidation, and degradation of the ethyl-bridge yielding the O/N-bis-dealkylated metabolite, combinations thereof and further glucuronidation or sulfations.

In the United States, 3-fluorophenmetrazine is not explicitly illegal at the federal level, but may be considered under the federal analogue act if intended for consumption as a structural analog of the Schedule II drug Phenmetrazine, but only if intended for human consumption.

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