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4-Methylpentedrone (also known as 4MPD and 4-Methyl-α-methylamino-valerophenone), is a stimulant drug of the cathinone class that has been sold online as a designer drug. It is a higher homolog of 4-methylmethcathinone (mephedrone) and 4-methylbuphedrone (4-MeMABP), and the p-methyl derivative of pentedrone.




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4-MPD Chemical Properties,Uses,Production


4-MPD (also known as 4-Methylpentedrone and 4-Methyl-α-methylamino-valerophenone), is a stimulant belonging to the Cathinone group. It is a higher homologue of 4-Methylmethcathinone (Mephedrone) and 4-Methylbuphedrone (4-MeMABP), and the p-Methyl analogue of Pentedrone.
Pentedrone is a substituted cathinone that is structurally similar to methcathinone, a psychoactive stimulant that is a controlled substance in the United States and other countries. 4-methyl Pentedrone is an analog of pentedrone that features a methyl group added at the 4 position of the phenyl ring. The physiological and toxicological properties of this compound are not known.
4-MPD is not for human consumption. This product is intended for forensic and research applications.

Fatal intoxication involving 4-methylpentedrone (4-MPD) in a context of chemsex


4-methylpentedrone (4-MPD) is an infrequent cathinone that can be used for sexual purposes (chemsex).

A fatal intoxication mainly involving 4-MPD and cocaine was reported.

Postmortem 4-MPD distribution in biological fluids is described and its metabolism explored.

Online user testimonies were reviewed to understand the profile of this new psychoactive substance (NPS).

This case report illustrates the significant toxicity of 4-MPD and the overdose risk associated with chemsex.


4-methylpentedrone (4-MPD) is a new psychoactive substance (NPS) belonging to the cathinone class. We report an original case of death mainly involving 4-MPD, along with cocaine, sildenafil, bromazepam and nevirapine. The investigation data and the autopsy findings indicated fatal intoxication in a chemsex context (drug use during sex). 4-MPD concentrations were determined in peripheral blood (1285 ng/mL), cardiac blood (1128 ng/mL), urine (>10,000 ng/mL), bile (1187 ng/mL) and vitreous humor (734 and 875 ng/mL in left and right samples, respectively) by gas chromatography (GC) coupled to tandem mass spectrometry. 4-MPD metabolites were explored by GC coupled to high resolution mass spectrometry. Due to the paucity of data concerning 4-MPD, its use and effects were gathered from online user testimonies. This case illustrates the toxicity of this infrequent pentedrone derivate and confirms the significant overdose risk associated with chemsex.


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