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Derungs A, Schietzel S, Meyer MR, Maurer HH, Krähenbühl S, Liechti ME. 
“Sympathomimetic toxicity in a case of analytically confirmed recreational use of naphyrone (naphthylpyrovalerone)”. 
Clinical Toxicology. 2011.
Context. Naphyrone (naphthylpyrovalerone) is a cathinone derivative and recreational drug related to mephedrone. Case. We report a 31-year-old man who ingested a dose of naphyrone (100 mg), which produced acute sympathomimetic toxicity with restlessness, insomnia, anxiety, and hallucinations lasting for 2 days. Naphyrone was detected in the patient's plasma by gas chromatography with mass spectrometry at concentrations of 0.03 and 0.02 mg/L, 40 and 60 h after drug intake, respectively. Discussion. Based on the present case report and user web-reports, as well as on the chemical structure and pharmacological characteristics, naphyrone produces stimulant-like psychotropic effects and sympathomimetic toxicity.

Key Words: CNS, amphetamine, stimulant, drug abuse, pharmacokinetics
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