Famprofazone ( Gewodin, Gewolen) is a nonsteroidal anti-inflammatory agent (NSAID) of the pyrazolone series which is available over-the-counter in some countries such as Taiwan.   It has  analgesic, anti-inflammatory, and antipyretic effects.  Famprofazone has been known to produce  methamphetamine as an active metabolite, with 15-20% of an oral dose being converted to it.  As a result, famprofazone has occasionally been implicated in causing positives on  drug tests for amphetamines.
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References [ edit ]
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Swiss Pharmaceutical Society (2000). . Boca Raton: Medpharm Scientific Publishers. p. 1932. Index Nominum 2000: International Drug Directory (Book with CD-ROM) ISBN . 3-88763-075-0
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Hall, Judith A.; Morton, Ian (1999). . Kluwer Academic. p. 342. Concise dictionary of pharmacological agents: properties and synonyms ISBN . 0-7514-0499-3
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Chan KH, Hsu MC, Tseng CY, Chu WL (2010). "Famprofazone use can be misinterpreted as methamphetamine abuse". Journal of Analytical Toxicology. 34 (6): 347–53. doi: . 10.1093/jat/34.6.347 PMID 20663288.
Oh ES, Hong SK, Kang GI (March 1992). "Plasma and urinary concentrations of methamphetamine after oral administration of famprofazone to man". Xenobiotica. 22 (3): 377–84. doi: 10.3109/00498259209046649. PMID 1496827.
Shin HS, Park BB, Choi SN, Oh JJ, Hong CP, Ryu H (1998). "Identification of new urinary metabolites of famprofazone in humans". Journal of Analytical Toxicology. 22 (1): 55–60. doi: . 10.1093/jat/22.1.55 PMID 9491970.