famprofazone famprofazone 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. famprofazoneclinical dataroutes ofadministrationoralatc codenonelegal statuslegal status in general: ℞ (prescription only) identifiers iupac name 1-methyl-5--2-phenyl-4-(propan-2-yl)-1,2-dihydro-3h-pyrazol-3-one cas number22881-35-2pubchem cid3326chemspider3209uniihn0ncx453cchemblchembl1475693comptox dashboard (epa)dtxsid3045435 echa infocard100.041.153 chemical and physical dataformulac24h31n3omolar mass377.532 g·mol−13d model (jsmol)interactive image smiles o=c2\c(=c(/n(n2c1ccccc1)c)cn(c(c)cc3ccccc3)c)c(c)c