azapropazone azapropazone azapropazone is a nonsteroidal anti-inflammatory drug (nsaid). it is manufactured by goldshield under the tradename rheumox. azapropazoneclinical datatrade namesrheumoxahfs/drugs.cominternational drug namesatc codem01ax04 (who) legal statuslegal status uk: pom (prescription only) pharmacokinetic dataelimination half-life20 hoursidentifiers iupac name (rs)-5-(dimethylamino)-9-methyl-2-propyl-1h-pyrazolobenzotriazine-1,3(2h)-dione cas number13539-59-8 npubchem cid26098chemspider24310 yuniik2vot966zikeggd02966 ychebichebi:38010 ychemblchembl1231131 ncomptox dashboard (epa)dtxsid6045408 echa infocard100.033.543 chemical and physical dataformulac16h20n4o2molar mass300.362 g·mol−13d model (jsmol)interactive imagechiralityracemic mixture smiles o=c3n/1n(c2c(\n=c\1n(c)c)ccc(c2)c)c(=o)c3ccc inchi inchi=1s/c16h20n4o2/c1-5-6-11-14(21)19-13-9-10(2)7-8-12(13)17-16(18(3)4)20(19)15(11)22/h7-9,11h,5-6h2,1-4h3 ykey:mphphyzqrgltbo-uhfffaoysa-n y ny (what is this?) (verify) it was available in the uk as a prescription-only drug, with restrictions due to certain contra-indications and side-effects. azopropazone has now been discontinued in the british national formulary. azapropazone has a half-life of approximately 20 hours in humans and is not extensively metabolized.