tolfenamic acid tolfenamic acid tolfenamic acid (clotam, tufnil) is a member of the anthranilic acid derivatives (or fenamate) class of nsaid drugs discovered by scientists at medica pharmaceutical company in finland. like other members of the class, it is a cox inhibitor and prevents formation of prostaglandins. tolfenamic acidclinical datatrade namesclotam, clotan, tufnilahfs/drugs.cominternational drug namesroutes ofadministrationby mouthatc codem01ag02 (who) legal statuslegal status au: s4 (prescription only) identifiers iupac name 2-benzoic acid) cas number13710-19-5 npubchem cid610479chemspider530683 yunii3g943u18kmkeggd01183 ychebichebi:32243 nchemblchembl121626 ycomptox dashboard (epa)dtxsid1045409 echa infocard100.033.862 chemical and physical dataformulac14h12clno2molar mass261.71 g·mol−13d model (jsmol)interactive image smiles clc2cccc(nc1ccccc1c(=o)o)c2c inchi inchi=1s/c14h12clno2/c1-9-11(15)6-4-8-12(9)16-13-7-3-2-5-10(13)14(17)18/h2-8,16h,1h3,(h,17,18) ykey:yeznlouzaiomlt-uhfffaoysa-n y ny (what is this?) (verify) it is used in the uk as a treatment for migraine. it is generally not available in the us. it is available in some asian, latin american and european countries as a generic drug for humans and for animals.