phenindione phenindione phenindione is an anticoagulant which functions as a vitamin k antagonist. phenindioneclinical dataahfs/drugs.cominternational drug namespregnancycategory au: d passes into breast milk routes ofadministrationoralatc codeb01aa02 (who) pharmacokinetic dataprotein binding88%elimination half-life5 to 10 hoursidentifiers iupac name 2-phenyl-1h-indene-1,3(2h)-dione cas number83-12-5 ypubchem cid4760iuphar/bps6838drugbankdb00498 ychemspider4596 yunii5m7y6274zekeggd08354 ychebichebi:8066 ychemblchembl711 ycomptox dashboard (epa)dtxsid5023453 echa infocard100.001.323 chemical and physical dataformulac15h10o2molar mass222.243 g·mol−13d model (jsmol)interactive image smiles o=c2c1ccccc1c(=o)c2c3ccccc3 inchi inchi=1s/c15h10o2/c16-14-11-8-4-5-9-12(11)15(17)13(14)10-6-2-1-3-7-10/h1-9,13h ykey:nfbaxhoproojaw-uhfffaoysa-n y (verify) phenindione was introduced in the early 1950s. it acts similar to warfarin, but it has been associated with hypersensitivity reactions, so it is rarely used and warfarin is preferred.