Ticlopidine (PCR5332) is an antithrombotic precursor that acts as a noncompetitive metabolic inhibitor with a value of 81.7 μM.Ticlopidine is an inhibitor of human hepatic cytochromes.Ticlopidine inhibits CYP2C9 and, with values of 26.0 and 32.3 μM, respectively.