Inhibition of platelet function by sulbenicillin and its metabolite

The effect of sulbenicillin and its major metabolite, alpha-sulfobenzylpenicilloic acid, on platelet function was investigated. Sulbenicillin caused inhibition of platelet aggregation and release reaction in the same manner as carbenicillin. alpha-Sulfobenzylpenicilloic acid was found to cause much stronger inhibition of platelet function. The results indicate that the strong inhibitory action of alpha-sulfobenzylpenicilloic acid may also take part in impaired platelet functions following administration of sulbenicillin to humans.