13,14-dihydro-15-keto Prostaglandin E1 (PGE1) is a metabolite of PGE1 with much reduced biological activity. Steady state plasma concentrations are about 10 pg/ml. 13,14-dihydro-15-keto PGE1 is a weak inhibitor of ADP-induced platelet aggregation in human PRP and washed platelets with IC50 values of 54 and 200 μM, respectively, compared to PGE1 which has an IC50 of 40 nM.
