EXP-3174

EXP-3174 is a physiologically active metabolite of losartan, produced by cytochrome P450 isoforms in the liver. EXP-3174 is a potent angiotensin II receptor, type 1 (AT1) antagonist (Kis = 0.57 and 0.67 nM for rat and human forms, respectively), producing a depressor response and vasodilatation. When administered intravenously, losartan carboxylic acid is more potent and has a longer duration of action than losartan. However, the metabolite has very low oral bioavailability.