Description
Zaprinast is a cyclic-GMP phosphodiesterase inhibitor with selectivity for PDE6, 5, 11 and 9 (IC50 = 0.15, 0.76, 12.0 and 29.0 µM, respectively). C-GMP acts as a mediator of signal transduction that relaxes vascular smooth muscles and increases blood flow. Therefore zaprinast exhibits vasodilating, relaxant, and diuretic effects. Zaprinast also acts as a putative GPR35 agonist