what is a phosphodiesterase inhibitor
phosphodiesterase Related to phosphodiesterase: Phosphodiesterase inhibitors phosphodiesterase /phosÂ·phoÂ·diÂ·esÂ·terÂ·ase/ (-di-esÂ´ter-Äs) any of a group of enzymes that catalyze the hydrolytic cleavage of an ester linkage in a phosphoric acid compound containing two such ester linkages.