Increased Glomerular Filtration Rate in Kidney-Transplant Recipients Who Take Sildenafil

Abstract
Sildenafil is a potent inhibitor of guanosine 3',5'-cyclic monophosphate (cGMP)–specific phosphodiesterase.1,2 It is being used increasingly by male kidney-transplant recipients for erectile dysfunction,3,4 but its effects on the grafted kidney have not, to our knowledge, been examined.