title: Transient renal effects of sildenafil in male kidney transplant recipients.
abstract: BACKGROUND
  Sildenafil (Viagra) improves erection by sustaining Guanosine 3', 5'-cyclic monophosphate (cGMP)-mediated smooth muscle relaxation in the corpus cavernosum. It also induces systemic vasodilation, resulting in a minor decrease in blood pressure. We evaluated the effect of one dose of sildenafil on graft function and hemodynamics in impotent male transplant recipients.
  
  
  METHODS
  Two sets of combined lithium, inulin, and p-amino hippurate clearance studies were conducted, with and without sildenafil (100 mg orally) in 11 male kidney transplant recipients (KTRs).
  
  
  RESULTS
  Sildenafil increased glomerular filtration rate by 14+/-4 from the baseline value of 55+/-7 ml x min(-1) x 1.73 m2(-1) (P<0.01), whereas calculated renal vascular resistances decreased by 40+/-18 from the baseline value of 247+/-29 mmHg/L x min(-1) x 1.73 m2-1 (P<0.05).
  
  
  CONCLUSIONS
  The oral administration of sildenafil in KTRs did not impair the function of the graft. In terms of renal physiology, the observed modifications did not warrant any specific precautions when offering sildenafil to KTRs suffering from erectile dysfunction.
authors.affiliation: Department of Urology and Renal Transplantation, INSERM Unit 388, Hôpital Rangueil, Toulouse, France. malavaud.b@chu-toulouse.fr
authors.forename: B
authors.initials: B
authors.lastname: Malavaud
authors.forename: L
authors.initials: L
authors.lastname: Rostaing
authors.forename: T
authors.initials: T
authors.lastname: Tran-Van
authors.forename: I
authors.initials: I
authors.lastname: Tack
authors.forename: J L
authors.initials: JL
authors.lastname: Ader
mesh_terms: D007172:Erectile Dysfunction / Q000188:drug therapy*; D005919:Glomerular Filtration Rate; D006801:Humans; D007668:Kidney / Q000187:drug effects*; D016030:Kidney Transplantation; D008297:Male; D008875:Middle Aged; D010726:Phosphodiesterase Inhibitors / Q000627:therapeutic use*; D010879:Piperazines / Q000627:therapeutic use*; D011184:Postoperative Period; D011687:Purines; D012079:Renal Circulation / Q000187:drug effects; D000068677:Sildenafil Citrate; D013450:Sulfones; D013997:Time Factors; D014655:Vascular Resistance / Q000187:drug effects
chemical_list: D010726:Phosphodiesterase Inhibitors; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate