Sadovsky R , Miller T , Moskowitz M , Hackett G.Three-year update of sildenafil citrate (Viagra) efficacy and safety . Int J Clin Pract2001;55(2): 115-128
2.
Padma-Nathan H , Giuliano F.Oral drug therapy for erectile dysfunction . Urol Clin North Am2001;28(2): 321-334
3.
Lue TF.Erectile dysfunction . N Eng J Med2000;342: 1802-1813
4.
Lin CS , Xin ZC , Lin G , Lue TF.Phosphodiesterases as therapeutic targets . Urology2003;61(4): 685-691
5.
Sairam K , Kulinskaya E , McNicholas TA , Boustead GB , Hanbury DC.Sildenafil influences lower urinary tract symptoms . BJU Int2002;90: 836-839
6.
Brock G , McMahon CG , Chen KK , Costigan T , Shen W , Watkins V , et al . Efficacy and safety of tadalafil for the treatment of erectile dysfunction: results of integrated analyses . J Urol2002;168: 1332-1336
7.
Saenz de Tejada I , Angulo J , Cuevas P , Fernandez A , Moncada I , Allona A , et al . The phosphodiesterase inhibitory selectivity and the in vitro and in vivo potency of the new PDE5 inhibitor vardenafil . Int J Impot Res2001;13: 282-290
8.
Patterson B , Bedding A , Jewell H , Payne C , Mitchell M.The effect of intrinsic and extrinsic factors on the pharmacokinetic properties of tadalafil . Int J Impot Res2001;13(Suppl4): A120