Description  Claims  Cited references 

US5594032A   [0007] 
US6133281A   [0007] 
US6007824A   [0007] 
US20050085486A   [0007]  [0008] 
JP2002193826A   [0013] 
US20020051826A   [0016] 
US20090274722A   [0018] 
WO2009121687A   [0018] 

Sildenafil Preserves Intracorporeal Smooth Muscle After Radical Retropubic Prostatectomy   [0007]  [0040] 
Phosphodiesterase type 5 (PDE5) inhibitors for the treatment of erectile dysfunction   [0010] 
Elucidation of Danzhixiaoyao Wan and its Constituent Herbs on Antioxidant Activity and Inhibition of Nitric Oxide Production   [0013]  [0044] 
British Journal of Clinical Pharmacology   [0045] 
Int J of Imp Res.   [0058] 
J Urol   [0058] 
Pharmacist's Letter/Prescriber's Letter of Natural Medicines Comprehensive Database   [0059]