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NCI Drug Dictionary

  

sildenafil citrate 
The citrate salt of a pyrazolopyrimidinone derivative structurally related to zaprinast. Sildenafil selectively inhibits cyclic guanosine monophosphate (cGMP)-specific type 5 phosphodiesterase, resulting in vasodilation in the corpus cavernosum of the penis and penile erection. Check for active clinical trials or closed clinical trials using this agent. (NCI Thesaurus)
US brand name:Viagra