title: Ask the doctor. I tried Viagra for impotence and it didn't work. Is there anything else that I can try?
authors.forename: T H
authors.initials: TH
authors.lastname: Lee
mesh_terms: D007172:Erectile Dysfunction / Q000209:etiology / Q000628:therapy*; D006304:Health Status; D006801:Humans; D008297:Male; D010726:Phosphodiesterase Inhibitors / Q000627:therapeutic use; D010879:Piperazines / Q000627:therapeutic use; D011687:Purines; D000068677:Sildenafil Citrate; D013450:Sulfones
chemical_list: D010726:Phosphodiesterase Inhibitors; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate