title: Looking beyond Viagra. The 30 million American men with impotence problems may soon have two oral treatments to choose from. How do they compare?
authors.forename: G
authors.initials: G
authors.lastname: Cowley
mesh_terms: D001058:Apomorphine / Q000009:adverse effects / Q000627:therapeutic use; D007172:Erectile Dysfunction / Q000188:drug therapy*; D006801:Humans; D008297:Male; D010879:Piperazines / Q000009:adverse effects / Q000627:therapeutic use*; D011687:Purines; D000068677:Sildenafil Citrate; D013450:Sulfones
chemical_list: D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate; D001058:Apomorphine