title: Viagra: new warning with protease inhibitors.
authors.forename: J S
authors.initials: JS
authors.lastname: James
mesh_terms: D004347:Drug Interactions; D007172:Erectile Dysfunction / Q000188:drug therapy; D015658:HIV Infections / Q000188:drug therapy; D017320:HIV Protease Inhibitors / Q000009:adverse effects*; D006801:Humans; D008297:Male; D009566:Nitrates / Q000009:adverse effects; D010879:Piperazines / Q000009:adverse effects*; D011687:Purines; D000068677:Sildenafil Citrate; D013450:Sulfones
chemical_list: D017320:HIV Protease Inhibitors; D009566:Nitrates; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate