title: Viagra: how safe is the new 'sex pill'?
mesh_terms: D004347:Drug Interactions; D004791:Enzyme Inhibitors / Q000008:administration & dosage / Q000009:adverse effects* / Q000493:pharmacokinetics; D007172:Erectile Dysfunction / Q000188:drug therapy*; D005260:Female; D006801:Humans; D008297:Male; D009566:Nitrates; D009569:Nitric Oxide; D009948:Orgasm / Q000187:drug effects; D012449:Safety; D014786:Vision Disorders / Q000139:chemically induced
chemical_list: D004791:Enzyme Inhibitors; D009566:Nitrates; D009569:Nitric Oxide