title: Viagra and loss of vision.
mesh_terms: D007172:Erectile Dysfunction / Q000188:drug therapy; D006801:Humans; D008297:Male; D018917:Optic Neuropathy, Ischemic / Q000139:chemically induced / Q000453:epidemiology; D010726:Phosphodiesterase Inhibitors / Q000009:adverse effects / Q000627:therapeutic use; D010879:Piperazines / Q000009:adverse effects* / Q000627:therapeutic use; D011687:Purines; D000068677:Sildenafil Citrate; D013450:Sulfones; D014786:Vision Disorders / Q000139:chemically induced*
chemical_list: D010726:Phosphodiesterase Inhibitors; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate