title: On call. Your answer to a reader's question in the July issue reassured me (and my wife) that Viagra is safe for my heart. But a new worry has surfaced: is Viagra safe for my eyes?
authors.forename: Harvey B
authors.initials: HB
authors.lastname: Simon
mesh_terms: D007172:Erectile Dysfunction / Q000188:drug therapy; D006801:Humans; D008297:Male; D018917:Optic Neuropathy, Ischemic / Q000139:chemically induced*; D010726:Phosphodiesterase Inhibitors / Q000009:adverse effects*; D010879:Piperazines / Q000009:adverse effects*; D011687:Purines; D000068677:Sildenafil Citrate; D013450:Sulfones; D014665:Vasodilator Agents / Q000009:adverse effects*; D014786:Vision Disorders / Q000139:chemically induced
chemical_list: D010726:Phosphodiesterase Inhibitors; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D014665:Vasodilator Agents; D000068677:Sildenafil Citrate