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D007172:Erectile Dysfunction / Q000188:drug therapy; D006801:Humans; D008297:Male; D009900:Optic Nerve / Q000033:anatomy & histology / Q000187:drug effects; D018917:Optic Neuropathy, Ischemic / Q000139:chemically induced*; D010726:Phosphodiesterase Inhibitors / Q000009:adverse effects*; D010879:Piperazines / Q000009:adverse effects; D011687:Purines; D012307:Risk Factors; D000068677:Sildenafil Citrate; D013450:Sulfones
D010726:Phosphodiesterase Inhibitors; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D000068677:Sildenafil Citrate