The patient information that came with my Viagra prescription warned of sudden vision or hearing loss.  Should I be worried?
D054062:Deaf-Blind Disorders / Q000139:chemically induced*; D003639:Hearing Loss, Sudden / Q000139:chemically induced*; D006801:Humans; D008297:Male; D010879:Piperazines / Q000009:adverse effects*; D011687:Purines / Q000009:adverse effects; D000068677:Sildenafil Citrate; D013450:Sulfones / Q000009:adverse effects*; D014665:Vasodilator Agents / Q000009:adverse effects*
D010879:Piperazines; D011687:Purines; D013450:Sulfones; D014665:Vasodilator Agents; D000068677:Sildenafil Citrate