CHICAGO (Reuters) - Healthy men who took Cialis or Viagra daily for six months did not develop any significant vision problems, U.S. researchers said on Monday in a company-funded study aimed at addressing concerns about the popular impotence treatments.
Pfizer Inc's Viagra or sildenafil and Eli Lilly and Co's Cialis or tadalafil treat impotence by increasing blood flow to the genitals, but some men taking the drugs have reported blurred vision, blue-tinged vision or altered light perception.
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