"Healthy men who took Viagra, Cialis see fine: study
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.
The drugs work by blocking the action of the enzyme phodiesterase type 5 or PDE5 on the blood vessels in the penis. But PDE5 inhibitors may also act on blood vessels in the retina, which could explain some of the reports of vision problems.
To test this, a team led by Dr. William Cordell of Lilly Research Laboratories in Indianapolis and colleagues conducted a randomized study to look for changes in the retina among men taking Viagra or Cialis."
... bla, bla, bla....
Conclusão:
"Among the 194 men who completed the study, the researchers found no significant differences between treatment and placebo groups on visual function tests"
Porque é que isto importa?
Viagra and Cialis each had global sales of more than $1 billion in 2008.
Full news na reuters
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