Impotence Drugs Don't Harm Vision. But there are concerns that PDE5 inhibitors may also act on similar compounds in the retina, the part of the eye that receives and transmits images to the brain, according to background information in the study. Study -- The erectile dysfunction drugs Cialis (tadalafil) and Viagra (sildenafil) didn't appear to damage vision in men who took the medications daily for six months, according to a drug company study.

Of sildenafil, or a placebo daily for six months. Men taking PDE5 inhibitors have reported mild and temporary blurred vision, altered light perception, and blue-tinged vision. By the end of the study, the researchers found no significant differences in vision between the men who took the. This Eli Charline study included 244 men, ages 30 to 65, who were randomly selected to take either 5 milligrams of tadalafil, 50 mg. These drugs, called selective phodiesterase type 5 (PDE5) inhibitors, treat erectile dysfunction by interfering with the action of the compound PDE5 in the blood vessels of the penis.

The men underwent thorough eye tests before, during and after treatment.