Viagra May Be Linked To Vision Side Effects


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Viagra May Be Linked To Vision Side Effects

Ophthalmologists are continuing to monitor vision side effects associated with Viagra (sildenafil citrate, Pfizer Inc.), a popular drug for treating erectile dysfunction in men.

Viagra and Vision Side Effect of Optic Neuropathy

Viagra may cause non-arteritic anterior ischemic optic neuropathy (NAION) in patients already at risk for heart disease linked to artery blockages, according to the March 2005 edition of Journal of Neuro-Ophthalmology.

In NAION, blood flow is interrupted to the optic nerve responsible for transmitting images from the eye to the brain.

Archives of Ophthalmology also reports in its March 2005 edition that Cialis (tadalafil), prescribed for treatment of erectile dysfunction in men, was associated with development of anterior ischemic optic neuropathy (AION) in one reported case.

Viagra Vision Side Effect of Seeing Blue

The most common vision side effect related to Viagra involves seeing a bluish tinge that may be accompanied by light sensitivity.

Side effects can last minutes or hours.

During clinical trials in the late 1990's, about 3% of patients reported these types of side effects at dosages of 25 mg, 50 mg or 100 mg. But some ophthalmologists have noted that ocular side effects appear most common in people who exceed recommended dosages.

"Seeing blue" occurs when an enzyme found in the penis is blocked to relax the smooth muscle and dilate blood vessels for an erection. A form of this same enzyme is found in the eye's light-sensitive inner back layer, the retina. This is why the unusual "seeing blue" visual effect occurs in a small percentage of cases.

Men With Retinal Diseases Should Avoid Viagra

Viagra generally is not recommended for men who already have retinal diseases. Also, long-term effects of the drug still are unknown. In extremely rare cases, the drug has caused other complications such as bleeding in the retinal area.