Viagra and ocular effects

Categories: Viagra

Viagra is a successful first-line therapy for ED treatment for most men. Still some serious side effects possibility can prevent certain groups of men from taking it. One of the possible serious side effects of Viagra is ocular effect. These are increased light sensitivity, blurring, and a bluish tint or haze to vision.
Some men are more likely to get ocular side effects due to their eye problems or diseases such as macular degeneration, diabetic retinopathy, retinitis pigmentosa or other retinal disease. These patients are usually recommended to avoid Viagra use.
Viagra may cause ocular side effects in men who take larger doses of the drug. Vision side effects are usually dose-related, so the larger the dosage, the more chance of the risk. According to one of the clinical Viagra study about 50 percent of men taking 200 mg of Viagra experience vision changes. Therefore men should not exceed the max recommended dose of 100 mg per day. Those who are recommended to use lower doses of Viagra should never take larger doses of this drug.
Viagra produces vision changes because it inhibits phosphodiesterase enzymes including an enzyme PDE6 which is present in retinal photoreceptors. Though Viagra has a mild inhibiting effect on this enzyme (it is selective for PDE5) it can cause increased light sensitivity and so called blue vision.
Retinal specialists warn men with retinal problems not to take Viagra. Patients with eye conditions should consult their doctors before using this drug.

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