American journal of ophthalmology
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Randomized Controlled Trial Comparative Study Clinical Trial
Effect of sildenafil citrate (Viagra) on retinal blood vessel diameter.
The present investigation was conducted to evaluate the effect of sildenafil citrate (Viagra, Pfizer Inc., New York, NY) on retinal blood vessel diameter. ⋯ These data suggest that at the maximum therapeutic dose used clinically (100 mg), sildenafil does not have a significant effect on retinal vascular caliber.