UNSW Australia researchers warn that sildenafil, the active ingredient in the erectile dysfunction drug Viagra (Regd) , could cause unusual visual responses in people who carry a common mutation for eye disease and may have long-term detrimental effects on their vision. Sildenafil can inhibit an enzyme which is important for transmitting light signals from the retina to the brain, and it is already known from clinical trials of Viagra (Regd) that its use in high doses can cause ...
via Medindia Health News
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