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About. Terms amp; Privacy. Subscribe to viagrra email notifications whenever new articles are published. Drugs. com provides accurate viagra vs cialis vs extenze independent information on more than 24,000 prescription drugs, over-the-counter medicines and natural products.

Muirhead G.Wulff M.Fielding A.et al. Pharmacokinetic interactions between sildenafil and saquinavirritonavir. British Journal of Clinical Pharmacology 2000; 50(2):99-107. A note from TheBody. com: The field of medicine is constantly evolving. As a result, parts of this article may be outdated.

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Scroll down for video. Viagra could cause blindness in men with inherited eye condition retinitis pigmentosa - or those with normal sight who carry the gene for the condition, Australian researchers have found. One theory is that erectile dysfunction drugs may obstruct an enzyme which is important for transmitting light signals from the retina to the brain. It is already known that sildenafil, the active ingredient in the erectile dysfunction medication, can cause temporary vision problems in some healthy people. Doctors have now warned it could also cause permanent damage to the eyes of people retinitis pigmentosa. People with normal sight that carry the gene for the condition may also be at risk, experts warn.

When will Cialis and other erectile dysfunction drugs be available in generic form. Posted 1 Aug 2014 by RonaldWilliams bull; 1 answer.]