Viagra: Treating ED: Viagra (sildenafil) mimics a natural hormone made in the veins at the base of your penis. This hormone causes the veins to constrict leading to a firmer erection when sexually aroused. It works very well. But many men report sinus pressure, headache, and some visual symptoms. In rare instances for men on medications containing nitrates men can go into congestive heart failure. Please get advice from your doc.
Answered 6/22/2013
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