seizure (convulsions); or.
abnormal vision (blurred vision, changes in color vision)
This question sounds like the opening for yet another joke about one of the most well-known and joked-about drugs in the history of pharmaceuticals. Viagra, which is the trade name for the drug sildenafil, is prescribed for men who can't get or maintain an erection when sexually stimulated.
Before looking at what would happen if a woman took Viagra — which is not a joke, by the way — let's explore for a moment how Viagra works on men. So how exactly is Viagra triggered when a man is sexually stimulated? Here's how it goes: When a man is aroused, his body releases nitric oxide into the erectile tissue of his penis, which stimulates an enzyme that produces cyclic guanosine monophosphate (cGMP). This causes the smooth muscle cells to relax and the arteries in the penis to dilate, which increases the blood flow to the penis and causes the erectile tissue to also fill with blood. The combination results in an erection. Viagra works by maintaining the level of cGMP in the smooth muscle cells, which are only present in the first place when a man is turned on [source: BPAS].
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