Short Answer: Viagra works by “boosting” the way nitric oxide relaxes the smooth muscles in the penis in response to sexual stimulation. The relaxation of the muscles allows more blood to flow to the penis.
Long Answer: Erectile dysfunction is described as when the penis will not become erect or firm, even when receiving signals from the brain and the rest of the body that sexual stimulation is occurring. Losing the erection during the sex act is also a form of erectile dysfunction.
Most men, whether or not they want to admit it, will experience at least one episode of erectile dysfunction in their lives. Many things can cause a man to suffer erectile dysfunction. Some can be physical; others can be mental or emotional.
Physical causes include taking certain prescription drugs, such as medication for high blood pressure, having diabetes, or as a result of prostate surgery. Emotional causes include job stress and depression.
The fear that erectile dysfunction can happen or will happen again if a man has experienced it before can cause a mental reaction. A man becomes so worried about his performance that any possibility of an erection occurring is negated.
Viagra works by acting as a phosphodiesterase type 5 or PDE-5 inhibitor. Basically, that means that Viagra suppresses or blocks or changes how the body reacts to phosphodiesterase type 5 (PDE-5). When that happens, and when there is sexual stimulation, the chemical nitric oxide causes the smooth muscles in the penis to relax. This in turn allows more blood to reach the vessels in the penis.
Sexual stimulation MUST occur for Viagra to work. Although cartoons, sitcoms, and other places suggest that a man will be walking around with a raging erection within 30 minutes of taking Viagra, with no sexual stimulation whatsoever, this is simply not true.
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