Sildenafil citrate (Viagra).
Sildenafil citrate (Viagra) has been the first acknowledged oral medicine that can contribute to treatment of erectile dysfunction. Viagra  was approved by the Food and Drug Administration (FDA) in March 1998. Five years later, Levitra and Cialis were introduced for the same purpose. At the moment, sildenafil citrate (Viagra) tends to become the best seller agent in the history of pharmaceutical industry, because it has been accepted with enthusiasm on behalf of both medical society and public. This is due to its fast action, minor side-effects, high-percentage efficacy and the fact that helps in management of impotence which has been recognized as the most common male sexual disorder.
Viagra which must be taken on empty stomach, can easily be administered and is readily absorbed within the gastrointestinal track. The medicine is processed rapidly and its medical effects take the latest an hour to appear, providing sexual stimulation and arousal take place, since they are necessary for the erection to occur. Viagra does not cause priapism which is an automatic, persistent and quite often painful erection. The duration of active period ranges between four and eight hours. Although the effectiveness of Viagra may vary, depending on the person's medical history and the cause of erectile dysfunction, studies have shown that sildenafil citrate is beneficial in 78% of male users. Viagra does not seem to produce any effect in women.
Sildenafil citrate has been classified as a selective enzyme inhibitor and it is a vasodilatory agent. It contributes to relaxation of the penile smooth muscle that controls the relevant blood vessels. Viagra causes or boosts erection by enhancing the effects of the neurotransmitter nitric oxide and allowing more blood to flow into the penis. Viagra also sustains this erection by preventing the premature return of blood to the main body.
It has to be mentioned that due to high demand there are quite a lot of fraudulent preparations in the market that may be proved either ineffective or potentially dangerous. The buyer should be cautious and purchase Viagra only from licensed pharmacies. If you want to find generic Viagra of 25, 50 and 100mg, click the
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Recommended dose for Viagra.
The recommended dose for Viagra is 50mg, and the physician may adjust this dose to 100mg or 25mg, depending on the individual. For instance, 25mg may be enough for a man who is at his fifties and suffers from a mild erectile dysfunction. A dose of 50mg may be more suitable for men with moderate impotence, whereas 100mg are recommended for severe cases. Viagra should not be used more than once a day.
Precautions and side-effects related to Viagra.
Men, who take nitrate-based drugs such as nitro-glycerin for heart problems should not use Viagra without their cardiologist's advice. Otherwise such a combination can cause a dramatic decrease of blood pressure and perhaps dangerous postural hypotension.
Side-effects of Viagra include occasional, moderate headache, nasal congestion, stomach discomfort and perhaps minor and temporary sight changes. No cardiac adverse pharmaceutical results, caused by sildenafil citrate have been reported.
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