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About Viagra

Sildenafil citrate, sold as Viagra, Revatio and under various other trade names, is a drug used to treat erectile dysfunction and pulmonary arterial hypertension (PAH). It was originally developed by British scientists and then brought to market by the US-based pharmaceutical company Pfizer. It acts by inhibiting cGMP-specific phosphodiesterase type 5, an enzyme that delays degradation of cGMP, which regulates blood flow in the penis. Since becoming available in 1998, sildenafil has been the prime treatment for erectile dysfunction; its primary competitors on the market are tadalafil (Cialis) and vardenafil (Levitra).

The primary indication of sildenafil is treatment of erectile dysfunction (inability to sustain a satisfactory erection to complete intercourse). Its use is now standard treatment for erectile dysfunction in all settings, including diabetes. People on antidepressants may experience sexual dysfunction, either as a result of their illness or as a result of their treatment. A 2003 study showed that sildenafil improved sexual function in men in this situation. Following up to earlier reports from 1999, the same researchers found that sildenafil was able to improve sexual function in female patients on antidepressants as well.

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FAQ
What is the difference between Viagra, Cialis, Levitra, Soft and Regular?

Please, check the table below:

Drug NameTime before
it starts to act
How to takeAlcoholEffect lasts
Viagra1 hourtake with a glass of waterno3-4 hours
Viagra Soft15 - 20 minutesput under the tongue till it dissolvesyes6 hours
Cialis30 minutestake with a glass of waterno36 hours
Cialis Soft15 - 20 minutesput under the tongue till it dissolvesyes24 - 36 hours
Levitra10 minutes - 1 hourtake with a glass of waterno12 hours