Sildenafil citrate, sold as Viagra, Revatio, Kamagra, Silagra, Suhagra, Caverta... and under various other trade names, contains 25mg, 50mg, 100mg, 150mg sildenafil citrate, is a drug used to treat erectile dysfunction in men.
Sildenafil was developed and is being marketed by the pharmaceutical giant Pfizer. Sildenafil acts by inhibiting cGMP-specific phosphodiesterase type 5, the enzyme that regulates blood flow in the penis.
The dose of sildenafil for erectile dysfunction is 25 mg to 150 mg taken not more than once per day between 30 minutes and 4 hours prior to sexual intercourse.

Brand VIAGRA

Sildenafil's popularity with young adults has increased over the years. Sildenafil's trade name "Viagra" is widely recognized in popular culture, and the drug's association with treating erectile dysfunction has led to its recreational use.

The reasons behind such use include the belief that the drug:
  • increases libido,
  • improves sexual performance, or
  • permanently increases penis size.

  • Studies on the effects of viagra when used recreationally are limited, but suggest that it has little effect when used by those not suffering from erectile dysfunction. In one study, a 25 mg dose was shown to cause no significant change in erectile quality, but did reduce the post-ejaculatory refractory time.
    This study also noted a significant placebo effect in the control group.
    In 2007, a group of Universidad Nacional de Quilmes, Argentina won an Ig Nobel Prize for their discovery that Viagra aids jet lag recovery in hamsters.

    Brand Viagra

    The primary indication of Brand Viagra is to treat erectile dysfunction (inability to sustain a satisfactory erection to complete intercourse). Viagra use is now standard treatment for erectile dysfunction in all settings, including diabetes.

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