Sublingual use of sildenafil for erectile dysfunction results in an average onset of action of 15 minutes and lasting for an average of 40 minutes. Though there are no severe side effects stated by the product, users sensitive to its ingredients may experience some inconvenience.

For some females with HDSS, Addyi can improve sexual desire and increase the number of sexually satisfying events.However, some people find that if Viagra works to treat their erectile problem, it also increases their sexual confidence. The first document guaranteed sole production and sale of the substance until 2012, while the second gave Pfizer the exclusive use to treating erectile dysfunction with sildenafil until 2014. People with hereditary degeneration of the back of the eyeball (retina), such as retinitis pigmentosa.

Be sure to tell your doctor about any medical conditions you have and any medications you take before starting Viagra. The major product of metabolisation by these enzymes is N-desmethylated sildenafil, which is metabolised further. After taking a dose of Viagra, the drug’s level in your body will gradually decrease over a period of a few hours.

This includes products that contain these ingredients either alone or in combination with other ingredients. A UK patent held by Pfizer on the use of PDE5 inhibitors (see below) as treatment of impotence was invalidated in 2000 because of obviousness; this decision was upheld on appeal in 2002. In fact, sometimes these drugs may cause symptoms of erectile dysfunction (ED), which Viagra is used to treat. If you’ve already had this eye condition in the past, you could have a higher risk of developing it with Viagra.