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Viagra (sildenafil citrate) is often used by people unable to achieve and maintain an erection for long enough to have sex. This medicine was developed by the Pfizer company and became available in 1998. The blue pill of Viagra is one of the most recognizable brands in the world. The active ingredient of this medicine was initially studied for use in patients diagnosed with high blood pressure and angina pectoris. Some of the problems you may experience when taking this medicine include blurred vision, increased light sensitivity, sudden vision loss and trouble telling the difference between green and blue. If you are older than 65 the effects of Viagra may be stronger in you if compared to younger patients, so make sure you tell you health care provider how old you are before starting the treatment. A lower dose may be prescribed to make sure this medicine is safe for you.

Brand names: Viagra, Revatio

Generic names: Sildenafil citrate