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Viagra all you need to know about the viagra pills its use dosage and side effects information on the erectile dysfunction pill for improved sexual performance dr charlene r coats 10 out of 5 stars 6. Sildenafil citrate known by the brand name viagra is an erectile dysfunction medication originally developed by pfizer pharmaceuticals in 1989 to treat patients suffering from hypertension high blood pressure and angina pectoris a form of ischaemic cardiovascular disease. Sildenafil is the generic for two common brand drugs on the market right now revatio and viagra but these drugs are approved by the fda for two different uses revatio is used to treat pulmonary arterial hypertension while viagra treats erectile dysfunction in men how can you distinguish between the two. 1 take viagra on an empty stomach if you need the fastest onset of action it is known that heavy meals may significantly load the stomach and delay absorption of viagra so if you want to achieve the quickest effect it is recommended to take the pill on an empty stomach in fasted state 2