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Brand names: Viagra, Revatio

Generic names: Sildenafil citrate

Viagra (sildenafil citrate) can be prescribed by your health care provider if you experience repeated inability to achieve an erection hard enough to complete sexual intercourse. Although some side effects you may experience when you take Viagra for the first time (heartburn, muscle aches, headache, insomnia diarrhea, light sensitivity, flushing) are most likely to go away after a couple of hours, tell your health care provider if they persist or appear every time you use the medicine. Let your health care provider know if you have been diagnosed with any of the following health conditions as a dose adjustment may be required: congestive heart failure, high blood pressure, low blood pressure, liver or kidney disease, stomach ulcer, retinitis pigmentosa, blood cell disorder (leukemia), bleeding disorder (hemophilia) or coronary artery disease.