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Viagra (sildenafil) is a medication that is often used to treat erectile dysfunction (ED), a problem that is believed to affect over 150 million individuals all over the globe. Generic sildenafil is available in the shape of white pills, in contrast to the blue pills that come with the brand-name version of the prescription. Although the use of generic sildenafil to treat pulmonary arterial hypertension is possible, the FDA has only given its blessing to the use of sildenafil that is equal to that found in Revatio for the treatment of this specific ailment.