Viagra ingredient approved for hypertension

Pfizer Inc. Monday said U.S. regulators approved the active ingredient in its impotence drug Viagra to treat pulmonary hypertension.

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The compound, called Revatio, contains the same active ingredient—sildenafil citrate—in Viagra.

Pulmonary hypertension is a rare disease where high pressure in the blood vessels moves from the heart to the lungs, Pfizer said.