Sildenafil for pulmonary hypertension can also be known by the brand names Revatio and Grandipam. Some alternative products that claim to work for erectile dysfunction can be dangerous. This medicine comes with a patient information leaflet. Generic versions of sildenafil, vardenafil and tadalafil are available. Talk to your doctor about eating grapefruit and drinking grapefruit juice while taking this medicine. Other uses for this medicine This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.Sildenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). In combination with sexual stimulation, sildenafil works by increasing . Sildenafil under the name Viagra is used to treat erectile dysfunction (impotence) in men. Another brand of sildenafil is Revatio, which is used to treat pulmonary arterial . Viagra contains the drug sildenafil. It belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. (A class of drugs is a group of medications that act in a similar .