VIAGRA has sildenafil, which is identical drugs present in An additional drug called REVATIO. REVATIO is employed to treat a exceptional illness identified as pulmonary arterial hypertension (PAH). The commonest side effects of VIAGRA: headache; flushing; upset tummy; irregular eyesight, for instance adjustments in shade vision (like having a blue https://xn--2i0bm4p0sf2wh7vdmsy.net