are allergic to sildenafil, as contained in VIAGRA and Revatio®, or any of your components in VIAGRAThe most typical side effects of VIAGRA: headache; flushing; upset abdomen; irregular eyesight, such as alterations in coloration eyesight (like getting a blue shade tinge) and blurred eyesight; stuffy or runny nose; back again agony; muscle mass ac… Read More