The most typical Unwanted side effects of VIAGRA: headache; flushing; upset belly; irregular vision, such as improvements in color eyesight (for example possessing a blue colour tinge) and blurred eyesight; stuffy or runny nose; back suffering; muscle agony; nausea; dizziness; rash.are allergic to sildenafil, as contained in VIAGRA and Revatio®, o… Read More