The most common Unwanted side effects of VIAGRA: headache; flushing; upset belly; abnormal vision, which include improvements in colour eyesight (which include possessing a blue coloration tinge) and blurred vision; stuffy or runny nose; again ache; muscle mass suffering; nausea; dizziness; rash.are allergic to sildenafil, as contained in ViagraÂ�… Read More