The commonest side effects of VIAGRA: headache; flushing; upset abdomen; abnormal eyesight, for example improvements in colour eyesight (for instance aquiring a blue colour tinge) and blurred eyesight; stuffy or runny nose; back again agony; muscle mass suffering; nausea; dizziness; rash.Yo?un bir kanser hastas?s?n?z, tedavi oluyorsun ve kanser ila