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The commonest Unwanted side effects of VIAGRA: headache; flushing; upset tummy; abnormal eyesight, such as adjustments in colour eyesight (such as using a blue shade tinge) and blurred vision; stuffy or runny nose; back again ache; muscle suffering; nausea; dizziness; rash.an erection that will not go away (priapism). For those who have an erection