The most common Uncomfortable side effects of VIAGRA: headache; flushing; upset stomach; irregular eyesight, for example changes in colour eyesight (for example having a blue shade tinge) and blurred eyesight; stuffy or runny nose; back again agony; muscle soreness; nausea; dizziness; rash.Sa?l?k Bakan? Fahrettin Koca, sahte ilaç iddialar?yla ilgi