The most common Negative effects of VIAGRA: headache; flushing; upset stomach; abnormal vision, such as adjustments in color vision (such as using a blue colour tinge) and blurred vision; stuffy or runny nose; again agony; muscle mass soreness; nausea; dizziness; rash. The most common Unintended effects of VIAGRA: headache; https://robertj654dzv8.wikimillions.com/user