The Most common Negative effects of VIAGRA: headache; flushing; upset abdomen; abnormal vision, such as adjustments in color eyesight (including having a blue shade tinge) and blurred vision; stuffy or runny nose; again ache; muscle suffering; nausea; dizziness; rash. The most typical Unwanted side effects of VIAGRA: headache; flushing; upset Bangla Choti