?? ??? ????? ??? ????????? ?? ?????? ????? ?????? ?? ??? ???? ?? ????? ?????.The commonest side effects of VIAGRA: headache; flushing; upset tummy; irregular eyesight, for example modifications in color eyesight (such as having a blue colour tinge) and blurred vision; stuffy or runny nose; again ache; muscle mass suffering; nausea; dizziness; rash.