Are allergic to sildenafil, as contained in VIAGRA and Revatio®, or any from the substances in VIAGRA The commonest side effects of VIAGRA: headache; flushing; upset abdomen; irregular eyesight, like adjustments in shade vision (for instance possessing a blue colour tinge) and blurred eyesight; stuffy or runny nose; back again https://spencerdujzm.mybuzzblog.com/15004108/what-does-gambling-mean