VIAGRA shouldn't be employed with REVATIO or with other PAH therapies containing sildenafil or some other PDE5 inhibitors (including Adcirca® [tadalafil]) The commonest Uncomfortable side effects of VIAGRA: headache; flushing; upset stomach; abnormal vision, for example variations in color vision (which include possessing a blue color tinge) and blurred eyesight; https://buzzt384ige7.wikicorrespondence.com/user