The potential melanoma connection is only the latest in a long list of serious Viagra side effects, which include:7
An erection that will not go away (priapism). If not treated right away, priapism can permanently damage your penis.
Sudden vision loss in one or both eyes, which can be a sign of a serious eye problem called non-arteritic anterior ischemic optic neuropathy (NAION).
Sudden hearing decrease or hearing loss, ringing in your ears (tinnitus), or dizziness.
If you take other medications, be aware that Viagra interacts with many and may cause even more side effects. This includes medications such as nitrates, alpha-blockers, HIV protease inhibitors, certain antibiotics and oral anti-fungal medicines, high blood pressure drugs, and more. Other commonly reported side effects include:
Abnormal vision, such as changes in color vision (having a blue color tinge) and blurred vision Stuffy or runny nose Back pain