Cialis® and generic Cialis® can cause serious side effects. Rarely reported side effects include:
-an erection that will not go away (priapism). If you have an erection that lasts more than 4 hours, get medical help right away. If it is not treated right away, priapism can permanently damage your penis.
-sudden vision loss in one or both eyes. Sudden vision loss in one or both eyes can be a sign of a serious eye problem called non-arteritic anterior ischemic optic neuropathy (NAION). It is uncertain whether PDE5 inhibitors directly cause the
vision loss. Stop taking Cialis® and call your healthcare provider right away if you have sudden vision loss in one or both eyes.
-sudden hearing decrease or hearing loss. Some people may also have ringing in their ears (tinnitus) or dizziness. If you
have these symptoms, stop taking Cialis® or generic Cialis® and contact a doctor right away.