Medical attention

Medical attention should be sought immediately if any of the following side effects occur during sexual activity:

Other rarely reported, but serious, side effects requiring immediate medical attention include:

Priapism - erections lasting longer than four hours
Sudden vision loss in one or both eyes, which is a symptom of a serious eye problem called non-arteric anterior ischemic optic neuropathy (NAION)
Sudden hearing decrease, hearing loss, or ringing in the ears

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