Call your doctor right away if you have serious side effects. Call 911 if your symptoms feel life-threatening or if you think you’re having a medical emergency.
Serious side effects and their symptoms can include the following:
- Priapism (in men). Symptoms can include:
- a painful erection that won’t go away
- Vision changes. Symptoms can include:
- seeing a shade of blue when looking at objects
- trouble telling the difference between the colors blue and green
- a sudden decrease or loss of vision in one or both eyes
- Hearing loss. Symptoms can include:
- a sudden loss or decrease in hearing
- ringing in the ears
- dizziness
- Low blood pressure. Symptoms can include:
- feeling lightheaded or dizzy
- fainting
- Angina (chest pain)