Key facts
- Headache, flushing, a stuffy nose and indigestion are common.
- Tadalafil can also cause back pain and muscle aches.
- Sildenafil can cause temporary changes in vision, such as blurring.
- Tell your prescriber if side effects bother you or don't go away.
Sildenafil
Common side effects include:
- headaches
- dizziness
- a stuffy nose
- an upset stomach
- temporary changes in vision, such as blurred vision
Tadalafil
Common side effects include:
- indigestion
- muscle aches and back pain
- headache
- a stuffy nose
What to do
Side effects are usually mild. Tell your prescriber if they bother you or don't go away. Don't take an extra dose to try to improve how well a medicine works.
If you notice anything on our urgent warning signs list, get help straight away.