Oxtellar XR (oxcarbazepine) can cause side effects that range from mild to serious. More common side effects include dizziness and extreme sleepiness. If side effects from Oxtellar XR become difficult ...

If you have a certain kind of seizure that occurs with epilepsy, your doctor may prescribe Oxtellar XR for you. It’s a prescription drug used to treat focal onset seizures in adults and some children.