Epilepsy Home > Oxtellar XR Side Effects

If you are taking Oxtellar XR and experience confusion, fever, or more frequent seizures, contact your healthcare provider right away. Dangerous problems can occur with this anti-seizure drug, so it is important to know which reactions require urgent medical treatment. Some of the other possible side effects of Oxtellar XR include headaches, drowsiness, and dizziness.

An Introduction to Oxtellar XR Side Effects

As with any medicine, Oxtellar XR™ (oxcarbazepine extended-release) can cause side effects. However, not everyone who takes the medication will have problems. In fact, most people tolerate it quite well. If reactions do occur, in most cases, they are minor and either require no treatment or are treated easily by you or your healthcare provider.
(This article covers many, but not all, of the possible side effects with Oxtellar XR. Your healthcare provider can discuss a more complete list with you.)

Common Side Effects With Oxtellar XR

Oxtellar XR has been studied extensively in clinical trials. In these studies, the side effects that occurred in a group of people taking Oxtellar XR were carefully documented and compared to the side effects that occurred in a similar group of people taking a placebo (a "sugar pill" with no active ingredients). As a result, it was possible to see what side effects occurred, how often they appeared, and how they compared to the placebo.
In these studies, the most common side effects of this drug included:
  • Dizziness -- in up to 41 percent of people
  • Headache -- up to 15 percent
  • Vomiting -- up to 15 percent
  • Drowsiness -- up to 14 percent
  • Double vision -- up to 13 percent
  • Balance problems -- up to 7 percent
  • Loss of strength and energy -- up to 7 percent
  • Fatigue -- up to 6 percent
  • Tremor -- up to 5 percent.
Other common side effects, occurring in 2 percent to 4 percent of people, included:
  • Blurred vision
  • Uncontrollable eye movements (nystagmus)
  • Loss of muscle coordination
  • Upper abdominal (stomach) pain
  • Heartburn or indigestion
  • Inflammation of the lining of the stomach
  • Vision impairment
  • Problems moving or walking
  • Symptoms of the common cold, such as a runny nose, nasal congestion, or sneezing
  • General intolerance to taking the medication.
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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