felbamate vs oxcarbazepine
Side-by-side comparison of felbamate and oxcarbazepine Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
Felbatol
Trileptal
Felbamate is a medicine used to treat seizures. It is usually only prescribed when other treatments haven't worked well enough due to the risk of serious side effects.
Oxcarbazepine is a medicine used to treat seizures. It helps to control seizures in adults and children.
Felbamate treats partial seizures in adults, both with and without generalization. It is also used as an add-on treatment for seizures related to Lennox-Gastaut syndrome in children. Because of the risk of very serious side effects, you should only use this medicine if other treatments have not worked well enough.
Oxcarbazepine is used to treat partial-onset seizures. These seizures start in one part of the brain. It can be used alone or with other seizure medicines.
Felbamate is an anticonvulsant, meaning it helps to control seizures. The exact way it works in the brain is not fully understood. It is thought to affect certain chemicals in the brain that are involved in seizures.
Oxcarbazepine works by reducing the electrical activity in the brain. This helps to prevent seizures. It stabilizes overexcited nerve cells.
- • Loss of appetite
- • Vomiting
- • Trouble sleeping
- • Feeling sick to your stomach
- • Headache
- • Dizziness
- • Sleepiness
- • Double vision
- • Feeling tired
- • Nausea
- Seizure 345
- Medicine not working 251
- Convulsion 124
- Using the medicine for something it's not approved for 115
- Sleepiness 108
- Medicine not working 2,868
- Seizure 2,805
- Using medicine for unapproved purpose 1,618
- Tiredness 1,607
- Feeling dizzy 1,519
Felbamate can cause a severe type of anemia called aplastic anemia. This condition is very serious and can be deadly. Because of this risk, felbamate should only be used if your epilepsy is very severe and other treatments have not worked. Felbamate can also cause liver failure. Talk to your doctor about these risks before starting felbamate.
This medicine can cause low sodium levels in your blood. Your doctor should check your sodium levels, especially if you take other medicines that can also lower sodium. This medicine may cause suicidal thoughts or actions. Contact your doctor right away if you have any sudden changes in mood, thoughts, or feelings.
It is not known if felbamate can harm an unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant. It is also not known if felbamate passes into breast milk, so talk to your doctor if you are breastfeeding.
Oxcarbazepine may harm your unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant. There is a pregnancy registry for women who take this medicine during pregnancy. You can enroll by calling 1-888-233-2334.
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How to Read This felbamate vs oxcarbazepine Comparison
felbamate is classified in the Anticonvulsant drug class, while oxcarbazepine sits within the Anticonvulsant class. Because both drugs share the same classification, they are often considered interchangeable in theory — but clinical outcomes rarely track that cleanly. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, felbamate has 943 submissions while oxcarbazepine has 10,417. Those figures reflect cumulative reporting volume — not per-patient risk — so older, widely dispensed drugs typically look worse on count alone. No direct interaction between these two drugs is listed in our FDA-derived dataset, though co-prescription still warrants pharmacist review. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between felbamate and oxcarbazepine — always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.