carbamazepine vs zonisamide
Side-by-side comparison of carbamazepine and zonisamide. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
minor Known Drug Interaction
In addition, carbamazepine causes, or would be expected to cause, decreased levels of the following drugs, for which monitoring of concentrations or dosage adjustment may be necessary: acetaminophen, albendazole, alprazolam, aprepitant, buprenorphone, bupropion, citalopram, clonazepam, clozapine, corticosteroids (e.g., prednisolone, dexamethasone), cyclosporine, dicumarol, dihydropyridine calcium channel blockers (e.g., felodipine), doxycycline, ethosuximide, everolimus, haloperidol, imatinib, itraconazole, lamotrigine, levothyroxine, methadone, methsuximide, mianserin, midazolam,...
Recommendation: Your doctor may need to monitor your blood levels or adjust your dose of zonisamide.
Tegretol
Zonegran
Carbamazepine is a medicine used to control seizures and treat nerve pain. It works by reducing abnormal electrical activity in the brain and calming nerve signals.
Zonisamide is a medicine used with other medicines to treat partial seizures in adults with epilepsy. It belongs to a class of drugs called anticonvulsants.
Carbamazepine is used to treat certain types of seizures, including partial seizures and generalized tonic-clonic seizures. It can also treat mixed seizure patterns. Carbamazepine also treats the pain from trigeminal neuralgia, a nerve disorder that causes intense facial pain. It is also sometimes used for glossopharyngeal neuralgia.
Zonisamide is used to treat partial seizures in adults who have epilepsy. Epilepsy is a brain disorder that causes repeated seizures. This medicine is used along with other seizure medicines to help control your seizures.
Carbamazepine is an anticonvulsant. It works by reducing the spread of seizure activity in the brain. It also stabilizes nerve impulses to reduce pain.
Zonisamide works by slowing down the electrical signals in the brain that cause seizures. It is thought to stabilize nerve cell membranes, which reduces the chance of seizures. It may also affect certain chemicals in the brain.
- • Dizziness
- • Drowsiness
- • Unsteadiness
- • Nausea
- • Vomiting
- • Feeling sleepy
- • Loss of appetite
- • Dizziness
- • Problems with coordination
- • Feeling agitated or irritable
- Seizure 3,609
- Interaction with another medicine 3,369
- Fall 3,044
- Dizziness 2,860
- Fever 2,690
- Seizure 1,574
- Tiredness 696
- Sleepiness 645
- Convulsion 622
- Feeling dizzy 558
Carbamazepine can cause severe skin reactions, including Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN), which can be fatal. If you are of Asian descent, you may need a blood test before starting this medicine. Carbamazepine can also cause serious blood problems like aplastic anemia and agranulocytosis. Contact your doctor right away if you develop a fever, sore throat, rash, or unusual bleeding or bruising.
If you are allergic to sulfonamide medicines, you should not take zonisamide. Using zonisamide with other medicines that also inhibit carbonic anhydrase (like topiramate) can increase the risk of metabolic acidosis, kidney stones, and high ammonia levels in the blood.
Carbamazepine may harm an unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant. It is not known if carbamazepine passes into breast milk, so talk to your doctor about breastfeeding.
Tell your doctor if you are pregnant or plan to become pregnant. It is not known if zonisamide will harm your unborn baby. Talk to your doctor about the risks and benefits of taking zonisamide during pregnancy. It is also not known if zonisamide passes into breast milk, so talk to your doctor before breastfeeding.
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How to Read This carbamazepine vs zonisamide Comparison
carbamazepine is classified in the Anticonvulsant drug class, while zonisamide sits within the Anticonvulsant (Sulfonamide) class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. 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, carbamazepine has 15,572 submissions while zonisamide has 4,095. Those figures reflect cumulative reporting volume, not per-patient risk, so older, widely dispensed drugs typically look worse on count alone. These two drugs have a known minor interaction flagged in FDA labeling, attributed to carbamazepine speeds up how quickly your body breaks down zonisamide, which can make the zonisamide less effective.. 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 carbamazepine and zonisamide - 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.