carbamazepine vs oxybutynin
Side-by-side comparison of carbamazepine and oxybutynin. 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
Drugs that have been shown, or would be expected, to increase plasma carbamazepine levels include aprepitant, cimetidine, ciprofloxacin, danazol, diltiazem, macrolides (e.g., erythromycin, clarithromycin), fluoxetine, fluvoxamine, trazodone, omeprazole, oxybutynin, isoniazid, niacinamide (nicotinamide), azoles (e.g., ketaconazole, itraconazole, fluconazole, voriconazole), acetazolamide, verapamil, ticlopidine, grapefruit juice, and protease inhibitors.
Recommendation: Your doctor may need to check your blood levels and watch for signs of carbamazepine toxicity.
Tegretol
Ditropan
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.
Oxybutynin extended-release tablets help control an overactive bladder. It reduces the feeling of needing to go to the bathroom often.
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.
This medicine treats overactive bladder. It helps with symptoms like needing to urinate frequently, feeling a sudden urge to urinate, and leaking urine. It can also treat overactive bladder in children 6 years and older caused by nerve problems.
Carbamazepine is an anticonvulsant. It works by reducing the spread of seizure activity in the brain. It also stabilizes nerve impulses to reduce pain.
Oxybutynin belongs to a class of drugs called antimuscarinics. It works by relaxing the bladder muscles. This helps to decrease the urge to urinate and prevent leakage.
- • Dizziness
- • Drowsiness
- • Unsteadiness
- • Nausea
- • Vomiting
- • Dry mouth
- • Constipation
- • Diarrhea
- • Headache
- • Feeling sleepy
- Seizure 3,609
- Interaction with another medicine 3,369
- Fall 3,044
- Dizziness 2,860
- Fever 2,690
- Feeling tired 1,539
- Falling down 1,466
- Feeling sick to your stomach 1,211
- Feeling unsteady or lightheaded 1,143
- Loose, watery stools 1,078
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.
Oxybutynin can cause swelling of the face, lips, tongue, and throat (angioedema). If this happens, stop taking the medicine right away and get medical help. This medicine can also cause confusion, hallucinations, and drowsiness. Be careful driving or operating machinery until you know how it affects you. Use caution if you have dementia, Parkinson's disease, myasthenia gravis, or decreased gut motility.
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 this medicine will harm your unborn baby. Talk to your doctor if you are breastfeeding.
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How to Read This carbamazepine vs oxybutynin Comparison
carbamazepine is classified in the Anticonvulsant drug class, while oxybutynin sits within the Anticholinergic / Antispasmodic 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 oxybutynin has 6,437. 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 oxybutynin can increase the amount of carbamazepine in your blood by slowing down its removal from your body.. 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 oxybutynin - 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.