Drug interactions
Carbamazepine + Rifampin
Severity: Major
Carbamazepine and Rifampin: major interaction.
Last updated Sources: US FDA label
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Rifampin can substantially lower carbamazepine concentrations and may precipitate breakthrough seizures or loss of mood control. Rifampin's inducing effect develops over days and persists for some time after it is stopped.
What this interaction means in plain words
Carbamazepine and Rifampin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Rifampin is a potent inducer of CYP3A4 and other enzymes, increasing carbamazepine clearance.
What to do
Monitor carbamazepine serum concentrations and clinical response, and increase the dose as needed. Reassess and reduce the dose after rifampin is stopped to avoid toxicity.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
Other interactions of Carbamazepine
- Artemether / lumefantrine + Carbamazepine Contraindicated
- Cabotegravir + Carbamazepine Contraindicated
- Carbamazepine + Delamanid Contraindicated
- Carbamazepine + Dienogest / estradiol valerate Contraindicated
- Carbamazepine + Doravirine Contraindicated
- Carbamazepine + Elbasvir / grazoprevir Contraindicated
Frequently asked questions
Can I take Carbamazepine with Rifampin?
MediHelp rates the interaction as major. Carbamazepine and Rifampin can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Rifampin can substantially lower carbamazepine concentrations and may precipitate breakthrough seizures or loss of mood control. Rifampin's inducing effect develops over days and persists for some time after it is stopped.
How serious is the interaction between Carbamazepine and Rifampin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor carbamazepine serum concentrations and clinical response, and increase the dose as needed. Reassess and reduce the dose after rifampin is stopped to avoid toxicity.
What other medicines interact with Carbamazepine?
MediHelp also lists interactions of Carbamazepine with, for example, Artemether / lumefantrine, Cabotegravir, Delamanid. The full list is on the Carbamazepine page.
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