Clindamycin and Carbamazepine: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 1, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Carbamazepine
Clindamycin
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
Here is what is going on if you take carbamazepine (Tegretol) and the antibiotic clindamycin (Cleocin) together. Carbamazepine speeds up a liver enzyme that helps break down clindamycin. That means your body may clear the antibiotic faster than usual, so there could be less of it in your system to fight your infection.
The good news is that this concern is mostly theoretical, so it may not cause a real problem for you. But because an antibiotic only works if there is enough of it, this is worth a quick conversation. Please keep taking both exactly as prescribed and let your doctor or pharmacist know you are on both so they can watch how you respond.
Mechanism: Carbamazepine is a strong CYP3A4 inducer; clindamycin is partly a CYP3A4 substrate. Induction increases clindamycin metabolism, lowering its exposure (reduced AUC/Cmax) and potentially its antibacterial efficacy.
- Direction: reduced clindamycin effect (increased clearance, subtherapeutic exposure risk).
- Onset: unspecified; enzyme induction is typically delayed (days).
- Evidence: theoretical.
- Magnitude: not quantified.
Management: Monitor clinical response to clindamycin; the dose may need to be adjusted and individualized by the care team, or an alternative antibiotic considered if response is inadequate.
What happens
Reduced CYP3A4 substrate exposure and reduced efficacy of CYP3A4 substrate
Interaction Deep Dive
When carBAMazepine (a potent inducer of CYP3A4) is taken together with a substrate of CYP3A4, exposure to that CYP3A4 substrate may decline. Should the two be given together, keep a close watch on levels of the CYP3A4 substrate and, if warranted, adjust the dose12.
Why it happens (mechanism)
Induction of CYP3A4-mediated metabolism by carBAMazepine
How to manage this interaction
This interaction is manageable, and your care team has good options.
- Keep taking both as prescribed unless your prescriber tells you otherwise.
- Your team may monitor how well the antibiotic is working (watching that your infection is improving as expected).
- If needed, your clindamycin dose may be adjusted and individualized, or a different antibiotic chosen.
What to do: Tell your pharmacist and prescriber you take both drugs. Let them know if your infection is not improving, seems to get worse, or symptoms come back.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Clindamycin and Carbamazepine together?
Carbamazepine can speed up how your body clears clindamycin, which may make the antibiotic less effective, though this concern is theoretical. Keep taking both as prescribed and tell your care team so they can monitor your response and adjust if needed. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Clindamycin and Carbamazepine interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Clindamycin and Carbamazepine interaction managed?
This interaction is manageable, and your care team has good options. Keep taking both as prescribed unless your prescriber tells you otherwise. Your team may monitor how well the antibiotic is working (watching that your infection is improving as expected). If needed, your clindamycin dose may be adjusted and individualized, or a different antibiotic chosen. What to do: Tell your pharmacist and pr… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Clindamycin or Carbamazepine need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there a safer alternative to one of these medications for me?
References (2)
- Product Information: Tegretol(R)-XR oral extended-release tablets, carbamazepine oral extended-release tablets. Novartis Pharmaceuticals Corporation (per FDA), East Hanover, NJ, 2023. DailyMed
- Product Information: Tegretol(R) oral chewable tablets, oral tablets, oral suspension, carbamazepine oral chewable tablets, oral tablets, oral suspension. Novartis Pharmaceuticals Corporation (per FDA), East Hanover, NJ, 2023. DailyMed
Keep reading about Carbamazepine
Keep reading about Clindamycin
These medications also interact with supplements
Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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