Doxycycline and Carbamazepine Interaction
Drug interaction information between Doxycycline and Carbamazepine.
Doxycycline and Carbamazepine have a documented minor interaction in FDA labeling.
FDA drug labeling documents a minor-severity interaction between Doxycycline and Carbamazepine. Major interactions are generally avoided, moderate ones may need monitoring or a dose adjustment, and minor ones are usually low-risk. This page shows the documented mechanism and guidance. Label-documented interactions are not a complete safety review, so always confirm your own medications with a pharmacist or doctor. Educational information, not medical advice.
How They Interact
Carbamazepine causes your body to process and get rid of doxycycline faster than it should.
What To Do
Your doctor may need to adjust your doxycycline dose or monitor how well the treatment is working.
FDA Label Information
Barbiturates, carbamazepine, and phenytoin decrease the half-life of doxycycline.
Doxycycline Also Interacts With
- Tetracycline moderate
- Rifampin moderate
- Bismuth Subsalicylate minor
- Phenytoin minor
- Doxycycline Hyclate minor
Carbamazepine Also Interacts With
- Nirmatrelvir/Ritonavir major
- Ranolazine major
- Risperidone major
- Lithium moderate
- Apixaban moderate
Frequently Asked Questions
Can I take Doxycycline and Carbamazepine together?
This is a minor interaction. Your doctor may need to adjust your doxycycline dose or monitor how well the treatment is working.
How serious is the interaction between Doxycycline and Carbamazepine?
This interaction is classified as "minor" severity by the FDA. Minor interactions are unlikely to cause significant problems but should still be mentioned to your healthcare provider.
Why do Doxycycline and Carbamazepine interact?
Carbamazepine causes your body to process and get rid of doxycycline faster than it should.
Understanding the Doxycycline and Carbamazepine Interaction
FDA-approved prescribing information for these two drugs flags their combination as a minor-severity interaction. Doxycycline belongs to the Tetracycline Antibiotic class and Carbamazepine belongs to the Anticonvulsant class - two categories that can collide when co-prescribed. The mechanism described in FDA labeling is: Carbamazepine causes your body to process and get rid of doxycycline faster than it should. Severity tiers matter: major flags generally advise avoidance, moderate flags often require monitoring or dose adjustment, and minor flags may only call for awareness.
Context around a specific patient determines real-world impact. Doxycycline has 9 total documented interactions on file in this dataset, and Carbamazepine has 129. Each additional medication compounds the interaction surface, which is why pharmacists run full-profile checks rather than evaluating one pair at a time. FDA-derived guidance for this pair is: Your doctor may need to adjust your doxycycline dose or monitor how well the treatment is working. Timing of doses, renal and hepatic function, age, and other concurrent prescriptions all shape whether a labeled interaction matters clinically.
An interaction flag is not a verdict. A large share of labeled interactions are managed routinely in clinical practice, the fix may be as simple as spacing doses or adding a monitoring test. Others require the prescriber to choose a different medication entirely. This page surfaces FDA-sourced labeling and openFDA data for educational purposes only; it is not medical advice and cannot account for your full clinical picture. Never start, stop, or adjust either Doxycycline or Carbamazepine based on a web page, speak with your prescriber or pharmacist before making any change.
Sources: FDA Drug Labels (SPL) via openFDA (2026). This is for informational purposes only and is not medical advice. Always consult your healthcare provider about drug interactions.
Read our methodology - how this data is sourced, computed, and verified.