Clindamycin and Sevabertinib: 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
Clindamycin
Sevabertinib
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's what's going on: Sevabertinib (Hyrnuo) can slow down a liver enzyme called CYP3A4. Your body uses that same enzyme to break down clindamycin. When the enzyme is slowed, clindamycin can build up in your body a bit more than usual, which may raise the chance of side effects like stomach upset, diarrhea, or other clindamycin-related reactions.
The good news is this is very manageable. Please don't stop or change either medicine on your own. Just let your pharmacist or doctor know you're taking both. They can watch you a little more closely, adjust things if needed, or pick a different antibiotic if that makes sense for you.
Mechanism: Sevabertinib inhibits CYP3A-mediated metabolism, increasing exposure to CYP3A substrates. In a study, sevabertinib 20 mg BID raised midazolam AUC ~2-fold and Cmax ~1.8-fold.
Direction: Clindamycin is partly CYP3A4-metabolized, so co-administration may increase clindamycin exposure and adverse-reaction risk (GI toxicity, C. difficile risk).
- Severity: Major
- Evidence: Probable
- Onset: Unspecified
Management: Labeling advises avoiding sevabertinib with narrow-therapeutic-index CYP3A substrates. Assess necessity; consider an alternative antibiotic or closer clinical monitoring. Dose may need individualization by the care team.
What happens
Increased CYP3A substrate with NTI exposure and an increased risk of CYP3A4 substrates with NTI-related adverse reactions
Interaction Deep Dive
Concurrent administration of sevabertinib with CYP3A substrates that have a narrow therapeutic index (NTI) should be avoided, since it can raise exposure to the NTI CYP3A substrate and thereby heighten the likelihood of adverse reactions related to that substrate. When sevabertinib 20 mg twice daily was given together with midazolam in a drug interaction study, the AUC of midazolam (a CYP3A substrate) rose 2-fold and its Cmax increased 1.8-fold1.
Why it happens (mechanism)
Inhibition of CYP3A-substrate metabolism by sevabertinib
How to manage this interaction
What your care team may do:
- Review whether both drugs are truly needed together, since guidance favors avoiding this combination with sensitive CYP3A substrates.
- Consider an alternative antibiotic if one is appropriate for you.
- Monitor you more closely for clindamycin-related side effects if you do take both, and adjust and individualize dosing as needed.
What you should do:
- Keep taking both exactly as prescribed unless your prescriber tells you otherwise.
- Tell your pharmacist and doctor you're on both medicines.
- Report worsening diarrhea, severe stomach pain, or other new symptoms promptly.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) In a study of drug interactions, taking sevabertinib 20 mg twice daily together with midazolam raised the AUC of midazolam (a CYP3A substrate) by 2-fold and its Cmax by 1.8-fold 1.
Common questions
Can I take Clindamycin and Sevabertinib together?
Sevabertinib can raise clindamycin levels by slowing its breakdown, so guidance is to avoid pairing them when possible; tell your pharmacist or doctor and watch for side effects rather than changing anything yourself. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Clindamycin and Sevabertinib 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 Sevabertinib interaction managed?
What your care team may do: Review whether both drugs are truly needed together, since guidance favors avoiding this combination with sensitive CYP3A substrates. Consider an alternative antibiotic if one is appropriate for you. Monitor you more closely for clindamycin-related side effects if you do take both, and adjust and individualize dosing as needed. What you should do: Keep taking both exact… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "probable". Good supporting evidence, though not definitively proven.
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 Sevabertinib 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 (1)
- Product Information: HYRNUO® oral tablets, sevabertinib oral tablets. Bayer HealthCare Pharmaceuticals Inc. (per FDA), Whippany, NJ, 2025. DailyMed
Keep reading about Clindamycin
Keep reading about Sevabertinib
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