Mavorixafor and Buprenorphine: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 2, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Buprenorphine
Mavorixafor
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.
Both buprenorphine (a pain and opioid-dependence medicine) and mavorixafor (Xolremdi) can each affect your heart's electrical rhythm in a way doctors call QT prolongation. When you take them together, that effect can add up, which slightly raises the chance of a dangerous irregular heartbeat.
Right now this concern is based on how these drugs work rather than lots of real-world reports, so please don't panic. Your care team can manage this well, often with a simple heart tracing (an ECG) and by keeping an eye on things. Keep taking both exactly as prescribed, and tell your doctor if you feel fainting, dizziness, or a fluttering or pounding heartbeat.
Effect: Additive QT interval prolongation, with increased theoretical risk of torsade de pointes and other serious arrhythmias.
Mechanism/direction: Both agents independently prolong the QT interval; combined use produces additive PD effect. Neither is a prodrug relevant here.
Evidence: Theoretical; severity rated major. Onset unspecified.
Management:
- Obtain baseline and follow-up ECGs during coadministration.
- Correct modifiable risk factors (hypokalemia, hypomagnesemia, bradycardia, other QT-prolonging drugs).
- Monitor closely; mavorixafor dose reduction or discontinuation may be required per labeling.
What happens
An increased risk of QT interval prolongation and torsade de pointes
Interaction Deep Dive
When mavorixafor is given together with other agents that prolong the QT interval, the likelihood of QT prolongation rises, which encompasses torsade de pointes, additional serious arrhythmias, and sudden death. During such coadministration, consider performing electrocardiograms, addressing any modifiable QT prolongation risk factors, and monitoring the patient. It may become necessary to reduce the dose of mavorixafor or stop it altogether1.
Why it happens (mechanism)
Additive QT interval prolongation
How to manage this interaction
Good news: this is a manageable situation, and you should keep taking both medicines as prescribed unless your prescriber tells you otherwise.
Your care team typically will:
- Order an ECG (heart tracing) to check your heart rhythm.
- Fix things that add to the risk, like low potassium or magnesium.
- Monitor you more closely, and if needed, adjust or pause the mavorixafor dose, which they will individualize for you.
Ask your pharmacist or doctor about any other medicines you take that affect heart rhythm, and report fainting, dizziness, or palpitations right away.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Mavorixafor and Buprenorphine together?
Buprenorphine and mavorixafor can each prolong the QT interval, so together they may raise the risk of a dangerous heart rhythm; keep taking both as prescribed and let your care team monitor you with ECGs and adjust the mavorixafor dose if needed. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Mavorixafor and Buprenorphine 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 Mavorixafor and Buprenorphine interaction managed?
Good news: this is a manageable situation, and you should keep taking both medicines as prescribed unless your prescriber tells you otherwise. Your care team typically will: Order an ECG (heart tracing) to check your heart rhythm. Fix things that add to the risk, like low potassium or magnesium. Monitor you more closely, and if needed, adjust or pause the mavorixafor dose, which they will individu… 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.
Questions for your pharmacist
- Does my dose of Mavorixafor or Buprenorphine 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: XOLREMDI(TM) oral capsules, mavorixafor oral capsules. X4 Pharmaceuticals, Inc. (Per FDA), Boston, MA, 2024. DailyMed
Keep reading about Buprenorphine
Keep reading about Mavorixafor
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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