Buprenorphine and Calcium Oxybate: 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
Calcium Oxybate
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.
Buprenorphine (an opioid used for pain or opioid dependence) and calcium oxybate (Xywav, used for sleep disorders) are both medicines that slow down your brain and body. When you take them together, those slowing effects can add up. That can lead to very deep sleepiness, slowed or shallow breathing, low blood pressure, fainting, or in serious cases, life-threatening problems.
This does not mean you can't be treated safely. Your care team knows how to handle this by adjusting doses, watching you more closely, and sometimes providing naloxone (a rescue medicine) just in case. Please don't stop or change either drug on your own. Talk with your pharmacist or doctor so they can tailor your plan.
Mechanism: Additive CNS depression between buprenorphine (opioid partial agonist) and calcium oxybate (mixed oxybate salt, CNS depressant). Neither is a prodrug relevant here; this is a pharmacodynamic, not pharmacokinetic, interaction.
Effect / direction: Increased risk of respiratory depression, obtundation, hypotension, profound sedation, syncope, and death. Severity: major. Onset: unspecified. Evidence: theoretical.
- Combination is generally not recommended.
- If required, consider dose reduction or discontinuation of one or more CNS depressant (including the oxybate).
- For short-term/perioperative opioid use, consider interrupting oxybate therapy.
- Monitor mental status and respiratory function; strongly consider prescribing naloxone.
What happens
An increased risk of CNS depression and clinically significant respiratory depression, obtundation, hypotension, profound sedation, syncope, and death
Interaction Deep Dive
Taking sodium oxybate or mixed oxybate salts together with other CNS depressants heightens the likelihood of additive CNS depression and clinically meaningful respiratory depression, along with obtundation, hypotension, deep sedation, syncope, and death. When such CNS depressants must be combined with an oxybate, clinicians should weigh reducing the dose or stopping one or more of the CNS depressant agents (oxybates included). Furthermore, when short-term opioid therapy is needed (for example, in the post- or perioperative setting), pausing oxybate treatment should be considered234. Should concurrent use be unavoidable, watch for alterations in mental status and respiratory depression, proceed with caution in management, and give strong consideration to prescribing naloxone for emergency treatment of opioid overdose1.
Why it happens (mechanism)
Additive CNS depression
How to manage this interaction
Both drugs can slow breathing and cause heavy sedation, so this combination is generally not recommended. If your care team decides you need both, here is what they typically do:
- Adjust the dose of one or both medicines, individualized to you.
- Sometimes pause the oxybate if you need an opioid short-term (for example, around surgery).
- Monitor you more closely for excessive sleepiness or slowed breathing.
- Strongly consider prescribing naloxone as an emergency rescue medicine.
What you should do: Keep taking both exactly as prescribed, don't change anything on your own, and let your pharmacist or prescriber know about all sedating medicines, alcohol, or new symptoms like extreme drowsiness.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Buprenorphine and Calcium Oxybate together?
Combining buprenorphine and calcium oxybate can dangerously add up to slow your breathing and deepen sedation, so it is generally avoided. If you must take both, your care team will adjust doses, monitor you closely, and likely provide naloxone, so talk with them before making any changes. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Buprenorphine and Calcium Oxybate 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 Buprenorphine and Calcium Oxybate interaction managed?
Both drugs can slow breathing and cause heavy sedation, so this combination is generally not recommended. If your care team decides you need both, here is what they typically do: Adjust the dose of one or both medicines, individualized to you. Sometimes pause the oxybate if you need an opioid short-term (for example, around surgery). Monitor you more closely for excessive sleepiness or slowed brea… 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 Buprenorphine or Calcium Oxybate 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 (4)
- Product Information: SUBUTEX(R) sublingual tablets, buprenorphine sublingual tablets. Indivior Inc (per FDA), North Chesterfield, VA, 2021. DailyMed
- Product Information: XYWAV(R) oral solution, calcium, magnesium, potassium, sodium oxybates oral solution. Jazz Pharmaceuticals Inc (per manufacturer), Palo Alto, CA, 2023. DailyMed
- Product Information: XYREM(R) oral solution, sodium oxybate oral solution. Jazz Pharmaceuticals Inc (per manufacturer), Palo Alto, CA, 2023. DailyMed
- Product Information: LUMRYZ(TM) oral extended-release suspension, sodium oxybate extended-release suspension. Avadel CNS Phamaceuticals LLC (per FDA), Chesterfield, MO, 2024. DailyMed
Keep reading about Buprenorphine
Keep reading about Calcium Oxybate
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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