Acetaminophen And Codeine and Potassium Oxybate: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jun 30, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Acetaminophen And Codeine
Potassium 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.
These two medicines can add up in a risky way. Tylenol with codeine contains an opioid painkiller (codeine) that can slow your breathing and make you very drowsy. Xywav (potassium oxybate) is a strong sleep medicine that also calms down your brain and breathing. Taken together, they can push those effects too far, leading to heavy sedation, dangerously slow breathing, low blood pressure, fainting, or worse.
Please don't stop or change either medicine on your own. Talk with your doctor or pharmacist. Your care team can safely manage this by adjusting doses, timing, or choosing another option, and they may want you to have naloxone on hand just in case.
Additive CNS depression. Codeine (an opioid; note it is a prodrug activated via CYP2D6 to morphine) plus potassium oxybate (Xywav) produces overlapping PD effects: respiratory depression, profound sedation, hypotension, obtundation, syncope, and potentially death.
- Direction: additive/synergistic CNS and respiratory depression (PD, not a PK/enzyme interaction).
- Severity/Evidence: major; theoretical/mechanistic.
- Onset: unspecified.
- Management: combination generally not recommended. If needed, reduce dose or discontinue one agent; consider interrupting oxybate for short-term/perioperative opioid use. Monitor mental status and respiration; 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
When sodium oxybate or mixed oxybate salts are taken together with other CNS depressants, there is a heightened likelihood of additive CNS depression along with clinically meaningful respiratory depression, obtundation, hypotension, deep sedation, syncope, and death. If combining these CNS depressants with an oxybate cannot be avoided, clinicians should weigh reducing the dose of, or stopping, one or more of the CNS depressants (oxybates included). Furthermore, when an opioid is needed for a brief period (for example, post- or perioperatively), pausing oxybate therapy should be weighed123. Should concurrent use be unavoidable, watch for alterations in mental status and for respiratory depression, proceed with caution in management, and give strong consideration to prescribing naloxone as an emergency intervention for opioid overdose4.
Why it happens (mechanism)
Additive CNS depression
How to manage this interaction
Keep taking both exactly as prescribed unless your care team tells you otherwise, and let them know you use both.
- This combination is generally not recommended, so your team may lower a dose or stop one medicine, or space the timing differently.
- If you need an opioid only briefly (for example, after surgery), your team may pause the oxybate.
- Your team may monitor you more closely for extreme drowsiness or slowed breathing.
- Ask about having naloxone available for emergencies.
Call your doctor or pharmacist before making any change.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Acetaminophen And Codeine and Potassium Oxybate together?
Combining Tylenol with codeine and Xywav can dangerously add up to slow your breathing and heavily sedate you, so this pairing is generally avoided. Don't change either drug yourself; your care team can adjust doses or timing and may recommend keeping naloxone nearby. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Acetaminophen And Codeine and Potassium 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 Acetaminophen And Codeine and Potassium Oxybate interaction managed?
Keep taking both exactly as prescribed unless your care team tells you otherwise, and let them know you use both. This combination is generally not recommended, so your team may lower a dose or stop one medicine, or space the timing differently. If you need an opioid only briefly (for example, after surgery), your team may pause the oxybate. Your team may monitor you more closely for extreme drows… 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 Acetaminophen And Codeine or Potassium 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: 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
- Product Information: SUBUTEX(R) sublingual tablets, buprenorphine sublingual tablets. Indivior Inc (per FDA), North Chesterfield, VA, 2021. DailyMed
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