Acetaminophen And Codeine and Buprenorphine: 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
Buprenorphine
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.
Your Tylenol with Codeine and buprenorphine can push against each other in a couple of important ways. Buprenorphine grabs onto the same opioid spots that codeine needs to work, so it can actually block codeine's pain relief and may even trigger withdrawal feelings like sweating, chills, or an upset stomach.
At the same time, both are opioids, so taken together they can add up and cause heavy drowsiness, very slow breathing, or a big drop in blood pressure. There is also a small chance of serotonin problems. The good news is your care team can manage this safely by keeping doses low, watching you closely, and choosing the right plan. Please talk with your pharmacist or doctor before combining them.
Direction: Buprenorphine (high-affinity partial mu-agonist/antagonist) competitively displaces codeine (a prodrug requiring CYP2D6 activation to morphine) at opioid receptors, potentially reducing codeine analgesia and precipitating withdrawal. Concurrently, additive CNS depression raises risk of respiratory depression, profound sedation, hypotension, coma, and death; additive serotonergic activity poses serotonin syndrome risk.
- Evidence: theoretical; onset: unspecified; severity: major.
- Management: avoid unless alternatives inadequate; use lowest effective dose and shortest duration; monitor closely for sedation/respiratory depression, especially at initiation/titration; consider naloxone co-prescribing; discontinue codeine if serotonin syndrome suspected.
What happens
Reduced analgesic effect and/or precipitation of withdrawal symptoms, an increased risk of serotonin syndrome and an increased risk of hypotension, respiratory depression, profound sedation, coma, and death
Interaction Deep Dive
Avoid concomitant use of codeine with buprenorphine (a serotonergic CNS depressant and a mixed opioid agonist/antagonist or a partial agonist opioid analgesic) as this may reduce the analgesic effect of codeine and may precipitate withdrawal symptoms, increase the risk for serotonin syndrome and may increase the risk of hypotension, respiratory depression, profound sedation, coma, and death. Reserve concomitant prescribing of these drugs for use in patients for whom alternative treatment options are inadequate. Limit dosages and durations to the minimum required. Follow patients closely for signs of respiratory depression and sedation. If concomitant use is warranted, carefully observe the patient, particularly during treatment initiation and dose adjustment. Discontinue codeine if serotonin syndrome is suspected and consider prescribing naloxone for the emergency treatment of opioid overdose1.
Why it happens (mechanism)
Competitive binding at opioid receptors; additive serotonergic effects; additive CNS depression
How to manage this interaction
Keep taking both exactly as prescribed and do not stop or change either one on your own. This combination is usually avoided unless your care team decides other options are not enough.
- Your team may use the lowest effective dose for the shortest time and monitor you more closely, especially when starting or adjusting doses.
- Your doctor may consider prescribing naloxone as an emergency backup.
- Get help right away for very slow or shallow breathing, extreme drowsiness, confusion, fainting, or symptoms like agitation, fever, shivering, or a racing heart.
Ask your pharmacist or prescriber whether a different pain option might be safer for you.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Acetaminophen And Codeine and Buprenorphine together?
Combining codeine with buprenorphine can weaken codeine's pain relief, trigger withdrawal, and add dangerous sedation and slowed breathing, so it is generally avoided. Let your pharmacist or doctor guide any use of both together. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Acetaminophen And Codeine 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 Acetaminophen And Codeine and Buprenorphine interaction managed?
Keep taking both exactly as prescribed and do not stop or change either one on your own. This combination is usually avoided unless your care team decides other options are not enough. Your team may use the lowest effective dose for the shortest time and monitor you more closely, especially when starting or adjusting doses. Your doctor may consider prescribing naloxone as an emergency backup. Get… 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 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: CARISOPRODOL, ASPIRIN, CODEINE PHOSPHATE oral tablets, carisoprodol, aspirin, codeine phosphate oral tablets. Ingenus Pharmaceuticals LLC (per DailyMed), Orlando, FL, 2021. DailyMed
Keep reading about Acetaminophen And Codeine
Keep reading about Buprenorphine
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major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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