Acetaminophen And Codeine and Sertraline: 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
Sertraline
No brand names on record
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 pain medicine contains codeine, which your body has to convert into its active form (morphine) to relieve pain. Sertraline can slow down the liver enzyme that makes this conversion. That means codeine may give you less pain relief, and if you have been taking it regularly, you could feel early withdrawal.
There is also a second concern. Both drugs affect serotonin, a brain chemical, so together they can rarely cause a reaction called serotonin syndrome (agitation, shivering, fast heartbeat, sweating, muscle twitching). This is mostly a theoretical risk, and your care team can manage both issues by watching you closely and adjusting your dose if needed. Never change either medicine on your own.
Two overlapping mechanisms:
- PK: Codeine is a prodrug requiring CYP2D6 activation to morphine. Sertraline is a mild-to-moderate CYP2D6 inhibitor, so expect increased codeine parent exposure and reduced morphine formation, potentially lowering analgesic efficacy or precipitating withdrawal in dependent patients.
- PD: Additive serotonergic effect raises theoretical risk of serotonin syndrome.
Severity: major; evidence: theoretical; onset: unspecified.
Management: If used together, monitor for reduced analgesia/withdrawal and consider increasing the codeine dose. On stopping sertraline, reduce codeine and monitor for respiratory depression. Observe for serotonin syndrome, especially at initiation/dose changes; discontinue codeine if suspected.
What happens
Increased risk of serotonin syndrome, increased codeine exposure and reduced active metabolite (morphine) exposure
Interaction Deep Dive
When codeine is taken together with a CYP2D6 inhibitor, the plasma levels of morphine (the active metabolite formed from codeine) may fall, which could diminish therapeutic effect or trigger a withdrawal syndrome in patients who have become physically dependent. Should this combination be required, watch patients for signs of withdrawal and think about raising the codeine dose. After the CYP2D6 inhibitor is stopped, consider lowering the codeine dose and observe for respiratory depression. Serotonin syndrome has also occurred when opioids are used alongside serotonergic agents. If such combined use is necessary, monitor the patient closely, especially when starting therapy and when adjusting doses. If serotonin syndrome is suspected, discontinue codeine12.
Why it happens (mechanism)
Additive serotonergic effects; inhibition of CYP2D6-mediated codeine metabolism
How to manage this interaction
Keep taking both exactly as prescribed unless your prescriber tells you otherwise. Here is how a care team usually handles this:
- They may watch whether your pain relief is weaker than expected, since sertraline can reduce codeine's active effect.
- Your codeine dose may need to be adjusted and individualized by your team, and they may monitor you more closely, especially when starting, stopping, or changing either drug.
- Tell your team right away about agitation, shivering, sweating, a racing heart, or muscle twitching, which can signal serotonin syndrome.
Ask your pharmacist or doctor before making any changes.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Acetaminophen And Codeine and Sertraline together?
Sertraline can weaken codeine's pain relief and, rarely, add to serotonin-related side effects, so keep taking both as prescribed and let your care team monitor and adjust your dose. Report any weak pain control, withdrawal feelings, or agitation, shivering, and racing heart. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Acetaminophen And Codeine and Sertraline 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 Sertraline interaction managed?
Keep taking both exactly as prescribed unless your prescriber tells you otherwise. Here is how a care team usually handles this: They may watch whether your pain relief is weaker than expected, since sertraline can reduce codeine's active effect. Your codeine dose may need to be adjusted and individualized by your team, and they may monitor you more closely, especially when starting, stopping, or… 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.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Acetaminophen And Codeine or Sertraline 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 (2)
- Product Information: Codeine sulfate oral solution, codeine sulfate oral solution. Hikma Pharmaceuticals USA Inc(per FDA), Berkeley Heights, NJ, 2023. DailyMed
- Product Information: Codeine sulfate oral tablets, codeine sulfate oral tablets. Hikma Pharmaceuticals USA Inc. (per FDA), Berkeley Heights, NJ, 2023. DailyMed
Keep reading about Acetaminophen And Codeine
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