Eslicarbazepine Acetate and Acetaminophen And Codeine: 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
Eslicarbazepine Acetate
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 is a "prodrug." That means your body has to change codeine into its active painkiller (morphine) before it works. Eslicarbazepine (Aptiom) can speed up the liver enzyme that handles codeine, so your body may clear the codeine before it turns into as much morphine.
What this means for you: your pain medicine may not work as well, and if your body is used to the codeine, you could feel withdrawal symptoms like restlessness, sweating, or achiness. The good news is this is manageable. Keep taking both as prescribed and let your care team know if your pain relief drops off, so they can adjust things safely.
Mechanism: Eslicarbazepine acetate induces CYP3A4, accelerating codeine metabolism. Codeine is a prodrug; increased shunting toward norcodeine reduces CYP2D6-mediated conversion to morphine, lowering active opioid exposure.
Direction/effect: Reduced codeine and morphine exposure, reduced analgesic efficacy, and possible opioid withdrawal in physically dependent patients.
Evidence: Theoretical; severity rated major. Onset unspecified.
Management:
- Monitor for reduced analgesia and signs of opioid withdrawal.
- Codeine dose may need upward individualization by the care team if co-administered.
- If eslicarbazepine is discontinued, anticipate rising codeine/morphine levels; consider dose reduction and monitor for sedation and respiratory depression.
What happens
Reduced codeine and morphine exposure, reduced opioid efficacy and precipitation of opioid withdrawal
Interaction Deep Dive
Concomitant use of codeine with CYP3A4 inducers may result in reduced codeine levels, greater norcodeine levels, and less metabolism via CYP2D6 with resultant lower morphine levels, resulting in decreased efficacy or onset of a withdrawal syndrome in patients who have developed physical dependence. If concomitant use is needed, closely monitor patients for decreased efficacy or signs of opioid withdrawal syndrome, and consider increasing the dose of codeine as necessary. If a CYP3A4 inducer is being discontinued, consider codeine dose reduction and closely monitor patients for signs of respiratory depression or sedation12.
Why it happens (mechanism)
Induction of CYP3A4-mediated codeine metabolism
How to manage this interaction
Do not stop or change either medicine on your own. Keep taking both exactly as prescribed and work with your care team.
- Watch for less pain relief or withdrawal symptoms (restlessness, sweating, chills, stomach upset, achiness) and report them.
- Your codeine dose may need to be adjusted and individualized by your prescriber, and your team may monitor you more closely.
- If eslicarbazepine is ever stopped, tell your care team, since the codeine may then become stronger; they may lower your codeine dose and watch for excess sedation or slowed breathing.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Eslicarbazepine Acetate and Acetaminophen And Codeine together?
Eslicarbazepine can speed up how your body handles codeine, so your pain medicine may work less well or trigger withdrawal; keep taking both as prescribed and tell your care team if your pain relief fades so they can adjust safely. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Eslicarbazepine Acetate and Acetaminophen And Codeine 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 Eslicarbazepine Acetate and Acetaminophen And Codeine interaction managed?
Do not stop or change either medicine on your own. Keep taking both exactly as prescribed and work with your care team. Watch for less pain relief or withdrawal symptoms (restlessness, sweating, chills, stomach upset, achiness) and report them. Your codeine dose may need to be adjusted and individualized by your prescriber, and your team may monitor you more closely. If eslicarbazepine is ever sto… 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 Eslicarbazepine Acetate or Acetaminophen And Codeine 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
Keep reading about Eslicarbazepine Acetate
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