Citalopram 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
Citalopram
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, an opioid, and you're also taking citalopram (Celexa) for mood. Both can raise a brain chemical called serotonin. When two medicines do this together, there's a small chance of a reaction called serotonin syndrome.
Signs to watch for include feeling agitated or confused, a fast heartbeat, sweating, shaking, muscle twitching, or a high fever. This is uncommon, and this warning is based mostly on caution rather than lots of cases. The good news is your care team can manage it, especially by watching you closely when either medicine is started or changed. Keep taking both as prescribed, and call your doctor or pharmacist if you notice these symptoms.
Interaction: Additive serotonergic effects between codeine (an opioid with mild serotonergic activity) and citalopram (an SSRI), increasing the theoretical risk of serotonin syndrome.
- Direction: Additive pharmacodynamic effect (increased serotonergic tone), not a PK/enzyme interaction.
- Severity/Evidence: Rated major, but substantiation is theoretical.
- Onset: Unspecified; highest concern during initiation or dose escalation of either agent.
- Management: Coadminister only if needed; monitor for autonomic instability, neuromuscular changes (clonus, hyperreflexia, rigidity), and altered mental status. Discontinue codeine if serotonin syndrome is suspected. Dose may be individualized by the care team.
What happens
Increased risk of serotonin syndrome
Interaction Deep Dive
Concomitant use of opioids, such as codeine, with serotonergic drugs has resulted in serotonin syndrome. If concomitant use is needed, carefully observe the patient, particularly during treatment initiation and dose adjustments. Discontinue codeine if serotonin syndrome is suspected123.
Why it happens (mechanism)
Additive serotonergic effects
How to manage this interaction
This combination can usually be used together with appropriate oversight from your care team.
- Keep taking both as prescribed unless your doctor or pharmacist tells you otherwise.
- Extra attention is wise when either medicine is started or a dose is changed, since that's when risk is highest. Your team may monitor you more closely during these times.
- Watch for symptoms: agitation, confusion, rapid heartbeat, heavy sweating, tremor, muscle twitching or stiffness, or fever.
- Speak up if these occur; the codeine may be stopped if serotonin syndrome is suspected. Ask your pharmacist before adding any new serotonergic medicine.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
Common questions
Can I take Citalopram and Acetaminophen And Codeine together?
Taking codeine with citalopram slightly raises the theoretical risk of serotonin syndrome, so watch for symptoms like agitation, sweating, fast heartbeat, or muscle twitching, especially when either drug is started or adjusted. Keep taking both as prescribed and contact your care team if these symptoms appear. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Citalopram 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 Citalopram and Acetaminophen And Codeine interaction managed?
This combination can usually be used together with appropriate oversight from your care team. Keep taking both as prescribed unless your doctor or pharmacist tells you otherwise. Extra attention is wise when either medicine is started or a dose is changed, since that's when risk is highest. Your team may monitor you more closely during these times. Watch for symptoms: agitation, confusion, rapid h… 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 Citalopram 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 (3)
- Product Information: Codeine sulfate oral tablets, codeine sulfate oral tablets. West-Ward Pharmaceuticals Corp (per DailyMed), Eatontown, NJ, 2016. DailyMed
- 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 Citalopram
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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