Acetaminophen And Codeine and Pixantrone: 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
Pixantrone
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.
What's going on: Pixantrone is a chemotherapy drug that can slow down one of your body's cleanup enzymes (called CYP1A2). The acetaminophen part of your acetaminophen with codeine is partly handled by that same enzyme. So when the two are taken together, more of that medicine could build up in your body than usual.
The good news is this concern is theoretical, meaning it is based on how the drugs work rather than proven problems in people. Your care team can manage it by watching you a little more closely and tailoring your doses. Please don't change anything on your own, just talk with your doctor or pharmacist.
Mechanism: Pixantrone is a CYP1A2 inhibitor. Acetaminophen is metabolized in part by CYP1A2, so co-administration may reduce its clearance and increase systemic exposure (AUC/Cmax).
- Direction: Increased acetaminophen exposure (potential for hepatotoxic NAPQI pathway shifts is theoretical; codeine's CYP2D6 activation is not the primary concern here).
- Evidence: Theoretical; magnitude and onset unspecified.
- Severity on file: Major.
- Management: Use caution with concurrent use; monitor closely. Adhere to acetaminophen dosing limits and watch for signs of accumulation/hepatic stress. Individualize dosing per the care team.
What happens
Increased CYP1A2 substrate exposure
Interaction Deep Dive
Exercise caution when pixantrone, which inhibits CYP1A2, is given together with a CYP1A2 substrate, since this combination may raise the exposure of the CYP1A2 substrate. Should co-administration be necessary, keep the patient under close observation1.
Why it happens (mechanism)
Inhibition of CYP1A2-mediated metabolism by pixantrone
How to manage this interaction
How your team typically handles this:
- Keep taking both medicines exactly as prescribed unless your doctor tells you otherwise.
- Your team may monitor you more closely while you are on both, and your dose may need to be adjusted and individualized by them.
- Be mindful of total daily acetaminophen, including any in over-the-counter products.
What to raise with your pharmacist or prescriber: Tell them you are on both drugs, and report symptoms like unusual tiredness, nausea, belly pain, or yellowing of skin or eyes. Don't start or stop either medicine on your own.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Acetaminophen And Codeine and Pixantrone together?
Pixantrone may slow the breakdown of the acetaminophen in your acetaminophen with codeine, so more can build up. This concern is theoretical, and your care team can manage it by monitoring you and adjusting doses. Keep an eye on your total acetaminophen intake. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Acetaminophen And Codeine and Pixantrone 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 Pixantrone interaction managed?
How your team typically handles this: Keep taking both medicines exactly as prescribed unless your doctor tells you otherwise. Your team may monitor you more closely while you are on both, and your dose may need to be adjusted and individualized by them. Be mindful of total daily acetaminophen, including any in over-the-counter products. What to raise with your pharmacist or prescriber: Tell them… 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 Pixantrone 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: Pixuvri intravenous injection powder concentrate, pixantrone intravenous injection powder concentrate. CTI Life Sciences Limited (per EMA), Hertforshire, United Kingdom, 2012.
Keep reading about Acetaminophen And Codeine
Keep reading about Pixantrone
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