Amitriptyline and Ceritinib: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 2, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Amitriptyline
Ceritinib
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.
Both of your medicines can affect the timing of your heartbeat. Amitriptyline (Elavil) and ceritinib (Zykadia) can each stretch out a part of the heart's electrical cycle called the QT interval. When taken together, that effect can add up, which in rare cases can lead to an abnormal heart rhythm.
The good news is that this is a known, manageable concern. Your care team can check your heart rhythm with an EKG and adjust things if needed. Please don't stop either medicine on your own. Just talk with your pharmacist or doctor so they can keep an eye on your heart and keep you safe.
Effect: Additive QTc prolongation with combined amitriptyline and ceritinib.
Mechanism: Both agents independently prolong the QT interval (ceritinib in a concentration-dependent manner); the effect is pharmacodynamic and additive, not a metabolic interaction. Neither is a prodrug here.
- Direction/magnitude: Increased risk of QTc prolongation; magnitude not quantified.
- Onset: Unspecified.
- Evidence: Theoretical.
- Severity: Major.
Management: Avoid concomitant use where feasible. If used together, monitor ECG and electrolytes (K+, Mg2+). Ceritinib may be withheld, dose-reduced, or discontinued for significant QTc prolongation per clinical judgment.
What happens
An increased risk of QT interval prolongation
Interaction Deep Dive
Do not combine ceritinib, which produces QTc-interval prolongation in a concentration-dependent manner, with another agent that prolongs the QT interval, because the prolonging effects may be additive. When these drugs are given together, ECGs should be monitored. Depending on clinical need, ceritinib should be withheld, dose-reduced, or stopped permanently in response to QTc interval prolongation1.
Why it happens (mechanism)
Additive QT interval prolongation
How to manage this interaction
Keep taking both medicines exactly as prescribed unless your care team tells you otherwise. Because both can affect your heart rhythm, your team will manage this carefully.
- Your doctor may order EKGs to watch your heart rhythm while you take both drugs.
- The ceritinib dose may be adjusted or paused by your team if your EKG shows changes, and they will individualize this for you.
- In some cases they may choose an alternative medicine to avoid combining two QT-prolonging drugs.
- Tell your prescriber or pharmacist about any fainting, dizziness, or a racing or irregular heartbeat right away.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Amitriptyline and Ceritinib together?
Taking amitriptyline and ceritinib together can add up to prolong the QT interval and raise the risk of an abnormal heart rhythm; your care team can manage this with EKG monitoring and dose adjustments, so keep taking both as prescribed and check with your doctor or pharmacist. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Amitriptyline and Ceritinib 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 Amitriptyline and Ceritinib interaction managed?
Keep taking both medicines exactly as prescribed unless your care team tells you otherwise. Because both can affect your heart rhythm, your team will manage this carefully. Your doctor may order EKGs to watch your heart rhythm while you take both drugs. The ceritinib dose may be adjusted or paused by your team if your EKG shows changes, and they will individualize this for you. In some cases they… 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 Amitriptyline or Ceritinib 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: ZYKADIA(R) oral capsules, oral tablets, ceritinib oral capsules, oral tablets. Novartis Pharmaceuticals Corporation (per FDA), East Hanover, NJ, 2019. DailyMed
Keep reading about Amitriptyline
Keep reading about Ceritinib
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