Amitriptyline and Triclabendazole: 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
Triclabendazole
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.
You've been prescribed triclabendazole (a short course medicine for a parasite infection) while you're also taking amitriptyline. Both of these can affect your heart's electrical rhythm in a way doctors call QT prolongation. When two medicines that do this are used together, the effect can add up and, in rare cases, lead to an irregular heartbeat.
The good news is that triclabendazole is usually given for just a day or two, and your care team can manage this. They may check your heart rhythm with an ECG. Don't stop either medicine on your own. Just let your pharmacist or doctor know you take both so they can keep an eye on things.
Effect: Additive QT-interval prolongation when triclabendazole is co-administered with amitriptyline, a known QT-prolonging tricyclic antidepressant.
- Mechanism: Pharmacodynamic (additive), not metabolic. Both agents prolong ventricular repolarization; risk of QTc prolongation and torsades de pointes.
- Direction/magnitude: Increased combined QT effect; triclabendazole's QTc effect may grow with longer treatment duration.
- Onset: Unspecified; evidence: theoretical.
- Management: Obtain baseline and follow-up ECG. Correct electrolytes (K+, Mg2+). Discontinue if arrhythmia or significant QTc prolongation occurs. Weigh against other QT-prolonging drugs and bradycardia.
What happens
An increased risk of QT interval prolongation
Interaction Deep Dive
Taking triclabendazole together with this medication can produce additive prolongation of the QT interval. When triclabendazole is combined with an agent that prolongs QT, ECG monitoring is advised, and therapy should be stopped if indications of cardiac arrhythmias appear. Triclabendazole itself lengthens the QT interval, and the degree of QTc prolongation may grow as the duration of treatment increases1.
Why it happens (mechanism)
Additive QT interval prolongation
How to manage this interaction
This interaction is manageable, and triclabendazole is typically a very short course.
- Keep taking both as prescribed unless your care team tells you otherwise.
- Your team may check your heart rhythm with an ECG while you take both, especially if treatment is longer.
- They may also check your potassium and magnesium levels, since these affect heart rhythm.
- Tell your prescriber about any other medicines you take that affect the heart.
- Seek prompt care for fainting, palpitations, dizziness, or an irregular heartbeat; treatment would be stopped if a rhythm problem appears.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Amitriptyline and Triclabendazole together?
Both drugs can prolong the QT interval, so together they may raise the risk of an abnormal heart rhythm; keep taking them as prescribed but let your care team monitor your heart rhythm, especially since triclabendazole is only a short course. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Amitriptyline and Triclabendazole 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 Triclabendazole interaction managed?
This interaction is manageable, and triclabendazole is typically a very short course. Keep taking both as prescribed unless your care team tells you otherwise. Your team may check your heart rhythm with an ECG while you take both, especially if treatment is longer. They may also check your potassium and magnesium levels, since these affect heart rhythm. Tell your prescriber about any other medicin… 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 Triclabendazole 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: EGATEN(R) oral tablets, triclabendazole oral tablets. Novartis Pharmaceuticals Corporation (per FDA), East Hanover, NJ, 2022. DailyMed
Keep reading about Amitriptyline
Keep reading about Triclabendazole
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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