Eslicarbazepine Acetate and Amitriptyline: 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
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.
You've been prescribed amitriptyline (Elavil) and eslicarbazepine (Aptiom) together. Amitriptyline is partly broken down by a liver enzyme called CYP2C19. Eslicarbazepine can slow that enzyme down, so your body may clear amitriptyline a little slower, and the level in your blood may rise.
If that happens, you might notice more of amitriptyline's usual effects, like drowsiness, dry mouth, constipation, dizziness, or a faster heartbeat. The good news is this concern is based on theory, not on strong real-world data. Please keep taking both as prescribed and let your doctor or pharmacist know how you're feeling. Your care team can tailor the dose and keep an eye on you.
Effect: Eslicarbazepine acetate is a CYP2C19 inhibitor and may reduce metabolism of amitriptyline (a partial CYP2C19 substrate), increasing amitriptyline exposure (AUC/Cmax) and its active metabolite nortriptyline.
- Direction: Increased TCA exposure, greater risk of anticholinergic effects, sedation, orthostasis, and QT/conduction effects.
- Mechanism: Inhibition of CYP2C19-mediated metabolism.
- Evidence: Theoretical; magnitude and onset unspecified.
- Severity on file: Major.
Management: Use caution and monitor closely. Assess for TCA toxicity, consider ECG in at-risk patients, and individualize amitriptyline dosing. Plasma TCA level monitoring may help guide adjustment.
What happens
Increased exposure of CYP2C19 substrates
Interaction Deep Dive
Giving eslicarbazepine acetate, which inhibits CYP2C19, together with a substrate of CYP2C19 can raise the exposure of that CYP2C19 substrate1. When these agents are used together, exercise caution and keep the patient under close observation.
Why it happens (mechanism)
Inhibition of CYP2C19-mediated metabolism by eslicarbazepine acetate
How to manage this interaction
Both drugs can be used together, but your care team will watch you more closely because amitriptyline levels may rise.
- Keep taking both exactly as prescribed unless your doctor tells you otherwise.
- Your amitriptyline dose may need to be adjusted and individualized by your care team.
- Watch for increased side effects: strong drowsiness, dry mouth, constipation, blurred vision, dizziness on standing, or a racing/irregular heartbeat.
- Tell your pharmacist or prescriber about any new or worsening symptoms.
Your team may monitor you more closely, and in some cases check amitriptyline blood levels or an ECG to keep things safe.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Eslicarbazepine Acetate and Amitriptyline together?
Eslicarbazepine may raise amitriptyline levels by slowing its breakdown, so watch for extra side effects and stay in touch with your care team, who can adjust the dose and monitor you. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Eslicarbazepine Acetate and Amitriptyline 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 Amitriptyline interaction managed?
Both drugs can be used together, but your care team will watch you more closely because amitriptyline levels may rise. Keep taking both exactly as prescribed unless your doctor tells you otherwise. Your amitriptyline dose may need to be adjusted and individualized by your care team. Watch for increased side effects: strong drowsiness, dry mouth, constipation, blurred vision, dizziness on standing,… 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 Eslicarbazepine Acetate or Amitriptyline 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: APTIOM(R) oral tablets, eslicarbazepine acetate oral tablets. Sunovion Pharmaceuticals Inc (per manufacturer), Marlborough, MA, 2017. DailyMed
Keep reading about Amitriptyline
Keep reading about Eslicarbazepine Acetate
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