Amitriptyline and Asenapine: 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
Asenapine
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 these medicines can affect your heart's rhythm. Amitriptyline (Elavil) and asenapine (Saphris, Secuado) each can slightly stretch out a part of the heartbeat called the QT interval. When they are taken together, those effects can add up, which in rare cases could lead to an irregular heartbeat.
This is based mainly on how the drugs work rather than lots of real-world reports, so try not to worry. Tell your care team you take both, and mention any dizziness, fainting, or a fluttering heartbeat. Your doctor and pharmacist can manage this safely, often just by keeping an eye on your heart.
Effect: Additive QT interval prolongation with combined amitriptyline (TCA) and asenapine (atypical antipsychotic). This is a pharmacodynamic interaction; neither agent's metabolism drives the risk.
- Direction: Additive delayed cardiac repolarization, increasing torsades de pointes risk.
- Evidence: Theoretical; magnitude not quantified.
- Onset: Unspecified.
- Management: Manufacturer advises avoiding coadministration. If used together, obtain baseline and follow-up ECGs, monitor and correct electrolytes (K+, Mg2+), and review other QT-prolonging agents and bradycardia. Individualize dosing per the care team.
What happens
Increased risk of QT interval prolongation
Interaction Deep Dive
Because of the risk of cumulative QT interval effects, asenapine should not be given together with medications known to prolong the QT interval123.
Why it happens (mechanism)
Additive QT interval prolongation
How to manage this interaction
Keep taking both medicines as prescribed unless your prescriber tells you otherwise. The concern is that both can add to QT prolongation, so your care team leads the plan here.
- Product labeling advises avoiding this combination, so your team may consider an alternative or decide monitoring is appropriate for you.
- They may check an ECG and blood electrolytes (like potassium and magnesium) before and during treatment.
- Any dose may be adjusted and individualized by your care team.
- Call your pharmacist or doctor about fainting, palpitations, or a racing or irregular heartbeat, and ask before adding other medicines.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) In an electrocardiographic investigation involving 151 clinically stable patients, giving asenapine at doses of 5 mg, 10 mg, 15 mg, and 20 mg twice daily produced QTc interval prolongations of 2 to 5 milliseconds relative to placebo. No patient had a QTc interval reaching 500 milliseconds or more, nor a QTc rise of 60 milliseconds or more from baseline values 123.
Common questions
Can I take Amitriptyline and Asenapine together?
Combining amitriptyline and asenapine can add up to prolong the QT interval, and labeling advises avoiding the pair; keep taking both as prescribed and ask your prescriber or pharmacist whether an alternative or heart monitoring is right for you. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Amitriptyline and Asenapine 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 Asenapine interaction managed?
Keep taking both medicines as prescribed unless your prescriber tells you otherwise. The concern is that both can add to QT prolongation, so your care team leads the plan here. Product labeling advises avoiding this combination, so your team may consider an alternative or decide monitoring is appropriate for you. They may check an ECG and blood electrolytes (like potassium and magnesium) before an… 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 Asenapine 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: SAPHRIS(R) oral sublingual tablets, asenapine oral sublingual tablets. Allergan USA, Inc. (per DailyMed), Madison, NJ, 2021. DailyMed
- Product Information: SECUADO® transdermal system, asenapine transdermal system. Noven Therapeutics LLC (per DailyMed), Miami, FL, 2023. DailyMed
- Product Information: Asenapine oral sublingual tablets, asenapine oral sublingual tablets. Alembic Pharmaceuticals Ltd (per DailyMed), Bedminster, NJ, 2025. DailyMed
Keep reading about Amitriptyline
Keep reading about Asenapine
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