Drug interactions
Amitriptyline + Selpercatinib
Severity: Major
Amitriptyline and Selpercatinib: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Both drugs can prolong the QT interval, so combining them may increase the risk of ventricular arrhythmias including Torsades de Pointes. The risk is greater with electrolyte disturbances or underlying heart disease.
What this interaction means in plain words
Amitriptyline and Selpercatinib can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Amitriptyline belongs to Central Nervous System; Selpercatinib belongs to Oncology.
Why it happens
Additive QTc prolongation through pharmacodynamic effects on cardiac repolarization.
What to do
Monitor ECG and electrolytes at baseline and periodically, correcting potassium and magnesium abnormalities. Choose an alternative antidepressant if QTc rises significantly.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Amitriptyline
- Amitriptyline + Isocarboxazid Contraindicated
- Amitriptyline + Methylene blue Contraindicated
- Amitriptyline + Phenelzine Contraindicated
- Amitriptyline + Pimozide Contraindicated
- Amitriptyline + Procarbazine Contraindicated
- Amitriptyline + Safinamide Contraindicated
Other interactions of Selpercatinib
Frequently asked questions
Can I take Amitriptyline with Selpercatinib?
MediHelp rates the interaction as major. Amitriptyline and Selpercatinib can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Both drugs can prolong the QT interval, so combining them may increase the risk of ventricular arrhythmias including Torsades de Pointes. The risk is greater with electrolyte disturbances or underlying heart disease.
How serious is the interaction between Amitriptyline and Selpercatinib?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor ECG and electrolytes at baseline and periodically, correcting potassium and magnesium abnormalities. Choose an alternative antidepressant if QTc rises significantly.
What other medicines interact with Amitriptyline?
MediHelp also lists interactions of Amitriptyline with, for example, Isocarboxazid, Methylene blue, Phenelzine. The full list is on the Amitriptyline page.
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