Drug interactions
Nortriptyline + Protriptyline
Severity: Major
Nortriptyline and Protriptyline: 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
Combining two tricyclic antidepressants duplicates therapy and adds QT prolongation, anticholinergic burden, sedation and serotonergic effects. Overdose-type toxicity and seizure risk may increase, and one drug may raise levels of the other.
What this interaction means in plain words
Nortriptyline and Protriptyline 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.
Why it happens
Additive pharmacodynamic effects with competition for CYP2D6 metabolism.
What to do
Avoid concurrent use and consolidate to a single tricyclic; if cross-tapering, monitor ECG and anticholinergic effects.
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 Nortriptyline
- Disopyramide + Nortriptyline Contraindicated
- Dofetilide + Nortriptyline Contraindicated
- Dronedarone + Nortriptyline Contraindicated
- Ibutilide + Nortriptyline Contraindicated
- Isocarboxazid + Nortriptyline Contraindicated
- Methylene blue + Nortriptyline Contraindicated
Frequently asked questions
Can I take Nortriptyline with Protriptyline?
MediHelp rates the interaction as major. Nortriptyline and Protriptyline 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. Combining two tricyclic antidepressants duplicates therapy and adds QT prolongation, anticholinergic burden, sedation and serotonergic effects. Overdose-type toxicity and seizure risk may increase, and one drug may raise levels of the other.
How serious is the interaction between Nortriptyline and Protriptyline?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid concurrent use and consolidate to a single tricyclic; if cross-tapering, monitor ECG and anticholinergic effects.
What other medicines interact with Nortriptyline?
MediHelp also lists interactions of Nortriptyline with, for example, Disopyramide, Dofetilide, Dronedarone. The full list is on the Nortriptyline page.
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