Drug interactions
Lofepramine + Nortriptyline
Severity: Major
Lofepramine and Nortriptyline: major interaction.
Last updated Sources: US FDA label
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
Lofepramine is a tricyclic that is metabolized to desipramine, so using it with nortriptyline is therapeutic duplication. It adds to QT prolongation, anticholinergic burden, sedation and serotonergic effects, and increases toxicity risk.
What this interaction means in plain words
Lofepramine and Nortriptyline 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
Duplicate tricyclic pharmacology with additive QT prolongation, anticholinergic and serotonergic effects.
What to do
Avoid using two tricyclic antidepressants together. Use a single agent and optimize its dose.
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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References
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 Lofepramine with Nortriptyline?
MediHelp rates the interaction as major. Lofepramine and Nortriptyline 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. Lofepramine is a tricyclic that is metabolized to desipramine, so using it with nortriptyline is therapeutic duplication. It adds to QT prolongation, anticholinergic burden, sedation and serotonergic effects, and increases toxicity risk.
How serious is the interaction between Lofepramine and Nortriptyline?
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 using two tricyclic antidepressants together. Use a single agent and optimize its dose.
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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