Drug interactions
Pitolisant + Trimipramine
Severity: Moderate
Pitolisant and Trimipramine: moderate 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
Pitolisant increases brain histamine, whereas trimipramine is a potent central H1 antagonist, so trimipramine may reduce pitolisant efficacy. Pitolisant is also QT-prolonging and a CYP2D6 substrate, adding further concern.
What this interaction means in plain words
Pitolisant and Trimipramine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Pitolisant belongs to Central Nervous System; Trimipramine belongs to Central Nervous System.
Why it happens
Pharmacodynamic antagonism of histaminergic activity by H1 blockade, with possible additive QT effects.
What to do
Consider an alternative antidepressant with minimal H1 activity if pitolisant response is reduced. Monitor wakefulness and ECG.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Trimipramine
- Disopyramide + Trimipramine Contraindicated
- Dofetilide + Trimipramine Contraindicated
- Ibutilide + Trimipramine Contraindicated
- Isocarboxazid + Trimipramine Contraindicated
- Pentamidine + Trimipramine Contraindicated
- Phenelzine + Trimipramine Contraindicated
Other interactions of Pitolisant
- Alfuzosin + Pitolisant Major
- Amiodarone + Pitolisant Major
- Amisulpride + Pitolisant Major
- Anagrelide + Pitolisant Major
- Asenapine + Pitolisant Major
- Bupropion + Pitolisant Major
Frequently asked questions
Can I take Pitolisant with Trimipramine?
MediHelp rates the interaction as moderate. Pitolisant and Trimipramine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Pitolisant increases brain histamine, whereas trimipramine is a potent central H1 antagonist, so trimipramine may reduce pitolisant efficacy. Pitolisant is also QT-prolonging and a CYP2D6 substrate, adding further concern.
How serious is the interaction between Pitolisant and Trimipramine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Consider an alternative antidepressant with minimal H1 activity if pitolisant response is reduced. Monitor wakefulness and ECG.
What other medicines interact with Trimipramine?
MediHelp also lists interactions of Trimipramine with, for example, Disopyramide, Dofetilide, Ibutilide. The full list is on the Trimipramine page.
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