Drug interactions
Hydroxyzine + Pitolisant
Severity: Major
Hydroxyzine and Pitolisant: 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
Pitolisant works by increasing brain histamine release, so a centrally acting H1 antagonist like hydroxyzine may blunt its wake-promoting effect. Both drugs also have QT-prolonging potential, adding an arrhythmic concern.
What this interaction means in plain words
Hydroxyzine and Pitolisant 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.
Hydroxyzine belongs to Respiratory; Pitolisant belongs to Central Nervous System.
Why it happens
Pharmacodynamic antagonism at central H1 receptors, plus additive QT prolongation.
What to do
Avoid concurrent use and choose an alternative to hydroxyzine. If co-use is unavoidable, monitor for loss of pitolisant efficacy and check ECG.
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 Hydroxyzine
- Droperidol + Hydroxyzine Contraindicated
- Hydroxyzine + Pimozide Contraindicated
- Hydroxyzine + Thioridazine Contraindicated
- Hydroxyzine + Vandetanib Contraindicated
- Alfentanil + Hydroxyzine Major
- Amiodarone + Hydroxyzine Major
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 Hydroxyzine with Pitolisant?
MediHelp rates the interaction as major. Hydroxyzine and Pitolisant 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. Pitolisant works by increasing brain histamine release, so a centrally acting H1 antagonist like hydroxyzine may blunt its wake-promoting effect. Both drugs also have QT-prolonging potential, adding an arrhythmic concern.
How serious is the interaction between Hydroxyzine and Pitolisant?
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 choose an alternative to hydroxyzine. If co-use is unavoidable, monitor for loss of pitolisant efficacy and check ECG.
What other medicines interact with Hydroxyzine?
MediHelp also lists interactions of Hydroxyzine with, for example, Droperidol, Pimozide, Thioridazine. The full list is on the Hydroxyzine page.
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