Drug interactions
Diazepam intranasal + Levocetirizine
Severity: Moderate
Diazepam intranasal and Levocetirizine: 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
Intranasal diazepam is used for acute seizures and causes marked sedation, which levocetirizine may add to. The combination can deepen drowsiness and impair responsiveness.
What this interaction means in plain words
Diazepam intranasal and Levocetirizine 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.
Why it happens
Additive CNS depression through GABA-A potentiation and H1 antagonism.
What to do
Observe the patient for sedation and breathing after diazepam administration, and avoid additional sedatives where possible.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Diazepam intranasal and Levocetirizine, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
Other interactions of Levocetirizine
Frequently asked questions
Can I take Diazepam intranasal with Levocetirizine?
MediHelp rates the interaction as moderate. Diazepam intranasal and Levocetirizine 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. Intranasal diazepam is used for acute seizures and causes marked sedation, which levocetirizine may add to. The combination can deepen drowsiness and impair responsiveness.
How serious is the interaction between Diazepam intranasal and Levocetirizine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Observe the patient for sedation and breathing after diazepam administration, and avoid additional sedatives where possible.
What other medicines interact with Levocetirizine?
MediHelp also lists interactions of Levocetirizine with, for example, Acrivastine, Asenapine transdermal, Avapritinib. The full list is on the Levocetirizine page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
