Drug interactions
Cetirizine + Fentanyl transmucosal
Severity: Moderate
Cetirizine and Fentanyl transmucosal: 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
Transmucosal fentanyl rapidly delivers a potent opioid, and cetirizine may add sedation. The combination increases the chance of oversedation and respiratory depression.
What this interaction means in plain words
Cetirizine and Fentanyl transmucosal 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 and respiratory depression via mu-opioid agonism and H1 blockade.
What to do
Monitor sedation and respiratory rate and use the lowest effective fentanyl dose. Counsel patients to avoid alcohol and other sedatives.
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 Cetirizine
- Acrivastine + Cetirizine Moderate
- Amisulpride + Cetirizine Moderate
- Asenapine + Cetirizine Moderate
- Avapritinib + Cetirizine Moderate
- Benzhydrocodone / acetaminophen + Cetirizine Moderate
- Brexpiprazole + Cetirizine Moderate
Frequently asked questions
Can I take Cetirizine with Fentanyl transmucosal?
MediHelp rates the interaction as moderate. Cetirizine and Fentanyl transmucosal 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. Transmucosal fentanyl rapidly delivers a potent opioid, and cetirizine may add sedation. The combination increases the chance of oversedation and respiratory depression.
How serious is the interaction between Cetirizine and Fentanyl transmucosal?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor sedation and respiratory rate and use the lowest effective fentanyl dose. Counsel patients to avoid alcohol and other sedatives.
What other medicines interact with Cetirizine?
MediHelp also lists interactions of Cetirizine with, for example, Acrivastine, Amisulpride, Asenapine. The full list is on the Cetirizine page.
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