Drug interactions
Cetirizine + Fentanyl transdermal
Severity: Moderate
Cetirizine and Fentanyl transdermal: 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
Transdermal fentanyl provides sustained potent opioid exposure, and cetirizine can add to drowsiness. Combined use may increase the risk of oversedation and respiratory depression.
What this interaction means in plain words
Cetirizine and Fentanyl transdermal 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 for sedation and slowed breathing, especially during dose titration. Avoid alcohol and other depressants 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?
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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 transdermal?
MediHelp rates the interaction as moderate. Cetirizine and Fentanyl transdermal 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. Transdermal fentanyl provides sustained potent opioid exposure, and cetirizine can add to drowsiness. Combined use may increase the risk of oversedation and respiratory depression.
How serious is the interaction between Cetirizine and Fentanyl transdermal?
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 for sedation and slowed breathing, especially during dose titration. Avoid alcohol and other depressants where possible.
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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