Drug interactions
Cetirizine + Clomipramine
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.
Overview
Additive CNS depression and psychomotor impairment; may increase dizziness, drowsiness, confusion, and risk of falls. Potential increase in anticholinergic burden (dry mouth, constipation, urinary retention), particularly in older adults.
Mechanism of action
Pharmacodynamic: combined sedative effects from H1-antagonism (cetirizine) and TCA sedating/anticholinergic properties (clomipramine). No meaningful pharmacokinetic interaction expected.
Clinical management
Use the lowest effective doses; avoid or limit alcohol and other CNS depressants; counsel to avoid driving or hazardous tasks until individual response is known; monitor for excessive sedation, confusion, and falls (especially elderly); consider a less sedating antihistamine (e.g., fexofenadine) if sedation occurs.
Drug reference
References
- Clomipramine (Anafranil) Prescribing Information — FDA Label
- Cetirizine Hydrochloride Prescribing Information — FDA Label
- Clomipramine: Drug Information — Lexicomp
- Cetirizine: Drug Information — Lexicomp
Frequently asked questions
Can I take Cetirizine with Clomipramine?
The interaction is rated: Moderate. Additive CNS depression and psychomotor impairment; may increase dizziness, drowsiness, confusion, and risk of falls. Potential increase in anticholinergic burden (dry mouth, constipation, urinary retention), particularly in older adults.
How serious is the interaction between Cetirizine and Clomipramine?
The interaction is rated: Moderate. Evidence level: Moderate.
How is the interaction between Cetirizine and Clomipramine managed?
Use the lowest effective doses; avoid or limit alcohol and other CNS depressants; counsel to avoid driving or hazardous tasks until individual response is known; monitor for excessive sedation, confusion, and falls (especially elderly); consider a less sedating antihistamine (e.g., fexofenadine) if sedation occurs.
Why do Cetirizine and Clomipramine interact?
Pharmacodynamic: combined sedative effects from H1-antagonism (cetirizine) and TCA sedating/anticholinergic properties (clomipramine). No meaningful pharmacokinetic interaction expected.
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