Drug interactions
Cenobamate + Chlorpheniramine
Severity: Moderate
Cenobamate and Chlorpheniramine: 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
Cenobamate may induce CYP3A4 and lower chlorpheniramine exposure, possibly reducing its antihistamine effect. Both drugs also cause sedation, so central depressant effects can add together.
What this interaction means in plain words
Cenobamate and Chlorpheniramine 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.
Cenobamate belongs to Central Nervous System; Chlorpheniramine belongs to Respiratory.
Why it happens
Cenobamate induces CYP3A4, which may increase chlorpheniramine metabolism, together with additive CNS depression.
What to do
Monitor for reduced antihistamine efficacy and increase the chlorpheniramine dose only if needed. Counsel the patient about additive drowsiness and dizziness.
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 Chlorpheniramine
Other interactions of Cenobamate
Frequently asked questions
Can I take Cenobamate with Chlorpheniramine?
MediHelp rates the interaction as moderate. Cenobamate and Chlorpheniramine 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. Cenobamate may induce CYP3A4 and lower chlorpheniramine exposure, possibly reducing its antihistamine effect. Both drugs also cause sedation, so central depressant effects can add together.
How serious is the interaction between Cenobamate and Chlorpheniramine?
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 reduced antihistamine efficacy and increase the chlorpheniramine dose only if needed. Counsel the patient about additive drowsiness and dizziness.
What other medicines interact with Chlorpheniramine?
MediHelp also lists interactions of Chlorpheniramine with, for example, Belladonna and opium, Benzhydrocodone / acetaminophen, Brexanolone. The full list is on the Chlorpheniramine page.
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