Drug interactions
Cenobamate + Diphenhydramine
Severity: Moderate
Cenobamate and Diphenhydramine: 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 is an antiseizure drug that commonly causes somnolence, dizziness and fatigue. Diphenhydramine adds sedation, so the combination can increase drowsiness and impair coordination and alertness. The risk of falls is higher in older patients.
What this interaction means in plain words
Cenobamate and Diphenhydramine 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; Diphenhydramine belongs to Respiratory.
Why it happens
Additive central nervous system depression from different pharmacological mechanisms.
What to do
Watch for excessive drowsiness and unsteadiness. Choose a non-sedating antihistamine if one is needed, and counsel the patient about driving.
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 Diphenhydramine
Other interactions of Cenobamate
Frequently asked questions
Can I take Cenobamate with Diphenhydramine?
MediHelp rates the interaction as moderate. Cenobamate and Diphenhydramine 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 is an antiseizure drug that commonly causes somnolence, dizziness and fatigue. Diphenhydramine adds sedation, so the combination can increase drowsiness and impair coordination and alertness. The risk of falls is higher in older patients.
How serious is the interaction between Cenobamate and Diphenhydramine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Watch for excessive drowsiness and unsteadiness. Choose a non-sedating antihistamine if one is needed, and counsel the patient about driving.
What other medicines interact with Diphenhydramine?
MediHelp also lists interactions of Diphenhydramine with, for example, Alfentanil, Belladonna and opium, Benzhydrocodone / acetaminophen. The full list is on the Diphenhydramine page.
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