Drug interactions
Dexmedetomidine + Diphenhydramine
Severity: Moderate
Dexmedetomidine 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
Diphenhydramine is strongly sedating and can add to dexmedetomidine sedation, increasing the risk of oversedation and psychomotor impairment. Hypotension or bradycardia may be more pronounced.
What this interaction means in plain words
Dexmedetomidine 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.
Dexmedetomidine belongs to Central Nervous System; Diphenhydramine belongs to Respiratory.
Why it happens
Additive CNS depression through alpha-2 agonism and central H1 antagonism.
What to do
Monitor sedation score and hemodynamics, and reduce the dexmedetomidine dose if excessive sedation occurs.
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 Dexmedetomidine
Other interactions of Diphenhydramine
Frequently asked questions
Can I take Dexmedetomidine with Diphenhydramine?
MediHelp rates the interaction as moderate. Dexmedetomidine 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. Diphenhydramine is strongly sedating and can add to dexmedetomidine sedation, increasing the risk of oversedation and psychomotor impairment. Hypotension or bradycardia may be more pronounced.
How serious is the interaction between Dexmedetomidine 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: Monitor sedation score and hemodynamics, and reduce the dexmedetomidine dose if excessive sedation occurs.
What other medicines interact with Dexmedetomidine?
MediHelp also lists interactions of Dexmedetomidine with, for example, Buprenorphine long-acting, Calcium / magnesium / potassium / sodium oxybates, Dextromoramide. The full list is on the Dexmedetomidine page.
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