Drug interactions
Diphenhydramine + Moxonidine
Severity: Moderate
Diphenhydramine and Moxonidine: 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
Moxonidine, a centrally acting antihypertensive, can cause drowsiness and dizziness, and diphenhydramine may add to sedation. Blood pressure lowering may also contribute to dizziness.
What this interaction means in plain words
Diphenhydramine and Moxonidine 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 depression and sedation.
What to do
Counsel patients about drowsiness and orthostatic dizziness and caution about driving. Use a non-sedating antihistamine if needed.
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
Frequently asked questions
Can I take Diphenhydramine with Moxonidine?
MediHelp rates the interaction as moderate. Diphenhydramine and Moxonidine 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. Moxonidine, a centrally acting antihypertensive, can cause drowsiness and dizziness, and diphenhydramine may add to sedation. Blood pressure lowering may also contribute to dizziness.
How serious is the interaction between Diphenhydramine and Moxonidine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Counsel patients about drowsiness and orthostatic dizziness and caution about driving. Use a non-sedating antihistamine if needed.
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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