Drug interactions
Dimenhydrinate + Meclizine
Severity: Moderate
Dimenhydrinate and Meclizine: 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
Both are sedating first-generation antihistamines with anticholinergic activity, and dimenhydrinate is partly diphenhydramine. Using them together duplicates therapy and adds drowsiness, dry mouth, blurred vision, urinary retention and confusion, especially in older adults.
What this interaction means in plain words
Dimenhydrinate and Meclizine 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.
Dimenhydrinate belongs to Respiratory; Meclizine belongs to Respiratory.
Why it happens
Additive H1-antihistamine and muscarinic receptor blockade producing duplicated anticholinergic and sedative effects.
What to do
Avoid combining the two; use a single agent at the lowest effective dose. Counsel on sedation and avoid driving if both have been taken.
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 Dimenhydrinate
Other interactions of Meclizine
Frequently asked questions
Can I take Dimenhydrinate with Meclizine?
MediHelp rates the interaction as moderate. Dimenhydrinate and Meclizine 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. Both are sedating first-generation antihistamines with anticholinergic activity, and dimenhydrinate is partly diphenhydramine. Using them together duplicates therapy and adds drowsiness, dry mouth, blurred vision, urinary retention and confusion, especially in older adults.
How serious is the interaction between Dimenhydrinate and Meclizine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid combining the two; use a single agent at the lowest effective dose. Counsel on sedation and avoid driving if both have been taken.
What other medicines interact with Dimenhydrinate?
MediHelp also lists interactions of Dimenhydrinate with, for example, Belladonna and opium, Brexanolone, Calcium / magnesium / potassium / sodium oxybates. The full list is on the Dimenhydrinate page.
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