Drug interactions
Dexchlorpheniramine + Dimenhydrinate
Severity: Moderate
Dexchlorpheniramine and Dimenhydrinate: 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 first-generation antihistamines, so concurrent use duplicates therapy and increases sedation and anticholinergic effects. This may cause marked drowsiness, dry mouth, urinary retention and confusion, particularly in older patients.
What this interaction means in plain words
Dexchlorpheniramine and Dimenhydrinate 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.
Dexchlorpheniramine belongs to Respiratory; Dimenhydrinate belongs to Respiratory.
Why it happens
Additive H1 antagonism with additive antimuscarinic and CNS depressant effects.
What to do
Avoid using both together; choose a single antihistamine. Monitor for sedation and anticholinergic effects if overlap 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 Dimenhydrinate
Other interactions of Dexchlorpheniramine
- Alprazolam + Dexchlorpheniramine Moderate
- Amisulpride + Dexchlorpheniramine Moderate
- Amitriptyline + Dexchlorpheniramine Moderate
- Amobarbital + Dexchlorpheniramine Moderate
- Asenapine + Dexchlorpheniramine Moderate
- Azelastine-fluticasone + Dexchlorpheniramine Moderate
Frequently asked questions
Can I take Dexchlorpheniramine with Dimenhydrinate?
MediHelp rates the interaction as moderate. Dexchlorpheniramine and Dimenhydrinate 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 first-generation antihistamines, so concurrent use duplicates therapy and increases sedation and anticholinergic effects. This may cause marked drowsiness, dry mouth, urinary retention and confusion, particularly in older patients.
How serious is the interaction between Dexchlorpheniramine and Dimenhydrinate?
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 using both together; choose a single antihistamine. Monitor for sedation and anticholinergic effects if overlap occurs.
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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