Drug interactions
Dimenhydrinate + Homatropine
Severity: Moderate
Dimenhydrinate and Homatropine: 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
Homatropine is an antimuscarinic, often found in cough preparations, and dimenhydrinate adds further anticholinergic and sedative effects. This may cause dry mouth, constipation, urinary retention, blurred vision and confusion.
What this interaction means in plain words
Dimenhydrinate and Homatropine 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; Homatropine belongs to Genitourinary.
Why it happens
Additive antimuscarinic effects.
What to do
Monitor for anticholinergic effects, especially in older adults, and avoid duplicate anticholinergic therapy where an alternative exists.
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 Homatropine
- Amantadine + Homatropine Moderate
- Amitriptyline + Homatropine Moderate
- Atropine + Homatropine Moderate
- Benztropine + Homatropine Moderate
- Bethanechol + Homatropine Moderate
- Chlorpromazine + Homatropine Moderate
Frequently asked questions
Can I take Dimenhydrinate with Homatropine?
MediHelp rates the interaction as moderate. Dimenhydrinate and Homatropine 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. Homatropine is an antimuscarinic, often found in cough preparations, and dimenhydrinate adds further anticholinergic and sedative effects. This may cause dry mouth, constipation, urinary retention, blurred vision and confusion.
How serious is the interaction between Dimenhydrinate and Homatropine?
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 for anticholinergic effects, especially in older adults, and avoid duplicate anticholinergic therapy where an alternative exists.
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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