Drug interactions
Dimenhydrinate + Diphenoxylate-atropine
Severity: Moderate
Dimenhydrinate and Diphenoxylate-atropine: 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
Dimenhydrinate is a sedating antihistamine with anticholinergic activity. Combined with diphenoxylate-atropine it may cause more drowsiness and anticholinergic effects such as dry mouth, urinary retention and constipation.
What this interaction means in plain words
Dimenhydrinate and Diphenoxylate-atropine 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; Diphenoxylate-atropine belongs to Gastrointestinal Tract.
Why it happens
Additive sedative and anticholinergic effects.
What to do
Counsel patients to avoid driving and monitor for sedation and anticholinergic effects. Use caution in elderly patients or those with urinary retention.
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 Diphenoxylate-atropine
- Diphenoxylate-atropine + Isocarboxazid Contraindicated
- Diphenoxylate-atropine + Phenelzine Contraindicated
- Diphenoxylate-atropine + Tranylcypromine Contraindicated
- Alfentanil + Diphenoxylate-atropine Major
- Alvimopan + Diphenoxylate-atropine Major
- Amitriptyline + Diphenoxylate-atropine Major
Other interactions of Dimenhydrinate
Frequently asked questions
Can I take Dimenhydrinate with Diphenoxylate-atropine?
MediHelp rates the interaction as moderate. Dimenhydrinate and Diphenoxylate-atropine 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 is a sedating antihistamine with anticholinergic activity. Combined with diphenoxylate-atropine it may cause more drowsiness and anticholinergic effects such as dry mouth, urinary retention and constipation.
How serious is the interaction between Dimenhydrinate and Diphenoxylate-atropine?
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 to avoid driving and monitor for sedation and anticholinergic effects. Use caution in elderly patients or those with urinary retention.
What other medicines interact with Diphenoxylate-atropine?
MediHelp also lists interactions of Diphenoxylate-atropine with, for example, Isocarboxazid, Phenelzine, Tranylcypromine. The full list is on the Diphenoxylate-atropine page.
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