Drug interactions
Diphenoxylate-atropine + Meclizine
Severity: Moderate
Diphenoxylate-atropine 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
Meclizine is an antihistamine with anticholinergic and sedative properties that add to atropine and diphenoxylate effects. This can cause drowsiness, dry mouth, constipation and urinary retention.
What this interaction means in plain words
Diphenoxylate-atropine 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.
Diphenoxylate-atropine belongs to Gastrointestinal Tract; Meclizine belongs to Respiratory.
Why it happens
Additive antimuscarinic and CNS depressant effects.
What to do
Monitor for sedation and anticholinergic effects, especially in older adults, and use the lowest effective doses.
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 Meclizine
Frequently asked questions
Can I take Diphenoxylate-atropine with Meclizine?
MediHelp rates the interaction as moderate. Diphenoxylate-atropine 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. Meclizine is an antihistamine with anticholinergic and sedative properties that add to atropine and diphenoxylate effects. This can cause drowsiness, dry mouth, constipation and urinary retention.
How serious is the interaction between Diphenoxylate-atropine 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: Monitor for sedation and anticholinergic effects, especially in older adults, and use the lowest effective doses.
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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