Drug interactions
Diphenoxylate-atropine + Ziprasidone
Severity: Moderate
Diphenoxylate-atropine and Ziprasidone: 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
Ziprasidone is sedating and has mild anticholinergic activity, so with diphenoxylate-atropine it may increase drowsiness, constipation and urinary retention. Ziprasidone also prolongs the QT interval, and diarrhea-related electrolyte loss may add to arrhythmic risk.
What this interaction means in plain words
Diphenoxylate-atropine and Ziprasidone 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; Ziprasidone belongs to Central Nervous System.
Why it happens
Additive CNS depression and antimuscarinic effects, with QT risk compounded by electrolyte disturbance.
What to do
Monitor sedation and bowel and bladder function, and check potassium and magnesium if diarrhea is significant. Obtain an ECG if other QT risk factors are present.
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 Ziprasidone
- Amiodarone + Ziprasidone Contraindicated
- Amitriptyline + Ziprasidone Contraindicated
- Arsenic trioxide + Ziprasidone Contraindicated
- Bedaquiline + Ziprasidone Contraindicated
- Chloroquine + Ziprasidone Contraindicated
- Citalopram + Ziprasidone Contraindicated
Frequently asked questions
Can I take Diphenoxylate-atropine with Ziprasidone?
MediHelp rates the interaction as moderate. Diphenoxylate-atropine and Ziprasidone 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. Ziprasidone is sedating and has mild anticholinergic activity, so with diphenoxylate-atropine it may increase drowsiness, constipation and urinary retention. Ziprasidone also prolongs the QT interval, and diarrhea-related electrolyte loss may add to arrhythmic risk.
How serious is the interaction between Diphenoxylate-atropine and Ziprasidone?
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 sedation and bowel and bladder function, and check potassium and magnesium if diarrhea is significant. Obtain an ECG if other QT risk factors are present.
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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