Drug interactions
Loperamide + Olanzapine
Severity: Moderate
Loperamide and Olanzapine: 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
Olanzapine has a small QT effect, and loperamide at high doses can prolong QT. Together they could add to arrhythmia risk, and both may reduce gut motility.
What this interaction means in plain words
Loperamide and Olanzapine 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.
Loperamide belongs to Gastrointestinal Tract; Olanzapine belongs to Central Nervous System.
Why it happens
Additive QT prolongation; additive antimotility effects.
What to do
Keep loperamide within labeled doses and check an ECG if other QT risk factors exist. Monitor for constipation or ileus.
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 Loperamide
Other interactions of Olanzapine
Frequently asked questions
Can I take Loperamide with Olanzapine?
MediHelp rates the interaction as moderate. Loperamide and Olanzapine 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. Olanzapine has a small QT effect, and loperamide at high doses can prolong QT. Together they could add to arrhythmia risk, and both may reduce gut motility.
How serious is the interaction between Loperamide and Olanzapine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Keep loperamide within labeled doses and check an ECG if other QT risk factors exist. Monitor for constipation or ileus.
What other medicines interact with Loperamide?
MediHelp also lists interactions of Loperamide with, for example, Amiodarone, Amisulpride, Anagrelide. The full list is on the Loperamide page.
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