Drug interactions
Loperamide + Mirtazapine
Severity: Moderate
Loperamide and Mirtazapine: 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
Mirtazapine has a modest QT-prolonging effect, mainly in overdose or with other risk factors, and high-dose loperamide can also prolong QT. Combined use may add to arrhythmia risk.
What this interaction means in plain words
Loperamide and Mirtazapine 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; Mirtazapine belongs to Central Nervous System.
Why it happens
Additive QT prolongation via cardiac ion channel effects.
What to do
Use labeled loperamide doses only and avoid additional QT-prolonging agents. Check an ECG and electrolytes in patients with heart disease or electrolyte disturbance.
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 Mirtazapine
- Isocarboxazid + Mirtazapine Contraindicated
- Mirtazapine + Phenelzine Contraindicated
- Mirtazapine + Pimozide Contraindicated
- Mirtazapine + Procarbazine Contraindicated
- Mirtazapine + Rasagiline Contraindicated
- Mirtazapine + Selegiline Contraindicated
Frequently asked questions
Can I take Loperamide with Mirtazapine?
MediHelp rates the interaction as moderate. Loperamide and Mirtazapine 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. Mirtazapine has a modest QT-prolonging effect, mainly in overdose or with other risk factors, and high-dose loperamide can also prolong QT. Combined use may add to arrhythmia risk.
How serious is the interaction between Loperamide and Mirtazapine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use labeled loperamide doses only and avoid additional QT-prolonging agents. Check an ECG and electrolytes in patients with heart disease or electrolyte disturbance.
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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