Drug interactions
Lithium + Loperamide
Severity: Moderate
Lithium and Loperamide: 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
Lithium can cause QT changes and conduction abnormalities, and loperamide at high doses can prolong QT. Combined use may add to arrhythmia risk. Loperamide may also slow gut transit, which could modestly alter lithium absorption.
What this interaction means in plain words
Lithium and Loperamide 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.
Lithium belongs to Central Nervous System; Loperamide belongs to Gastrointestinal Tract.
Why it happens
Additive effects on cardiac repolarization; the mechanism is not firmly established.
What to do
Keep loperamide at labeled doses and monitor ECG in patients with cardiac risk factors. Check serum lithium if diarrhea or dehydration is 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 Loperamide
Other interactions of Lithium
- Lithium + Thioridazine Contraindicated
- Lithium + Vandetanib Contraindicated
- Aceclofenac + Lithium Major
- Acemetacin + Lithium Major
- Amisulpride + Lithium Major
- Amlodipine-benazepril + Lithium Major
Frequently asked questions
Can I take Lithium with Loperamide?
MediHelp rates the interaction as moderate. Lithium and Loperamide 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. Lithium can cause QT changes and conduction abnormalities, and loperamide at high doses can prolong QT. Combined use may add to arrhythmia risk. Loperamide may also slow gut transit, which could modestly alter lithium absorption.
How serious is the interaction between Lithium and Loperamide?
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 at labeled doses and monitor ECG in patients with cardiac risk factors. Check serum lithium if diarrhea or dehydration is present.
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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