Drug interactions
Loperamide + Valbenazine
Severity: Moderate
Loperamide and Valbenazine: 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
Valbenazine can prolong the QT interval at higher exposures, and loperamide at high doses also prolongs QT. Together the arrhythmia risk may rise, particularly with electrolyte disturbances or other risk factors.
What this interaction means in plain words
Loperamide and Valbenazine 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; Valbenazine belongs to Central Nervous System.
Why it happens
Additive QT interval prolongation.
What to do
Keep loperamide at labeled doses and correct electrolytes; consider ECG monitoring in patients with other QT risk factors.
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 Valbenazine
- Deutetrabenazine + Valbenazine Contraindicated
- Tranylcypromine + Valbenazine Contraindicated
- Amiodarone + Valbenazine Major
- Amisulpride + Valbenazine Major
- Apalutamide + Valbenazine Major
- Carbamazepine + Valbenazine Major
Frequently asked questions
Can I take Loperamide with Valbenazine?
MediHelp rates the interaction as moderate. Loperamide and Valbenazine 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. Valbenazine can prolong the QT interval at higher exposures, and loperamide at high doses also prolongs QT. Together the arrhythmia risk may rise, particularly with electrolyte disturbances or other risk factors.
How serious is the interaction between Loperamide and Valbenazine?
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 correct electrolytes; consider ECG monitoring in patients with other QT risk factors.
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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