Drug interactions
Loperamide + Siponimod
Severity: Moderate
Loperamide and Siponimod: 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
Siponimod can cause bradycardia and conduction delay at initiation, and high-dose loperamide can prolong QT and cause arrhythmia. Combined use could increase cardiac risk.
What this interaction means in plain words
Loperamide and Siponimod 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; Siponimod belongs to Central Nervous System.
Why it happens
Additive cardiac effects: S1P-mediated heart rate slowing with loperamide-related QT prolongation.
What to do
Avoid high-dose loperamide, especially during siponimod initiation. Obtain an ECG in patients with cardiac 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 Siponimod
- Cladribine + Siponimod Contraindicated
- Fingolimod + Siponimod Contraindicated
- Fluconazole + Siponimod Contraindicated
- Influenza virus vaccine quadrivalent intranasal + Siponimod Contraindicated
- Ponesimod + Siponimod Contraindicated
- Siponimod + Thioridazine Contraindicated
Frequently asked questions
Can I take Loperamide with Siponimod?
MediHelp rates the interaction as moderate. Loperamide and Siponimod 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. Siponimod can cause bradycardia and conduction delay at initiation, and high-dose loperamide can prolong QT and cause arrhythmia. Combined use could increase cardiac risk.
How serious is the interaction between Loperamide and Siponimod?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid high-dose loperamide, especially during siponimod initiation. Obtain an ECG in patients with cardiac 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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