Drug interactions
Histrelin + Siponimod
Severity: Moderate
Histrelin 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
Histrelin, a GnRH agonist, can prolong the QT interval through androgen deprivation. Siponimod may slow heart rate and conduction when started. The combination may raise arrhythmia risk, though the evidence is limited.
What this interaction means in plain words
Histrelin 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.
Histrelin belongs to Musculoskeletal; Siponimod belongs to Central Nervous System.
Why it happens
Additive QT prolongation with siponimod's bradycardic effect.
What to do
Obtain a baseline ECG before starting siponimod in patients on histrelin and consider cardiology advice if other risk factors exist. Keep potassium and magnesium within normal range.
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 Siponimod
- Cladribine + Siponimod Contraindicated
- Fingolimod + Siponimod Contraindicated
- Fluconazole + Siponimod Contraindicated
- Influenza virus vaccine quadrivalent intranasal + Siponimod Contraindicated
- Ponesimod + Siponimod Contraindicated
- Siponimod + Thioridazine Contraindicated
Other interactions of Histrelin
- Amiodarone + Histrelin Major
- Anagrelide + Histrelin Major
- Histrelin + Thioridazine Major
- Alfuzosin + Histrelin Moderate
- Amisulpride + Histrelin Moderate
- Asenapine + Histrelin Moderate
Frequently asked questions
Can I take Histrelin with Siponimod?
MediHelp rates the interaction as moderate. Histrelin 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. Histrelin, a GnRH agonist, can prolong the QT interval through androgen deprivation. Siponimod may slow heart rate and conduction when started. The combination may raise arrhythmia risk, though the evidence is limited.
How serious is the interaction between Histrelin 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: Obtain a baseline ECG before starting siponimod in patients on histrelin and consider cardiology advice if other risk factors exist. Keep potassium and magnesium within normal range.
What other medicines interact with Siponimod?
MediHelp also lists interactions of Siponimod with, for example, Cladribine, Fingolimod, Fluconazole. The full list is on the Siponimod page.
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