Drug interactions
Siponimod + Timolol
Severity: Moderate
Siponimod and Timolol: 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 causes transient heart rate reduction and atrioventricular conduction delay on initiation. Beta-blockers add to this bradycardic effect, increasing risk of symptomatic bradycardia.
What this interaction means in plain words
Siponimod and Timolol 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 belongs to Central Nervous System; Timolol belongs to Cardiovascular.
Why it happens
Additive negative chronotropic effects from S1P receptor modulation and beta-blockade.
What to do
Use caution when starting siponimod in patients on timolol and consider temporarily interrupting the beta-blocker with cardiology input. Beta-blockers can be started in patients on stable siponimod.
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 Timolol
- Acebutolol + Timolol Major
- Albuterol + Timolol Major
- Aldesleukin + Timolol Major
- Amifostine + Timolol Major
- Amiodarone + Timolol Major
- Arformoterol + Timolol Major
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 Siponimod with Timolol?
MediHelp rates the interaction as moderate. Siponimod and Timolol 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 causes transient heart rate reduction and atrioventricular conduction delay on initiation. Beta-blockers add to this bradycardic effect, increasing risk of symptomatic bradycardia.
How serious is the interaction between Siponimod and Timolol?
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 caution when starting siponimod in patients on timolol and consider temporarily interrupting the beta-blocker with cardiology input. Beta-blockers can be started in patients on stable siponimod.
What other medicines interact with Timolol?
MediHelp also lists interactions of Timolol with, for example, Acebutolol, Albuterol, Aldesleukin. The full list is on the Timolol page.
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