Drug interactions
Butabarbital + Siponimod
Severity: Major
Butabarbital and Siponimod: major 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
Butabarbital is an enzyme inducer that can speed up siponimod clearance and lower its exposure, which may reduce its efficacy in multiple sclerosis. The effect is more pronounced in patients with reduced CYP2C9 function.
What this interaction means in plain words
Butabarbital and Siponimod can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Barbiturate induction of CYP3A4 (and CYP2C9) increases siponimod metabolism.
What to do
Avoid the combination in patients with CYP2C9*1/*3 or *2/*3 genotypes and choose a non-inducing sedative or analgesic. In other patients, monitor for loss of disease control if it cannot be avoided.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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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
Frequently asked questions
Can I take Butabarbital with Siponimod?
MediHelp rates the interaction as major. Butabarbital and Siponimod can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Butabarbital is an enzyme inducer that can speed up siponimod clearance and lower its exposure, which may reduce its efficacy in multiple sclerosis. The effect is more pronounced in patients with reduced CYP2C9 function.
How serious is the interaction between Butabarbital and Siponimod?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination in patients with CYP2C9*1/*3 or *2/*3 genotypes and choose a non-inducing sedative or analgesic. In other patients, monitor for loss of disease control if it cannot be avoided.
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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