Drug interactions
Pentobarbital + Siponimod
Severity: Moderate
Pentobarbital 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
Pentobarbital induces CYP3A4 and may lower siponimod concentrations and its efficacy. The effect is larger in patients with reduced CYP2C9 activity.
What this interaction means in plain words
Pentobarbital 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.
Why it happens
Enzyme induction of CYP3A4 (and CYP2C9) increases siponimod metabolism.
What to do
Avoid in patients with CYP2C9*1/*3 or *2/*3 genotypes. In others, monitor for reduced disease control and consider alternative sedation.
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
Frequently asked questions
Can I take Pentobarbital with Siponimod?
MediHelp rates the interaction as moderate. Pentobarbital 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. Pentobarbital induces CYP3A4 and may lower siponimod concentrations and its efficacy. The effect is larger in patients with reduced CYP2C9 activity.
How serious is the interaction between Pentobarbital 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 in patients with CYP2C9*1/*3 or *2/*3 genotypes. In others, monitor for reduced disease control and consider alternative sedation.
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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