Drug interactions
Bexarotene + Siponimod
Severity: Moderate
Bexarotene 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
Bexarotene is a CYP3A4 inducer and may lower siponimod concentrations. The effect is greater in patients with reduced CYP2C9 activity, as CYP3A4 then plays a larger role in siponimod clearance, and it may reduce efficacy.
What this interaction means in plain words
Bexarotene 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.
Bexarotene belongs to Oncology; Siponimod belongs to Central Nervous System.
Why it happens
CYP3A4 induction increases siponimod metabolism and lowers its exposure.
What to do
Avoid siponimod with a moderate or strong CYP3A4 inducer in patients with CYP2C9*1/*3 or *2/*3 genotypes, or when a CYP2C9 inhibitor is also given. Otherwise monitor for loss of efficacy and consider an alternative therapy.
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 Bexarotene
- Bexarotene + Gemfibrozil Major
- Bexarotene + Lorlatinib Major
- Alogliptin-pioglitazone + Bexarotene Moderate
- Amobarbital + Bexarotene Moderate
- Aprepitant + Bexarotene Moderate
- Axitinib + Bexarotene Moderate
Frequently asked questions
Can I take Bexarotene with Siponimod?
MediHelp rates the interaction as moderate. Bexarotene 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. Bexarotene is a CYP3A4 inducer and may lower siponimod concentrations. The effect is greater in patients with reduced CYP2C9 activity, as CYP3A4 then plays a larger role in siponimod clearance, and it may reduce efficacy.
How serious is the interaction between Bexarotene 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 siponimod with a moderate or strong CYP3A4 inducer in patients with CYP2C9*1/*3 or *2/*3 genotypes, or when a CYP2C9 inhibitor is also given. Otherwise monitor for loss of efficacy and consider an alternative therapy.
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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