Drug interactions
Pembrolizumab + Siponimod
Severity: Moderate
Pembrolizumab 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
Pembrolizumab is a PD-1 checkpoint inhibitor that enhances immune activity and may cause immune-related adverse events, while siponimod sequesters lymphocytes. The net effect is unpredictable, and corticosteroids used for immune toxicity add infection risk.
What this interaction means in plain words
Pembrolizumab 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.
Pembrolizumab belongs to Oncology; Siponimod belongs to Central Nervous System.
Why it happens
Pharmacodynamic: opposing immune effects of S1P modulation and PD-1 blockade with unpredictable net result.
What to do
Weigh the need for both agents, and monitor lymphocyte counts and for infection and immune-related adverse events if combined.
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 Pembrolizumab
Frequently asked questions
Can I take Pembrolizumab with Siponimod?
MediHelp rates the interaction as moderate. Pembrolizumab 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. Pembrolizumab is a PD-1 checkpoint inhibitor that enhances immune activity and may cause immune-related adverse events, while siponimod sequesters lymphocytes. The net effect is unpredictable, and corticosteroids used for immune toxicity add infection risk.
How serious is the interaction between Pembrolizumab 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: Weigh the need for both agents, and monitor lymphocyte counts and for infection and immune-related adverse events if combined.
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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