What the FDA labels say about taking them together
Alemtuzumab and siponimod
Siponimod's FDA label of June 30, 2026 names alemtuzumab in its drug interactions section; the alemtuzumab label PlainMeds reads does not name siponimod. The siponimod label: “Initiating treatment with MAYZENT after treatment with alemtuzumab is not recommended.”
Check it at the source: the alemtuzumab FDA label on DailyMed (effective November 3, 2025, Genzyme Corporation); the siponimod FDA label on DailyMed (effective June 30, 2026, Novartis Pharmaceuticals Corporation).
What does the alemtuzumab label say about siponimod?
Alemtuzumab's label (effective November 3, 2025) does not name siponimod in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (LEMTRADA), Genzyme Corporation, effective November 3, 2025 (SPL set 6236b0bc-82e9-4447-9a78-f57d94770269), via openFDA; the full label on DailyMed
What does the siponimod label say about alemtuzumab?
Siponimod label, drug interactionsBecause of the characteristics and duration of alemtuzumab immune suppressive effects, initiating treatment with MAYZENT after alemtuzumab is not recommended.
Siponimod label, warnings and precautionsInitiating treatment with MAYZENT after treatment with alemtuzumab is not recommended [see Drug Interactions (7.1)].
Source: FDA drug label (MAYZENT), Novartis Pharmaceuticals Corporation, effective June 30, 2026 (SPL set 44492772-5aed-4627-bd85-e8e89f308bb3), via openFDA; the full label on DailyMed
These are the labels' own sentences. PlainMeds does not grade interactions; a pharmacist or prescriber can say what they mean for one person's medicines.
Both medicines on the record
| Alemtuzumab | Siponimod | |
|---|---|---|
| Labeled for | Multiple sclerosis, Leukemia, lymphoma and myeloma | Multiple sclerosis |
| Boxed warning | Yes | No |
| Pharmacy cost (NADAC) | n/a | n/a |
| Shortage now | No current entry | No current entry |
Source: FDA NDC Directory, CMS NADAC of October 7, 2026 and the FDA Drug Shortage Database (FDA files October 8, 2026)
What next?
- Check more medicines together
- up to five at once