What the FDA labels say about taking them together
Procainamide and siponimod
Siponimod's FDA label of June 30, 2026 names procainamide in its drug interactions section; the procainamide label PlainMeds reads does not name siponimod.
Check it at the source: the procainamide FDA label on DailyMed (effective February 17, 2025, Caplin Steriles Limited); the siponimod FDA label on DailyMed (effective June 30, 2026, Novartis Pharmaceuticals Corporation).
What does the procainamide label say about siponimod?
Procainamide's label (effective February 17, 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 (Procainamide Hydrochloride), Caplin Steriles Limited, effective February 17, 2025 (SPL set fcaa5e9a-3c8a-4796-aa87-626268b6cf60), via openFDA; the full label on DailyMed
What does the siponimod label say about procainamide?
Siponimod label, drug interactionsClass Ia (e.g., quinidine, procainamide) and Class III (e.g., amiodarone, sotalol) antiarrhythmic drugs have been associated with cases of Torsades de Pointes in patients with bradycardia.
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
| Procainamide | Siponimod | |
|---|---|---|
| Labeled for | n/a | 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