What the FDA labels say about taking them together
Dichlorphenamide and oseltamivir
Dichlorphenamide's FDA label of March 4, 2026 names oseltamivir in its drug interactions section; the oseltamivir label PlainMeds reads does not name dichlorphenamide. The dichlorphenamide label: “Use of KEVEYIS with drugs that are sensitive to OAT1 inhibition is not recommended.”
Check it at the source: the dichlorphenamide FDA label on DailyMed (effective March 4, 2026, Xeris Pharmaceuticals, Inc.); the oseltamivir FDA label on DailyMed (effective December 15, 2025, Genentech, Inc.).
What does the dichlorphenamide label say about oseltamivir?
Dichlorphenamide label, drug interactionsUse of KEVEYIS with drugs that are sensitive to OAT1 inhibition (e.g., methotrexate, famotidine, oseltamivir) is not recommended [see Clinical Pharmacology (12.3) ].
Source: FDA drug label (Keveyis), Xeris Pharmaceuticals, Inc., effective March 4, 2026 (SPL set d30a87b9-90fb-35b2-e053-2995a90aea2c), via openFDA; the full label on DailyMed
What does the oseltamivir label say about dichlorphenamide?
Oseltamivir's label (effective December 15, 2025) does not name dichlorphenamide in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Tamiflu), NDA021087 (Roche), as published by Genentech, Inc., effective December 15, 2025 (SPL set ee3c9555-60f2-4f82-a760-11983c86e97b), 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
| Dichlorphenamide | Oseltamivir | |
|---|---|---|
| Labeled for | n/a | Influenza |
| Boxed warning | No | No |
| Pharmacy cost (NADAC) | n/a | $0.150 per mL 6 mg/mL suspension |
| 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