What the FDA labels say about taking them together
Dicloxacillin and warfarin
Dicloxacillin's FDA label of December 27, 2023 names warfarin in its drug interactions section; the warfarin label PlainMeds reads does not name dicloxacillin. The dicloxacillin label: “Dicloxacillin may reduce the anticoagulant response to dicumarol and warfarin.”
Check it at the source: the dicloxacillin FDA label on DailyMed (effective December 27, 2023, Aurobindo Pharma Limited); the warfarin FDA label on DailyMed (effective May 29, 2026, Amneal Pharmaceuticals LLC).
What does the dicloxacillin label say about warfarin?
Dicloxacillin label, drug interactionsDicloxacillin may reduce the anticoagulant response to dicumarol and warfarin.
Source: FDA drug label (DICLOXACILLIN SODIUM), Aurobindo Pharma Limited, effective December 27, 2023 (SPL set 9074b5a6-850c-4144-9097-bb21073ee54d), via openFDA; the full label on DailyMed
What does the warfarin label say about dicloxacillin?
Warfarin's label (effective May 29, 2026) does not name dicloxacillin in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Warfarin Sodium), Amneal Pharmaceuticals LLC, effective May 29, 2026 (SPL set 558b7a0d-5490-4c1b-802e-3ab3f1efe760), 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
| Dicloxacillin | Warfarin | |
|---|---|---|
| Labeled for | n/a | Blood clots (DVT and PE), Atrial fibrillation |
| Boxed warning | No | Yes |
| Pharmacy cost (NADAC) | $0.590 per capsule 250 mg capsule | $0.093 per tablet 2 mg tablet |
| 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