What the FDA labels say about taking them together
Levocarnitine and warfarin
Levocarnitine's FDA label of November 4, 2024 names warfarin in its drug interactions section; the warfarin label PlainMeds reads does not name levocarnitine. The levocarnitine label: “Drug Interactions Reports of INR increase with the use of warfarin have been observed.”
Check it at the source: the levocarnitine FDA label on DailyMed (effective November 4, 2024, Leadiant Biosciences, Inc.); the warfarin FDA label on DailyMed (effective May 29, 2026, Amneal Pharmaceuticals LLC).
What does the levocarnitine label say about warfarin?
Levocarnitine label, drug interactionsDrug Interactions Reports of INR increase with the use of warfarin have been observed.
Source: FDA drug label (Carnitor SF), Leadiant Biosciences, Inc., effective November 4, 2024 (SPL set dd904490-83f3-4cd3-bb6f-68e28509b4b6), via openFDA; the full label on DailyMed
What does the warfarin label say about levocarnitine?
Warfarin's label (effective May 29, 2026) does not name levocarnitine 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
| Levocarnitine | Warfarin | |
|---|---|---|
| Labeled for | n/a | Blood clots (DVT and PE), Atrial fibrillation |
| Boxed warning | No | Yes |
| Pharmacy cost (NADAC) | $0.671 per tablet 330 mg tablet | $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