What the FDA labels say about taking them together
Chloramphenicol and methotrexate
Methotrexate's FDA label (Rasuvo) of December 15, 2025 names chloramphenicol in its drug interactions section; the chloramphenicol label PlainMeds reads does not name methotrexate. The methotrexate label: “Oral antibiotics such as tetracycline, chloramphenicol, and nonabsorbable broad spectrum antibiotics, may decrease intestinal absorption of methotrexate or interfere with the enterohepatic circulation by inhibiting …”
Check it at the source: the chloramphenicol FDA label on DailyMed (effective October 10, 2024, Fresenius Kabi USA, LLC); the methotrexate FDA label on DailyMed (effective May 27, 2026, Accord Healthcare Inc.).
What does the chloramphenicol label say about methotrexate?
Chloramphenicol's label (effective October 10, 2024) does not name methotrexate in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Chloramphenicol Sodium Succinate), Fresenius Kabi USA, LLC, effective October 10, 2024 (SPL set aed29594-211d-49ef-813f-131975a8d0e3), via openFDA; the full label on DailyMed
What does the methotrexate label say about chloramphenicol?
Rasuvo label (Medexus Pharma Inc., December 15, 2025), drug interactionsOral antibiotics such as tetracycline, chloramphenicol, and nonabsorbable broad spectrum antibiotics, may decrease intestinal absorption of methotrexate or interfere with the enterohepatic circulation by inhibiting bowel flora and suppressing metabolism of the drug by bacteria.
Source: FDA drug label (Rasuvo, NDA205776), Medexus Pharma Inc., effective December 15, 2025 (SPL set d0075461-0e7e-4967-9c9b-d6440e912c0e), via openFDA
Source: FDA drug label (Methotrexate), Accord Healthcare Inc., effective May 27, 2026 (SPL set 874c7f43-a3be-4236-89cc-24c44e3c5813), 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
| Chloramphenicol | Methotrexate | |
|---|---|---|
| Labeled for | n/a | Rheumatoid arthritis, Psoriasis, Leukemia, lymphoma and myeloma, Breast cancer |
| Boxed warning | Yes | Yes |
| Pharmacy cost (NADAC) | n/a | $0.158 per tablet 2.5 mg tablet |
| Shortage now | No current entry | In shortage |
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