What the FDA labels say about taking them together
Eltrombopag and sulfasalazine
Eltrombopag's FDA label of December 18, 2025 names sulfasalazine in its drug interactions section; the sulfasalazine label PlainMeds reads does not name eltrombopag.
Check it at the source: the eltrombopag FDA label on DailyMed (effective December 18, 2025, Novartis Pharmaceuticals Corporation); the sulfasalazine FDA label on DailyMed (effective May 29, 2026, Pfizer Laboratories Div Pfizer Inc).
What does the eltrombopag label say about sulfasalazine?
Eltrombopag label, drug interactionsUse caution when concomitantly administering PROMACTA and drugs that are substrates of OATP1B1 (e.g., atorvastatin, bosentan, ezetimibe, fluvastatin, glyburide, olmesartan, pitavastatin, pravastatin, rosuvastatin, repaglinide, rifampin, simvastatin acid, SN-38 [active metabolite of irinotecan], valsartan) or breast cancer resistance protein (BCRP) (e.g., imatinib, irinotecan, lapatinib, methotrexate, mitoxantrone, rosuvastatin, sulfasalazine, topotecan).
Source: FDA drug label (Alvaiz, NDA216774), Teva Pharmaceuticals, Inc., effective January 1, 2026 (SPL set ed51e463-7a03-4858-bbd2-882ce4753d5a), via openFDA
Source: FDA drug label (PROMACTA), Novartis Pharmaceuticals Corporation, effective December 18, 2025 (SPL set 7714a0ed-34bb-46e6-a0a5-b363908b22c2), via openFDA; the full label on DailyMed
What does the sulfasalazine label say about eltrombopag?
Sulfasalazine's label (effective May 29, 2026) does not name eltrombopag in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Azulfidine), Pfizer Laboratories Div Pfizer Inc, effective May 29, 2026 (SPL set ddbe69f3-bd55-45f3-a64f-f60226c744c4), 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
| Eltrombopag | Sulfasalazine | |
|---|---|---|
| Labeled for | Anemia | Crohn's disease and ulcerative colitis, Rheumatoid arthritis |
| Boxed warning | Yes | No |
| Pharmacy cost (NADAC) | $25.85 per tablet 50 mg tablet | $0.199 per tablet 500 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