What the FDA labels say about taking them together
Afatinib and ketoconazole
Afatinib's FDA label of November 13, 2025 names ketoconazole in its drug interactions section; the ketoconazole label PlainMeds reads does not name afatinib. The afatinib label: “Increase GILOTRIF by 10 mg per day as tolerated. Effect of P-glycoprotein (P-gp) Inhibitors and Inducers Concomitant taking of P-gp inhibitors with GILOTRIF can increase exposure to afatinib.”
Check it at the source: the afatinib FDA label on DailyMed (effective November 13, 2025, Boehringer Ingelheim Pharmaceuticals, Inc.); the ketoconazole FDA label on DailyMed (effective January 28, 2026, E. Fougera & Co. a division of Fougera Pharmaceuticals, LLC).
What does the afatinib label say about ketoconazole?
Afatinib label, drug interactionsIncrease GILOTRIF by 10 mg per day as tolerated. ( 2.5 , 7 ) Effect of P-glycoprotein (P-gp) Inhibitors and Inducers Concomitant taking of P-gp inhibitors (including but not limited to ritonavir, cyclosporine A, ketoconazole, itraconazole, erythromycin, verapamil, quinidine, tacrolimus, nelfinavir, saquinavir, and amiodarone) with GILOTRIF can increase exposure to afatinib [see Clinical Pharmacology (12.3) ].
Source: FDA drug label (Gilotrif), Boehringer Ingelheim Pharmaceuticals, Inc., effective November 13, 2025 (SPL set fd638e5e-8032-e7ca-0179-95e96ab5d387), via openFDA; the full label on DailyMed
What does the ketoconazole label say about afatinib?
Ketoconazole's label (effective January 28, 2026) does not name afatinib in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (ketoconazole), E. Fougera & Co. a division of Fougera Pharmaceuticals, LLC, effective January 28, 2026 (SPL set cad7c647-34a9-4e4e-83b3-8d78e58f588f), 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
| Afatinib | Ketoconazole | |
|---|---|---|
| Labeled for | Lung cancer | Fungal infections |
| Boxed warning | No | No |
| Pharmacy cost (NADAC) | n/a | $0.249 per gram 2% cream |
| 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