What the FDA labels say about taking them together
Afatinib and nelfinavir
Afatinib's FDA label of November 13, 2025 names nelfinavir in its drug interactions section; the nelfinavir 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 nelfinavir FDA label on DailyMed (effective December 11, 2025, AGOURON).
What does the afatinib label say about nelfinavir?
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 nelfinavir label say about afatinib?
Nelfinavir's label (effective December 11, 2025) 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 (VIRACEPT), AGOURON, effective December 11, 2025 (SPL set e72c2bc6-9462-4a2e-8e1d-b97592376cbd), 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 | Nelfinavir | |
|---|---|---|
| Labeled for | Lung cancer | HIV |
| Boxed warning | No | No |
| Pharmacy cost (NADAC) | n/a | n/a |
| 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