What the FDA labels say about taking them together
Itraconazole and lansoprazole
Lansoprazole's FDA label of June 24, 2025 names itraconazole in its drug interactions (prescription label) section; itraconazole's label does not name lansoprazole itself but warns about its class (Proton pump inhibitors (PPIs)). The lansoprazole label: “Lansoprazole can reduce the absorption of other drugs due to its effect on reducing intragastric acidity.”
Check it at the source: the itraconazole FDA label on DailyMed (effective July 13, 2026, Janssen Pharmaceuticals, Inc.); the lansoprazole FDA label on DailyMed (effective June 24, 2025, L. Perrigo Company).
What does the itraconazole label say about lansoprazole?
Itraconazole's label does not name lansoprazole itself; it warns about its class (Proton pump inhibitors (PPIs)):
Itraconazole label, drug interactionsGastrointestinal Drugs Drugs that reduce gastric acidity e.g., acid neutralizing medicines such as aluminum hydroxide, or acid secretion suppressors such as H 2 - receptor antagonists and proton pump inhibitors.
Source: FDA drug label (SPORANOX), Janssen Pharmaceuticals, Inc., effective July 13, 2026 (SPL set a4d555fa-787c-40fb-bb7d-b0d4f7318fd0), via openFDA; the full label on DailyMed
What does the lansoprazole label say about itraconazole?
Lansoprazole label, drug interactions (prescription label)Clinical Impact: Lansoprazole can reduce the absorption of other drugs due to its effect on reducing intragastric acidity. Intervention: Mycophenolate mofetil (MMF): Coadministration of PPIs in healthy subjects and in transplant patients receiving MMF has been reported to reduce the exposure to the active metabolite, mycophenolic acid (MPA), possibly due to a decrease in MMF solubility at an increased gastric pH. …
Source: FDA drug label (Prevacid 24 HR), L. Perrigo Company, effective June 24, 2025 (SPL set 205c9c1e-b422-4e86-a4b0-714b608adc19), 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
| Itraconazole | Lansoprazole | |
|---|---|---|
| Labeled for | Fungal infections | Acid reflux and ulcers |
| Boxed warning | Yes | No |
| Pharmacy cost (NADAC) | $0.910 per capsule 100 mg capsule | $0.106 per capsule 30 mg capsule |
| Shortage now | A presentation being discontinued | 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