Drug interactions
Itraconazole + Lansoprazole
Severity: Major
Itraconazole and Lansoprazole: major interaction.
Last updated Sources: US FDA label
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Reduced gastric acid lowers absorption of itraconazole capsules, risking subtherapeutic levels and antifungal failure. Oral solution is less affected.
What this interaction means in plain words
Itraconazole and Lansoprazole can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Itraconazole belongs to Anti Fungals; Lansoprazole belongs to Gastrointestinal Tract.
Why it happens
Raised gastric pH decreases dissolution and absorption of itraconazole capsules.
What to do
Avoid PPIs with itraconazole capsules or switch to the oral solution. Monitor itraconazole levels and clinical response.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
Other interactions of Lansoprazole
- Lansoprazole + Mavacamten Contraindicated
- Lansoprazole + Rilpivirine Contraindicated
- Acalabrutinib + Lansoprazole Major
- Atazanavir + Lansoprazole Major
- Dacomitinib + Lansoprazole Major
- Dasatinib + Lansoprazole Major
Other interactions of Itraconazole
- Alfuzosin + Itraconazole Contraindicated
- Alprazolam + Itraconazole Contraindicated
- Avanafil + Itraconazole Contraindicated
- Conivaptan + Itraconazole Contraindicated
- Dihydroergotamine intranasal + Itraconazole Contraindicated
- Dihydroergotamine + Itraconazole Contraindicated
Frequently asked questions
Can I take Itraconazole with Lansoprazole?
MediHelp rates the interaction as major. Itraconazole and Lansoprazole can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Reduced gastric acid lowers absorption of itraconazole capsules, risking subtherapeutic levels and antifungal failure. Oral solution is less affected.
How serious is the interaction between Itraconazole and Lansoprazole?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid PPIs with itraconazole capsules or switch to the oral solution. Monitor itraconazole levels and clinical response.
What other medicines interact with Lansoprazole?
MediHelp also lists interactions of Lansoprazole with, for example, Mavacamten, Rilpivirine, Acalabrutinib. The full list is on the Lansoprazole page.
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