itraconazole vs posaconazole
Side-by-side comparison of itraconazole and posaconazole Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
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Itraconazole capsules are an antifungal medicine. They treat fungal infections in your body.
Posaconazole is an antifungal medicine. It helps prevent certain fungal infections in people with weakened immune systems.
Itraconazole treats fungal infections like blastomycosis, histoplasmosis, and aspergillosis. It can help both people with healthy immune systems and those with weakened immune systems. It also treats onychomycosis, a fungal infection of the toenails or fingernails.
Posaconazole prevents Aspergillus and Candida infections. You may need this medicine if you have a high risk of getting these infections. This often includes people who had a stem cell transplant or have certain blood cancers and are on chemotherapy.
Itraconazole stops fungi from growing. It does this by interfering with the production of a substance fungi need to build their cell membranes. This eventually kills the fungus and clears the infection.
Posaconazole belongs to a class of drugs called azole antifungals. It works by stopping the growth of fungi. This helps your body fight off the infection.
- • Nausea
- • Rash
- • Headache
- • Diarrhea
- • Nausea
- • Fever
- • Vomiting
- • Headache
- Interaction with another medicine 1,118
- Medicine not working 1,100
- Using the medicine for something it's not approved for 606
- Fever 570
- Difficulty breathing 472
- Using the medicine for a condition it is not approved for 1,542
- The medicine is not working 1,434
- Fever with low white blood cell count 1,018
- The medicine is interacting with another medicine 930
- Death 928
Itraconazole can cause congestive heart failure. You should not take this medicine if you have heart problems. Itraconazole can also interact with many other medicines. Some of these interactions can be dangerous or even fatal. Check with your doctor about all the medicines you take.
Posaconazole can interact with many other medicines. It can cause heart rhythm problems (QT prolongation). It can also cause liver problems. Tell your doctor about all the medicines you take.
You should not take itraconazole if you are pregnant or plan to become pregnant. It can harm your unborn baby. Talk to your doctor about safe alternatives.
Posaconazole may harm an unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant. It is not known if posaconazole passes into breast milk, so talk to your doctor if you are breastfeeding.
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How to Read This itraconazole vs posaconazole Comparison
itraconazole is classified in the Azole Antifungal drug class, while posaconazole sits within the Azole Antifungal class. Because both drugs share the same classification, they are often considered interchangeable in theory — but clinical outcomes rarely track that cleanly. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, itraconazole has 3,866 submissions while posaconazole has 5,852. Those figures reflect cumulative reporting volume — not per-patient risk — so older, widely dispensed drugs typically look worse on count alone. No direct interaction between these two drugs is listed in our FDA-derived dataset, though co-prescription still warrants pharmacist review. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between itraconazole and posaconazole — always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.