It is very important that your doctor check your progress at regular visits to make sure that this medicine is working properly. Blood tests may be needed to check for unwanted effects.
If your symptoms do not improve, or if they become worse, check with your doctor. You may need to take this medicine for several weeks or months before your infection gets better.
Do not use itraconazole if you are also using the following medicines: avanafil (Stendra™), cisapride (Propulsid®), disopyramide (Norpace®), dofetilide (Tikosyn®), dronedarone (Multaq®), eliglustat (Cerdelga™), eplerenone (Inspra®), felodipine (Plendil®), irinotecan (Camptosar®), isavuconazole (Cresemba®), ivabradine (Corlanor®), lomitapide (Juxtapid™), lurasidone (Latuda®), methadone (Dolophine®), naloxegol (Movantik®), nisoldipine (Sular®), oral midazolam (Versed®), pimozide (Orap®), quinidine (Cardioquin®, Quinaglute®), ranolazine (Ranexa®), ticagrelor (Brilinta®), triazolam (Halcion®), an ergot medicine (eg, dihydroergotamine, ergometrine, ergotamine, methylergometrine, Cafergot®, Ergomar®, Wigraine®), or certain medicines to lower cholesterol (eg, lovastatin, simvastatin, Mevacor®, Zocor®). Do not use itraconazole together with colchicine (Colcrys®), fesoterodine (Toviaz®), solifenacin (Vesicare®), or telithromycin (Ketek®) if you have kidney or liver disease. Using these medicines together may increase your risk for serious side effects.
Make sure your doctor knows if you are pregnant or planning to get pregnant before you start using this medicine for a fingernail or toenail infection. The capsule or tablet should not be used to treat onychomycosis in pregnant women or those who are planning to get pregnant. Use a highly effective form of birth control while you are using this medicine and for 2 months after your last dose. If you think you have become pregnant while using the medicine, tell your doctor right away.
Check with your doctor right away if you are having chest pain, decreased urine output, dilated neck veins, extreme fatigue, irregular breathing, an irregular heartbeat, swelling of the face, fingers, feet, or lower legs, tightness in the chest, trouble breathing, or weight gain. These could be symptoms of a side effect called congestive heart failure.
Rarely, this medicine may cause severe liver problems. Check with your doctor right away if you are having more than one of these symptoms: stomach pain or tenderness, clay-colored stools, dark urine, decreased appetite, fever, headache, itching, loss of appetite, nausea, vomiting, skin rash, swelling of the feet or lower legs, unusual tiredness or weakness, or yellow eyes or skin.
This medicine may cause nerve problems. Call your doctor right away if your skin feels like it is burning, crawling, itching, or if you have numbness, prickling, "pins and needles", or a tingling feeling after using itraconazole.
Temporary or permanent hearing loss may occur while you are using this medicine. Check with your doctor right away if you have any changes in your hearing.
This medicine may make you feel dizzy or have blurred or double vision. Do not drive or do anything else that could be dangerous until you know how this medicine affects you.
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.