Itraconazole for Macaws: Uses, Dosing & Side Effects

This information is for educational purposes only. Never give your pet any medication without your veterinarian's guidance. Dosing, frequency, and safety depend on your pet's specific health profile.

Itraconazole is a prescription triazole antifungal. Your vet may use it in macaws and other pet birds when a fungal infection is suspected or confirmed. In avian medicine, it is most often discussed for Aspergillus infections, but it may also be considered for some other fungal diseases depending on test results and the part of the body involved.

In birds, itraconazole is usually given by mouth as a liquid, capsule, or tablet formulation. It is considered an extra-label medication in many veterinary patients, which means your vet is using it based on veterinary evidence and clinical experience rather than a bird-specific FDA label. That is common in exotic animal medicine.

Itraconazole can be very useful, but it is not a medication to start at home without guidance. Macaws vary in size, liver health, appetite, and ability to tolerate oral medication. Your vet may also choose a different antifungal if your bird has a high-risk history, severe respiratory disease, or if culture, imaging, or endoscopy suggests another drug may fit better.

In macaws, itraconazole is most commonly used as part of treatment for aspergillosis, a fungal disease that often affects the respiratory tract, including the lungs and air sacs. Birds with aspergillosis may show voice changes, tail bobbing, open-mouth breathing, exercise intolerance, weight loss, or reduced appetite. Some birds are very sick, while others have subtle signs at first.

Your vet may also consider itraconazole for other susceptible fungal infections when exam findings and testing support that choice. In birds, fungal disease can involve the mouth, crop, skin, sinuses, or deeper tissues. The exact medication plan often depends on where the infection is located and whether your macaw needs oral medication alone or a combination approach.

Treatment is rarely one-size-fits-all. Some macaws do well with oral antifungal therapy and close rechecks. Others need a broader plan that may include imaging, fungal testing, nebulization, oxygen support, hospitalization, or endoscopic evaluation. Because respiratory fungal disease can progress quietly, early veterinary follow-up matters.

Typical published avian itraconazole dosing ranges are 5-10 mg/kg by mouth once to twice daily in pet birds, and some references list 10 mg/kg by mouth every 24 hours or 5-15 mg/kg by mouth every 12 hours with food depending on the species, formulation, and clinical situation. That does not mean every macaw should receive the same dose. Your vet will choose the dose and schedule based on your bird's weight, species, liver status, appetite, and the suspected fungus.

Macaws are large psittacines, so even small math errors can matter. Never estimate a dose from another bird's prescription. Your vet may prefer a liquid for accuracy, or a capsule or tablet if the formulation is more reliable for your bird's case. If a dose is missed, contact your vet for guidance; in general, do not double the next dose unless your vet specifically tells you to.

Itraconazole treatment often lasts weeks to months, especially for respiratory fungal disease. Many birds need repeat exams and liver monitoring during longer courses. If your macaw starts vomiting, stops eating, seems weaker, or breathing looks worse after starting treatment, see your vet promptly. Those changes can reflect medication intolerance, disease progression, or both.

Commonly reported side effects with itraconazole include decreased appetite, vomiting or regurgitation, weight loss, and digestive upset. Some animals also develop extra drooling or salivation with the oral solution. In a bird, even mild appetite loss matters because small changes in food intake can become serious quickly.

More concerning adverse effects include liver toxicity and, less commonly, skin ulceration, swelling, or inflammation of blood vessels. Warning signs can include yellow discoloration, ongoing vomiting, severe diarrhea, abdominal pain, behavior changes, marked lethargy, or sudden worsening in condition. If you notice any of these, stop and contact your vet right away unless your vet has already given different instructions.

Bird species do not all tolerate azole antifungals the same way. Published veterinary references specifically note that African grey parrots may be more sensitive to itraconazole, so avian vets may reduce the dose or avoid it in that species. While that warning is not directed at macaws, it is a good reminder that parrots can respond differently, and your vet may adjust the plan if your macaw has liver disease, heart disease, poor appetite, or other medications on board.

Itraconazole has many potential drug interactions because it can affect how other medications are absorbed and metabolized. Veterinary references advise caution with antacids, H2 blockers, proton-pump inhibitors, benzodiazepines, calcium channel blockers, cisapride, corticosteroids, cyclosporine, ivermectin, macrolide antibiotics, phenobarbital, sildenafil, fentanyl, methadone, meloxicam, ciprofloxacin, and tricyclic antidepressants.

For macaws, the most practical takeaway is this: tell your vet about every medication and supplement your bird receives, including compounded drugs, probiotics, herbal products, nebulized medications, and over-the-counter items. Acid-reducing drugs can affect absorption, and some liver-metabolized drugs may become stronger or weaker when combined with itraconazole.

Do not start, stop, or mix medications at home without checking first. If your macaw is being treated for a respiratory problem, pain, inflammation, seizures, or gastrointestinal disease at the same time, your vet may need to adjust the schedule, choose a different antifungal, or monitor bloodwork more closely.