Ivermectin 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.

Ivermectin is a macrocyclic lactone antiparasitic medication. In veterinary medicine, it is used to treat certain parasites by interfering with nerve and muscle function in the parasite. In birds, including macaws, your vet may consider it for selected external parasites such as some mites and lice, and for some internal roundworm-type parasites when testing or exam findings support that choice.

In macaws, ivermectin is usually an extra-label medication, which means your vet is using a drug based on veterinary judgment rather than a macaw-specific FDA label. That is common in avian medicine. It also means the exact dose, route, and schedule can vary a lot depending on your bird's species, body weight, hydration, liver function, parasite type, and how sick your bird is.

Because macaws are sensitive patients and concentrated livestock products can be easy to overdose, ivermectin should never be given without your vet's instructions. A tiny measuring error can matter in a bird.

Your vet may use ivermectin in a macaw when there is concern for susceptible mites, some lice, or selected nematode parasites. In pet birds, ivermectin is most often discussed for mite-related problems rather than as a routine dewormer. It is not a cure-all for every itchy bird, every feather problem, or every parasite.

That matters because feather damage, scratching, crusting around the face or legs, breathing noise, and poor feather quality can also come from infection, nutrition problems, stress, liver disease, allergies, or behavior-related feather destruction. If the wrong problem is treated with ivermectin, the real cause may keep getting worse.

Your vet may recommend testing, skin or feather exam, fecal testing, or environmental treatment along with medication. In many cases, treating the bird and the environment is part of the plan, especially when mites or lice are involved.

There is no single safe at-home dose for every macaw. Avian dosing depends on the parasite being treated, the concentration of the product, and whether your vet chooses an oral, topical, or injectable route. Published avian references and wildlife formularies include ivermectin doses around 0.2 mg/kg in birds, but those references are not a substitute for a macaw-specific prescription. Some mite protocols are repeated after 1 to 2 weeks or given as a short series so newly hatched parasites are also addressed.

Macaws are large parrots, but that does not make dosing easier. Many ivermectin products are made for livestock and are far too concentrated for direct use in a pet bird without veterinary dilution. A few drops too much can cause serious neurologic toxicity.

You can help your vet dose more safely by bringing your macaw's current weight in grams, a list of all medications and supplements, and photos or videos of the symptoms. If your vet prescribes ivermectin, ask them to write down the exact concentration, route, amount, frequency, and when to repeat or stop.

Mild side effects can include temporary decreased appetite, loose droppings, mild lethargy, or irritation at the application site if a topical product is used. Some birds tolerate ivermectin well when it is correctly prescribed and diluted, but side effects can still happen.

The more serious concern is overdose or sensitivity, which can cause neurologic signs. In birds, pet parents should watch for weakness, wobbliness, tremors, inability to perch normally, marked sleepiness, drooping, vomiting or regurgitation, trouble breathing, or seizures. These signs need urgent veterinary attention.

See your vet immediately if your macaw seems suddenly quiet, uncoordinated, or less responsive after a dose. Bring the medication container with you. Concentration errors are one of the biggest risks with ivermectin in birds.

Ivermectin can interact with other medications that affect how drugs move through the body and brain. In veterinary medicine, caution is often advised when ivermectin is combined with P-glycoprotein inhibitors or drugs that may increase ivermectin exposure, such as cyclosporine, ketoconazole, itraconazole, erythromycin or clarithromycin, and some calcium channel blockers like verapamil or diltiazem.

Not every interaction has been specifically studied in macaws, so avian vets often make careful risk-based decisions. Sedatives, other neurologically active drugs, dehydration, and liver disease may also change how safely a bird handles medication.

Before your macaw starts ivermectin, tell your vet about all prescriptions, over-the-counter products, supplements, probiotics, and any recent parasite treatments. That includes products used in the cage, aviary, or on other birds in the household.