Amoxicillin-Clavulanate 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.

Amoxicillin-clavulanate is a prescription antibiotic combination. Amoxicillin is a penicillin-type drug that kills certain bacteria, while clavulanate helps protect amoxicillin from bacterial enzymes that can break it down. In birds, including macaws, it is typically used extra-label, which means the medication is not specifically FDA-approved for macaws but may still be prescribed legally and appropriately by your vet when it fits the case.

For pet birds, this medication is usually given by mouth as a liquid or compounded preparation. Merck lists amoxicillin-clavulanate among antimicrobials used in pet birds, but also notes that avian doses can vary by species and by the infection being treated. That matters in macaws, because a large parrot with a crop problem, sinus infection, or wound may need a different plan than a smaller bird with a different bacterial disease.

This is not a broad answer for every sick macaw. Many bird illnesses look similar at home, and antibiotics do not treat viral, fungal, or many husbandry-related problems. Your vet may recommend testing such as cytology, culture, bloodwork, or imaging before choosing this drug, especially if your macaw is very ill or has not responded to prior treatment.

Your vet may prescribe amoxicillin-clavulanate for a macaw when there is concern for a susceptible bacterial infection. Depending on exam findings and test results, that can include some respiratory infections, skin and soft tissue infections, oral infections, wound infections, or bite injuries. In companion animal medicine, this drug is commonly used for bacteria that are susceptible to penicillin-type antibiotics, including some gram-positive and some gram-negative organisms.

In birds, the key question is not whether the drug exists, but whether it is the right match for the organism. Macaws can develop bacterial disease secondary to poor diet, chronic stress, inhaled irritants, trauma, or another underlying illness. If the wrong antibiotic is chosen, the bird may keep declining while appetite, hydration, and droppings worsen.

That is why your vet may recommend a culture and sensitivity test in more serious or recurrent cases. This helps confirm whether amoxicillin-clavulanate is likely to work, or whether another antibiotic would be a better fit. It also supports more responsible antibiotic use, which matters for both your bird and antimicrobial stewardship.

For pet birds, Merck Veterinary Manual lists amoxicillin-clavulanate at 125 mg/kg by mouth, 2 to 3 times daily, while also noting that dose and frequency may vary with the species treated and the cause of infection. That published avian dose is a reference point, not a home-treatment instruction. Your vet may adjust the plan based on your macaw's exact weight, hydration status, organ function, severity of illness, and the formulation being used.

Macaws are large parrots, but even in a big bird, small measuring errors matter. Liquid suspensions must be shaken well and measured carefully. Because medicating birds can be stressful, your vet may choose a compounded concentration that allows a smaller volume per dose. Merck's avian handling guidance also notes that oral medication should be placed carefully into the side of the mouth to reduce stress, medication loss, and aspiration risk.

This medication is often given with food to reduce stomach upset. If your macaw spits out part of a dose, vomits, or you are not sure how much was swallowed, call your vet before redosing. Do not change the schedule, stop early when your bird seems brighter, or use leftover antibiotics from another pet. In birds, incomplete or inaccurate dosing can make treatment failure more likely.

The most common side effects reported with amoxicillin-clavulanate are digestive upset, including decreased appetite, vomiting, and diarrhea. In a macaw, those problems may show up as reduced interest in food, regurgitation, looser droppings, more wet droppings, or a bird that becomes quieter and fluffed after dosing. Mild stomach upset can sometimes improve when the medication is given with food, but your vet should still know if signs continue.

Birds can hide decline very well, so watch for behavior changes, not only droppings. A macaw that becomes sleepy, weak, reluctant to perch, or less interactive may be reacting poorly to the medication, worsening from the underlying infection, or both. If your bird stops eating, starts open-mouth breathing, or seems unstable on the perch, that is more urgent.

Rare but serious reactions include allergic responses. In other veterinary species, VCA lists irregular breathing, fever, swelling, and other hypersensitivity signs as reasons to contact your veterinarian immediately. In a macaw, any breathing change, facial swelling, sudden collapse, or dramatic worsening after a dose should be treated as an emergency. See your vet immediately.

Amoxicillin-clavulanate can interact with other medications, so your vet should know everything your macaw is getting: prescriptions, supplements, probiotics, over-the-counter products, hand-feeding formulas, and any compounded medications. Merck's avian medication guidance specifically advises pet parents to tell your vet about every substance being given, because some combinations can be risky.

VCA lists several drugs that should be used with caution alongside amoxicillin-clavulanate, including chloramphenicol, erythromycin, tetracycline, pentoxifylline, and cephalosporins. In practical terms, some antibiotics can interfere with each other, duplicate coverage, or complicate how your vet interprets response to treatment.

Drug interaction concerns are especially important in macaws with liver or kidney disease, dehydration, or multiple ongoing treatments. If your bird is already on pain medication, antifungals, GI support, or another antibiotic, ask your vet whether timing changes, monitoring, or a different medication plan would be safer. Never combine antibiotics on your own.