Metoclopramide 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.

Metoclopramide is a prescription anti-nausea medication that also helps move food through the upper digestive tract. In veterinary medicine, it is commonly used extra-label, which means your vet may prescribe a human-labeled drug for an animal when that use is medically appropriate. In birds, that matters because many medications are not specifically labeled for avian patients.

Pharmacologically, metoclopramide works as a dopamine antagonist and also has serotonin-related effects that can improve upper GI motility. It can increase movement in the esophagus, stomach, pylorus, and duodenum. For a macaw, your vet may consider it when there is concern about regurgitation, nausea, or slowed upper GI transit, but only after looking for the underlying cause.

Macaws can develop digestive signs for many different reasons, including infection, inflammation, toxin exposure, foreign material, reproductive disease, and neurologic GI disorders such as avian ganglioneuritis, historically called proventricular dilatation disease or macaw wasting disease. Because those causes vary so much, metoclopramide is usually supportive care, not a stand-alone answer.

Your vet may use metoclopramide in a macaw to help with nausea, regurgitation, or delayed emptying of the crop and upper gastrointestinal tract. It is most often part of a broader treatment plan that may also include fluids, heat support, assisted feeding, diagnostics, and treatment of the primary disease.

In birds with signs like undigested food in droppings, chronic weight loss, repeated regurgitation, or poor GI motility, your vet may discuss whether a prokinetic drug is reasonable. In macaws, those signs can overlap with serious disorders such as avian ganglioneuritis, so medication should never replace a proper workup.

Metoclopramide is not appropriate in every vomiting or regurgitation case. If a bird may have a blockage, GI bleeding, or another condition where pushing the gut to move could be harmful, your vet may avoid it and choose a different plan.

There is no safe one-size-fits-all home dose for macaws. Published veterinary references list metoclopramide at 0.1-0.5 mg/kg by mouth, under the skin, or into muscle every 6-8 hours, or 0.01-0.02 mg/kg/hour as an IV infusion in monitored patients. Those ranges come from general veterinary antiemetic guidance, and your vet may adjust them for a bird based on species, body weight, hydration, liver or kidney function, and the reason the drug is being used.

Bird dosing can be especially tricky because macaws vary widely in size, and even a small measuring error can matter. Your vet may prescribe a compounded liquid if a tablet strength is impractical for an avian patient. If your macaw is told to take the medication by mouth, your vet may recommend giving it 15-30 minutes before feeding in some cases, though some patients tolerate it better with a small amount of food.

Do not change the dose, frequency, or route on your own. If your macaw spits out the medication, vomits after a dose, becomes constipated, or seems more neurologic afterward, contact your vet before giving more.

Side effects reported across veterinary species include restlessness, hyperactivity, twitching or spasms, drowsiness, disorientation, constipation, and increased urination. Birds may not show those signs exactly the same way dogs and cats do, so pet parents should watch for agitation, unusual vocalizing, loss of balance, weakness, reduced appetite, fewer droppings, or behavior that seems "off."

Because macaws are prey animals, subtle changes can be important. Call your vet promptly if you notice worsening regurgitation, no droppings, marked sleepiness, tremors, frantic behavior, falling from the perch, or new weakness. Those signs may reflect a medication reaction, progression of the underlying illness, or both.

See your vet immediately if your macaw has severe lethargy, repeated vomiting or regurgitation, blood in droppings, collapse, seizures, or trouble breathing. In a bird, those are never wait-and-see signs.

Metoclopramide can interact with several other medications. Veterinary references advise caution with acepromazine, antihistamines, barbiturates, cephalexin, certain anesthetics, antidepressants, cholinergic drugs, cyclosporine, mirtazapine, selegiline, tetracyclines, and tramadol. Some of these combinations may increase sedation, change gut movement, or raise the risk of neurologic side effects.

That interaction list matters in macaws because birds with GI disease are often taking multiple medications at once, such as antibiotics, antifungals, pain control, crop support drugs, or appetite support. Even supplements and herbal products can matter.

Before starting metoclopramide, give your vet a full list of everything your macaw receives: prescription drugs, compounded medications, probiotics, hand-feeding formulas, supplements, and any recent at-home treatments. If your bird is scheduled for anesthesia or sedation, remind your vet that metoclopramide is on board.