Enalapril 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.

Enalapril is a prescription ACE inhibitor. It works by blocking part of the renin-angiotensin-aldosterone system, which can reduce harmful blood-vessel constriction and lower the workload on the heart. In veterinary medicine, it is widely used in dogs and cats, and its use in birds is considered off-label, meaning your vet may prescribe it when the expected benefit fits your macaw's condition.

In macaws and other parrots, enalapril is usually considered a supportive heart medication, not a cure. It may be used as part of a broader plan that can also include oxygen support, diuretics, imaging, blood pressure checks, and treatment of the underlying heart or vascular problem.

Because birds process medications differently from mammals, avian dosing is not a direct copy of dog or cat dosing. Published avian references and pharmacokinetic work in birds support bird-specific dosing decisions, which is why your vet may recommend a liquid compound or a carefully measured oral dose rather than a standard human tablet.

In macaws, enalapril is most often used as part of treatment for congestive heart failure, systemic hypertension, or other cardiac conditions where reducing afterload may help the heart pump more effectively. Avian cardiology references also describe ACE inhibitors as an option in some birds with suspected atherosclerotic disease or heart enlargement, depending on the full clinical picture.

Your vet may consider enalapril when a macaw has signs such as exercise intolerance, increased breathing effort, weakness, fluid buildup, or imaging findings that suggest heart disease. It is usually not used alone in unstable birds. Instead, it may be paired with medications such as diuretics or other cardiovascular drugs when monitoring is available.

Not every macaw with heart disease is a good candidate. Birds with dehydration, poor kidney perfusion, acute kidney injury, or low blood pressure may need a different plan. The best use of enalapril depends on exam findings, bloodwork, blood pressure, and how sick the bird is at the time treatment starts.

Enalapril dosing in birds should be set by an avian veterinarian. Published bird data support a starting dose around 1.25 mg/kg by mouth every 12 hours in some avian patients, including Amazon parrots studied for pharmacokinetics. Avian cardiology formularies also list a broader clinical range of 1.25-5 mg/kg by mouth twice daily for birds, with the exact dose adjusted to the species, diagnosis, response, and monitoring results.

For macaws, your vet may start at the lower end and increase only if needed. That is because response can vary with hydration status, kidney function, concurrent diuretics, and the severity of heart disease. Birds often need compounded liquid medication so the dose can be measured accurately for their body weight.

Give enalapril exactly as prescribed. It is usually given by mouth and may be given with or without food, though some birds tolerate it better with a small amount of food. Do not change the dose, skip repeated doses, or stop the medication abruptly unless your vet tells you to. Follow-up monitoring commonly includes kidney values, electrolytes, and blood pressure after starting therapy and again once your macaw is stable.

Most reported side effects with enalapril are related to the digestive tract, blood pressure, or kidney perfusion. In veterinary references, common concerns include decreased appetite, vomiting, diarrhea, and tiredness or lethargy. In birds, pet parents may notice reduced activity, less interest in food, or weakness rather than obvious vomiting.

More serious problems can include low blood pressure, collapse, worsening kidney function, or high potassium levels. Risk is higher if a macaw is dehydrated, already has kidney disease, or is taking other medications that affect blood pressure or fluid balance.

See your vet immediately if your macaw becomes very weak, falls from the perch, has markedly increased breathing effort, stops eating, seems unusually sleepy, or produces sudden changes in droppings after starting the medication. These signs do not always mean enalapril is the cause, but they do mean your bird needs prompt reassessment.

Enalapril can interact with several medications commonly used in sick birds. Veterinary references advise caution when it is combined with diuretics, other antihypertensive drugs, vasodilators, sildenafil, digoxin, potassium supplements, and potassium-sparing diuretics such as spironolactone. These combinations may still be appropriate, but they usually require closer monitoring.

ACE inhibitors can also increase the risk of kidney injury when used with NSAIDs. In addition, combining enalapril with other drugs that lower blood pressure or with anesthetic agents can increase the chance of hypotension during treatment or procedures.

Tell your vet about every medication, supplement, and herbal product your macaw receives. That includes compounded drugs, over-the-counter pain relievers, electrolyte products, and anything added to food or water. In birds, even small dosing errors or overlooked combinations can matter.