Why Use Benazepril for Dogs? — Heart and Kidney Protection Effects and Precautions

HeartQ&AMeongsiljang Veterinary Advisory Board

Benazepril is an ACE inhibitor prescribed for dogs with heart disease and proteinuric kidney disease. We’ve summarized how it works and important precautions for administration, explained in plain language for pet owners.

What Kind of Medication Is Benazepril?

A veterinarian showing benazepril tablets to a puppy.

Benazepril is an ACE inhibitor used to treat heart disease and proteinuric kidney disease in dogs. Its primary function is to dilate blood vessels, thereby reducing the excessive strain on the heart and kidneys caused by narrowed vessels. This medication requires a veterinarian’s prescription and should never be started or stopped without professional guidance. It is typically prescribed for long-term, lifelong use.

Why Is It Used for Both the Heart and Kidneys?

Benazepril inhibits angiotensin, a hormone that narrows blood vessels and causes the kidneys to retain water and sodium. When this effect becomes excessive, the heart must work harder to pump blood, and increased pressure in the kidney’s glomeruli can lead to protein leakage into the urine. Benazepril breaks this cycle, reducing both cardiac workload and proteinuria. As a result, it is widely prescribed for mitral valve insufficiency, heart failure, and chronic kidney disease.

In What Situations Is It Prescribed?

Here are the primary conditions for which benazepril is commonly prescribed.

Chronic heart failure, including mitral valve insufficiency and dilated cardiomyopathy: It is used to manage chronic heart failure arising from various causes, such as chronic valvular insufficiency, dilated cardiomyopathy, and hypertrophic cardiomyopathy. Your veterinarian will determine the appropriate timing and stage for administration based on cardiac examination results.

Congestive heart failure (Stage C): It serves as a key component of combination therapy, used alongside diuretics and positive inotropes.

Proteinuric chronic kidney disease: It helps reduce glomerular pressure when the urine protein-to-creatinine ratio is elevated.

Systemic hypertension: It is the first-line antihypertensive agent for dogs and may be combined with other blood pressure medications if necessary.

An elderly dog under cardiac care resting comfortably at home

Benazepril vs. Enalapril: What’s the Difference?

Item	Benazepril	Enalapril
Metabolic pathway	Metabolized in the liver to its active form (benazeprilat), and in dogs it is excreted almost equally in urine and bile	An ACE inhibitor converted to an active form, but the detailed excretion route is difficult to confirm from the available evidence
With concurrent kidney disease	Frequently chosen in animals with kidney disease; however, no clear superiority over enalapril has been reported for proteinuria·hypertension in CKD	No clear superiority over benazepril, so used at the veterinarian's discretion
Daily dosing frequency	Once (twice in some cases)	Mainly 1–2 times
Main indications	Heart failure·proteinuric kidney disease·hypertension	Heart failure·proteinuric kidney disease·hypertension

The actual choice must follow the veterinarian's judgment. Owners should not switch medications on their own.

Administration: Just Remember This

Benazepril can be given with or without food. Once you choose a method, stick to the same routine every day. The standard dose is once daily at a set time, though it may be increased to twice daily depending on the severity of heart failure. If you miss a dose, give it as soon as you remember; however, if it’s close to the next scheduled dose, skip the missed one and resume your regular schedule. Never give two doses at once.

Contact Your Veterinarian Immediately in These Cases

If any of the following symptoms occur while your pet is taking benazepril, do not stop the medication on your own; contact your veterinarian immediately. - A sudden loss of appetite, with no food intake for more than 24 hours - Repeated vomiting or diarrhea, or noticeable lethargy and weakness - Pale gums or signs of collapsing - A sudden decrease in urine output or almost no urination - Signs suggesting dehydration (or immediately after prolonged travel on a hot day)

Medications to Use with Caution When Combined

Benazepril directly affects blood pressure and kidney function, so it has many drug interactions to watch out for.

Nonsteroidal anti-inflammatory drugs (NSAIDs): These can reduce kidney blood flow alongside benazepril, increasing the risk of acute kidney injury.

Diuretics (such as furosemide): While often used together, they carry a risk of initial hypotension and dehydration.

Potassium supplements and certain potassium-sparing diuretics: These increase the risk of hyperkalemia.

Anesthetics and sedatives: These can cause further drops in blood pressure, so it’s essential to inform your veterinarian about all medications your pet is taking before surgery.

A veterinarian reviewing a dog’s medication list

Regular Monitoring During Administration

Benazepril is a medication whose efficacy and safety are monitored through specific laboratory values. After starting treatment, your veterinarian will check blood levels of creatinine, BUN, and electrolytes (especially potassium). If these results are normal, follow-up blood tests will be scheduled at regular intervals as determined by your vet. If the medication is being used to manage proteinuria, the urine protein-to-creatinine ratio (UPC) will also be tracked. For pets with heart failure, periodic heart ultrasounds and chest X-rays are necessary to monitor heart size and check for pulmonary congestion.

Contraindicated in Pregnancy and Puppies

ACE inhibitors are contraindicated during pregnancy. If you have breeding plans for your dog, please inform your veterinarian in advance. Additionally, use is restricted or requires extreme caution in cases of acute kidney injury, severe dehydration, or severe hypotension. When initiating benazepril in patients receiving intensive diuretic therapy or with unstable systemic conditions, closely monitor for the development of azotemia.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Does benazepril need to be given for life?

These medications are prescribed to slow the progression of heart failure and chronic kidney disease, so they are typically intended for lifelong use. Stopping them without your veterinarian’s guidance can cause symptoms to worsen rapidly.

My pet seems lethargic after taking the medication. Is this normal?

Benazepril lowers blood pressure, so your pet may appear temporarily lethargic as their blood pressure drops slightly when first starting the medication. However, if this is accompanied by loss of appetite, vomiting, or collapse, contact your veterinarian immediately.

Can I split a human benazepril tablet and give it to my pet?

Even if the active ingredients are the same, it’s essential to calculate the exact dosage based on your dog’s weight and assess its safety. Giving human medications to your dog without a veterinarian’s prescription can be dangerous.

Is it safe to take this with diuretics?

Combining diuretics with other medications is a very common approach in treating heart failure. However, because there is a risk of dehydration and low blood pressure in the early stages, it is essential to carefully monitor kidney function and electrolyte levels through blood tests.

I missed a dose by accident. What should I do?

Administer the medication as soon as you remember, but if it’s close to the next scheduled dose, skip the missed one and resume the regular schedule. Never give two doses at once.

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References

[1] Plumb's Veterinary Drug Handbook, 10th Edition - Benazepril HCl

[2] BENCH (BENazepril in Canine Heart disease) Study Group, Journal of Veterinary Internal Medicine, 1999

[3] Small Animal Internal Medicine, 6th Edition - ACE Inhibitors in Cardiac and Renal Disease

[4] King JN et al., Clinical safety of benazepril in dogs, J Vet Pharmacol Ther, 2003