Benazepril (Fortekor) for Dogs: Uses, Dosage & Side Effects

This guide is educational and is not a substitute for care from your vet. Benazepril is a prescription medication, and the right dose depends on your dog’s diagnosis, kidney values, blood pressure, hydration status, and other medications.

Call your vet promptly if your dog becomes weak, collapses, stops eating, vomits repeatedly, seems unusually tired, or has major changes in thirst or urination after starting benazepril. These signs can happen if blood pressure drops too low or if kidney function changes.

Do not start, stop, split, or increase benazepril without veterinary guidance. Monitoring matters. Your vet will usually recommend follow-up bloodwork and blood pressure checks after starting treatment or changing the dose.

Benazepril is an ACE inhibitor used in dogs to support the heart, blood vessels, and kidneys. It is converted in the liver to its active form, benazeprilat, which helps block the renin-angiotensin-aldosterone system. In practical terms, that means it helps blood vessels relax and reduces some of the hormone signals that make the body hold onto salt and water.

For dogs with heart disease, benazepril can reduce the workload on the heart by lowering vascular resistance and easing filling pressures. For dogs with kidney disease, it may help reduce protein loss into the urine and can be part of a broader plan for proteinuric kidney disease.

Benazepril is commonly used in veterinary medicine even though many canine uses are extra-label in the United States. That is normal in veterinary practice. Your vet may choose benazepril because it is familiar, widely available as a generic, and often fits well into long-term heart or kidney care plans.

Benazepril is most often used in dogs with congestive heart failure, especially as part of combination therapy rather than as a stand-alone medication. In many dogs with heart failure, your vet may pair it with medications such as pimobendan and a diuretic like furosemide, depending on the stage of disease and your dog’s exam findings.

It is also used for some kidney conditions, especially when protein is leaking into the urine. Lowering that protein loss can be an important treatment goal because persistent proteinuria can worsen kidney damage over time.

Some dogs also receive benazepril for systemic hypertension. However, ACE inhibitors usually have only a modest blood-pressure-lowering effect, so dogs with more severe hypertension may need additional or different medications. The best plan depends on whether the main problem is heart disease, kidney disease, high blood pressure, or a mix of all three.

A commonly referenced canine dose range is 0.25 to 0.5 mg/kg by mouth every 12 to 24 hours. Some dogs are started at the lower end and adjusted upward based on response and monitoring. In heart failure, every-12-hour dosing is often used when your vet wants more continuous ACE inhibition through the day.

Benazepril may be given with or without food. If your dog gets stomach upset on an empty stomach, your vet may suggest giving it with a meal. Do not double up if you miss a dose unless your vet specifically tells you to do that.

Monitoring is a key part of safe dosing. Your vet may recommend a recheck within about 1 to 2 weeks after starting benazepril or changing the dose, then periodic bloodwork and blood pressure checks after that. Kidney values, electrolytes, hydration, and urine protein trends all help your vet decide whether the current plan is still the right fit.

Many dogs tolerate benazepril well, but side effects can happen. The most common concerns are low blood pressure, decreased appetite, vomiting, diarrhea, lethargy, and weakness. Some dogs may also seem wobbly or less coordinated.

The side effect your vet watches most closely is a drop in blood pressure that is too strong for your dog. That can show up as weakness, fainting, collapse, unusual tiredness, or acting "off" after a dose. Dogs that are dehydrated, critically ill, or already have kidney problems may be at higher risk.

Benazepril can also contribute to changes in kidney values or potassium levels, especially when combined with other medications that affect blood pressure, fluid balance, or kidney blood flow. Contact your vet if your dog stops eating, vomits repeatedly, becomes very sleepy, seems weak, or has sudden changes in urination.

Benazepril is often used safely with other heart medications, including furosemide and pimobendan, when your vet is monitoring the plan. That said, combining several cardiovascular drugs can increase the chance of low blood pressure, so follow-up checks matter.

Use extra caution with NSAIDs such as carprofen, meloxicam, or deracoxib. NSAIDs can reduce the blood-pressure effect of ACE inhibitors and may increase the risk of acute kidney injury when used together, especially in dogs that are dehydrated or already have kidney disease.

Your vet will also pay attention to potassium-sparing diuretics such as spironolactone, potassium supplements, and other blood-pressure medications. These combinations can still be appropriate, but they may require closer monitoring of kidney values, electrolytes, and blood pressure.