Benazepril Drug Profile

What is Benazepril?

Benazepril is an angiotensin-converting enzyme (ACE) inhibitor medication used primarily to treat high blood pressure and heart failure. As part of the ACE inhibitor class, it helps relax blood vessels and reduce the workload on the heart. This medication is available in tablet form and requires a prescription from a healthcare provider.

Uses

• Hypertension (High Blood Pressure): The primary use of benazepril is to lower blood pressure in adults, helping to reduce the risk of heart attack, stroke, and kidney problems.
• Heart Failure: Used to improve symptoms and survival in patients with heart failure by reducing the heart’s workload and improving its pumping efficiency.
• Diabetic Nephropathy: Helps protect kidney function in diabetic patients by reducing protein in the urine and slowing kidney damage progression.
• Post-Heart Attack Protection: May be prescribed after a heart attack to improve survival and prevent future cardiovascular events.
• Chronic Kidney Disease: Used to slow the progression of kidney disease in patients with or without diabetes.

How it works

Benazepril works by blocking the angiotensin-converting enzyme, which is responsible for producing angiotensin II, a hormone that causes blood vessels to narrow and triggers the release of another hormone that increases blood pressure. By inhibiting this enzyme, benazepril allows blood vessels to relax and widen, reducing blood pressure and decreasing the amount of work the heart must do to pump blood throughout the body.

Side effects

Common side effects:

• Dry cough (persistent and non-productive)
• Dizziness or lightheadedness
• Headache
• Fatigue or weakness
• Nausea
• Low blood pressure (hypotension)
• Elevated potassium levels
• Skin rash

Serious side effects requiring immediate medical attention:

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• Angioedema (swelling of face, lips, tongue, or throat)
• Severe kidney problems or kidney failure
• Dangerously high potassium levels (hyperkalemia)
• Severe low blood pressure with fainting
• Liver problems or jaundice

Warnings and precautions

• Pregnancy: Benazepril is contraindicated during pregnancy, especially in the second and third trimesters, as it can cause serious harm or death to the developing fetus. Women of childbearing age should use effective contraception.
• Kidney disease: Patients with existing kidney problems require careful monitoring, as ACE inhibitors can worsen kidney function in some cases. Regular blood tests to check kidney function are necessary.
• Hyperkalemia risk: The medication can increase potassium levels, which is particularly dangerous for patients with kidney disease, diabetes, or those taking potassium supplements or potassium-sparing diuretics.
• Angioedema history: Patients with a previous history of angioedema from any cause should not use benazepril, as they have an increased risk of developing this life-threatening condition.
• Surgery and anesthesia: Inform healthcare providers about benazepril use before any surgical procedures, as it may interact with anesthetics and cause severe low blood pressure.

Interactions

• Potassium supplements and salt substitutes: Can lead to dangerous elevations in blood potassium levels when combined with benazepril.
• Diuretics: May cause excessive blood pressure reduction, especially when starting treatment or increasing doses.
• NSAIDs (ibuprofen, naproxen): Can reduce the effectiveness of benazepril and increase the risk of kidney problems.
• Lithium: Benazepril can increase lithium levels in the blood, potentially leading to lithium toxicity.
• Diabetes medications: ACE inhibitors may enhance the blood sugar-lowering effects of diabetes drugs, increasing the risk of hypoglycemia.
• Other blood pressure medications: Combined use may cause additive blood pressure-lowering effects requiring dose adjustments.
• Aliskiren: Should not be used together in patients with diabetes or kidney disease due to increased risk of kidney problems and high potassium.
• Trimethoprim/sulfamethoxazole: May increase potassium levels when used with benazepril.

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Dosage

For hypertension in adults, the typical starting dose is 10 mg once daily, which may be increased to 20-40 mg daily based on blood pressure response. For heart failure, treatment usually begins with 2.5-5 mg twice daily, with gradual increases as tolerated up to 10 mg twice daily. Patients with kidney impairment may require lower starting doses and more frequent monitoring. Dosage should always be individualized and determined by a healthcare provider based on the patient’s specific condition, response to treatment, and other medical factors.

Sources: FDA DailyMed drug labels (public domain), BNF, WHO Essential Medicines List. This article is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider before starting or stopping any medication.

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