Benazepril

What is Benazepril?

Benazepril is a prescription medication belonging to a class of drugs called ACE (angiotensin-converting enzyme) inhibitors. It is primarily used to treat high blood pressure (hypertension) and certain heart conditions by relaxing blood vessels and reducing the workload on the heart. This medication helps prevent serious cardiovascular complications such as heart attacks, strokes, and kidney problems.

Uses

Benazepril is approved for several important medical conditions:

• High blood pressure (hypertension): The primary use, helping to lower blood pressure in adults and children over 6 years old
• Heart failure: Used as part of combination therapy to improve heart function and reduce symptoms
• Diabetic nephropathy: Helps protect kidney function in people with diabetes by reducing protein loss in urine
• Post-heart attack treatment: May be prescribed to improve survival and heart function following a myocardial infarction
• Chronic kidney disease: Used to slow the progression of kidney damage in certain patients

How it works

Benazepril works by blocking the action of angiotensin-converting enzyme (ACE), which is responsible for producing a hormone called angiotensin II. Angiotensin II normally causes blood vessels to narrow and promotes sodium retention, both of which increase blood pressure. By inhibiting ACE, benazepril allows blood vessels to relax and widen, while also reducing fluid retention, resulting in lower blood pressure and decreased strain on the heart.

Side effects

Common side effects include:

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

Serious side effects requiring immediate medical attention:

• Angioedema (swelling of face, lips, tongue, or throat)
• Severe allergic reactions
• Kidney function deterioration
• Severely low blood pressure with fainting
• Dangerously high potassium levels (hyperkalemia)

Warnings and precautions

• Pregnancy: Benazepril can cause serious harm to developing fetuses, particularly in the second and third trimesters, and should be discontinued immediately if pregnancy is detected
• Kidney disease: Patients with existing kidney problems require careful monitoring as ACE inhibitors can worsen kidney function in some cases
• Angioedema history: People who have previously experienced angioedema with any ACE inhibitor should not use benazepril due to increased risk of recurrence
• Dehydration: Patients who are dehydrated, on dialysis, or taking diuretics may experience dangerous drops in blood pressure
• Surgery: The medication may need to be temporarily discontinued before major surgery due to anesthesia interactions

Interactions

Benazepril can interact with numerous medications and supplements:

• Potassium supplements and salt substitutes: Can lead to dangerous increases in blood potassium levels
• Diuretics: May cause excessive blood pressure reduction, especially when starting treatment
• NSAIDs (ibuprofen, naproxen): Can reduce benazepril’s effectiveness and increase kidney damage risk
• Lithium: ACE inhibitors can increase lithium levels, potentially causing toxicity
• Diabetes medications: May enhance blood sugar-lowering effects, requiring dose adjustments
• Other blood pressure medications: Combined use requires careful monitoring to prevent excessive blood pressure reduction
• Aliskiren: Combination use is contraindicated in patients with diabetes or kidney disease
• Gold injections: Rare but serious reactions including facial flushing and low blood pressure can occur

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Dosage

Typical adult dosages for benazepril vary based on the condition being treated and individual patient factors. For hypertension, the usual starting dose is 10 mg once daily, which may be increased to 20-40 mg daily based on blood pressure response. In heart failure, lower starting doses of 5 mg once or twice daily are often used. Patients with kidney impairment may require dose reductions. The medication can be taken with or without food, but should be taken consistently at the same time each day. Dosage adjustments should always be made gradually under medical supervision, and patients should never stop taking benazepril suddenly without consulting their healthcare provider, as this can cause dangerous blood pressure spikes.

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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