Enalapril

What is Enalapril?

Enalapril is a prescription medication that belongs to a class of drugs called ACE inhibitors (angiotensin-converting enzyme inhibitors). It is primarily used to treat high blood pressure and heart failure by helping blood vessels relax and widen, which reduces the workload on the heart. Enalapril has been widely prescribed since the 1980s and is considered a first-line treatment for several cardiovascular conditions.

Uses

Enalapril is approved for several important medical conditions:

• High blood pressure (hypertension): Used alone or in combination with other medications to lower blood pressure and reduce the risk of heart attack, stroke, and kidney problems
• Heart failure: Helps improve symptoms and survival in patients with reduced heart function by decreasing the heart’s workload
• Left ventricular dysfunction: Prescribed for patients who have weakened heart muscle function, often following a heart attack
• Diabetic kidney disease: May help protect kidney function in people with diabetes by reducing protein loss in urine
• Prevention of cardiovascular events: Used in high-risk patients to reduce the likelihood of heart attack, stroke, and cardiovascular death

How it works

Enalapril works by blocking the angiotensin-converting enzyme, which is responsible for producing a hormone called angiotensin II. Angiotensin II normally causes blood vessels to narrow and stimulates the release of another hormone that causes the body to retain salt and water. By blocking this process, enalapril allows blood vessels to relax and widen, while also helping the kidneys eliminate excess fluid, ultimately lowering blood pressure and reducing strain on the heart.

Side effects

Common side effects include:

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• Dry cough (occurs in about 10-15% of patients)
• Dizziness or lightheadedness
• Fatigue or weakness
• Headache
• Nausea
• Low blood pressure
• Elevated potassium levels
• Skin rash

Serious side effects to watch for:

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

Warnings and precautions

• Pregnancy: Enalapril is contraindicated during pregnancy, especially in the second and third trimesters, as it can cause serious harm to the developing fetus including kidney problems and death
• Kidney disease: Patients with existing kidney problems require careful monitoring and dose adjustments, as ACE inhibitors can worsen kidney function in some cases
• High potassium levels: Should be used with caution in patients prone to elevated potassium, including those with kidney disease or diabetes
• Surgery and anesthesia: May need to be temporarily discontinued before major surgery due to risk of excessive blood pressure lowering
• Dehydration: Patients who are volume-depleted or dehydrated are at higher risk for severe blood pressure drops when starting treatment

Interactions

Enalapril can interact with several medications and supplements:

• Potassium supplements and salt substitutes: May cause dangerously high potassium levels when combined with ACE inhibitors
• Diuretics: Can enhance blood pressure-lowering effects, potentially causing excessive drops in blood pressure
• Nonsteroidal anti-inflammatory drugs (NSAIDs): May reduce the effectiveness of enalapril and increase risk of kidney problems
• Lithium: ACE inhibitors can increase lithium levels in the blood, leading to toxicity
• Diabetes medications: May enhance blood sugar-lowering effects, requiring monitoring for hypoglycemia
• Other blood pressure medications: Combined use may cause additive blood pressure-lowering effects
• Gold injections: Rare reactions including facial flushing and low blood pressure have been reported
• Aliskiren: Should not be used together in patients with diabetes or kidney disease

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Dosage

Typical adult dosages vary based on the condition being treated. For high blood pressure, the usual starting dose is 5-10 mg once or twice daily, with maintenance doses ranging from 10-40 mg daily. For heart failure, treatment typically begins with 2.5 mg twice daily, gradually increased to 10-20 mg twice daily as tolerated. Patients with kidney problems may require lower starting doses and more gradual dose increases. Dosage should always be individualized and determined by a healthcare provider based on patient response, kidney function, 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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