Enalapril Drug Profile

What is Enalapril?

Enalapril is an angiotensin-converting enzyme (ACE) inhibitor medication used primarily to treat high blood pressure and heart failure. This prescription medication belongs to a class of drugs that work by relaxing blood vessels and reducing the workload on the heart. Enalapril is available in tablet form and is typically taken once or twice daily as directed by a healthcare provider.

Uses

Enalapril has several medically approved uses:

• Hypertension (High Blood Pressure): Reduces blood pressure by relaxing blood vessels, helping to prevent complications like stroke, heart attack, and kidney problems
• Heart Failure: Improves symptoms and survival in patients with reduced heart function by decreasing the heart’s workload
• Left Ventricular Dysfunction: Used in patients with weakened heart muscle following heart attack to prevent progression to heart failure
• Diabetic Nephropathy: Helps protect kidney function in diabetic patients by reducing protein loss in urine
• Cardiovascular Risk Reduction: May be prescribed to reduce the risk of heart attack and stroke in certain high-risk patients

How it works

Enalapril blocks the action of angiotensin-converting enzyme (ACE), which normally converts angiotensin I to angiotensin II, a powerful substance that narrows blood vessels and increases blood pressure. By inhibiting this enzyme, enalapril prevents the formation of angiotensin II, allowing blood vessels to remain relaxed and widened. This mechanism also reduces the release of aldosterone, a hormone that causes the body to retain salt and water, further helping to lower blood pressure and reduce strain on the heart.

Side effects

Common side effects include:

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• Dry, persistent cough
• Dizziness or lightheadedness
• Fatigue or weakness
• Headache
• Nausea
• Low blood pressure
• Elevated potassium levels
• Kidney function changes

Serious side effects requiring immediate medical attention:

• 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
• Signs of liver problems (yellowing of skin or eyes)

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, low blood pressure, and death
• Kidney Disease: Patients with existing kidney problems require careful monitoring as enalapril can worsen kidney function, particularly in those with renal artery stenosis
• Angioedema History: Individuals with a previous history of angioedema should not take enalapril due to increased risk of recurrence
• Electrolyte Monitoring: Regular monitoring of potassium levels and kidney function is essential, especially in elderly patients or those with diabetes
• Surgery/Anesthesia: Inform healthcare providers about enalapril use before any surgical procedures as it may interact with anesthesia

Interactions

Enalapril has several important drug interactions:

• Potassium supplements and salt substitutes: Can cause dangerously high potassium levels when combined with enalapril
• Nonsteroidal anti-inflammatory drugs (NSAIDs): May reduce enalapril’s effectiveness and increase kidney damage risk
• Lithium: Enalapril can increase lithium levels, potentially leading to toxicity
• Diuretics: May cause excessive blood pressure reduction, especially when starting treatment
• Diabetes medications: ACE inhibitors may enhance blood sugar-lowering effects, requiring dosage adjustments
• Other blood pressure medications: Can cause additive blood pressure lowering effects
• Potassium-sparing diuretics: Increases risk of hyperkalemia when used together
• Gold injections: Rare but serious reactions have been reported when used with ACE inhibitors

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Dosage

Typical adult dosing ranges vary based on the condition being treated. For hypertension, the usual starting dose is 2.5-5 mg once daily, which may be increased gradually to a maximum of 40 mg daily, often divided into two doses. For heart failure, treatment typically begins with 2.5 mg twice daily, with careful dose titration up to 10-20 mg twice daily as tolerated. Patients with kidney impairment or those taking diuretics may require lower starting doses. 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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