Naprilene (Enalapril Maleate)

• Naprilene, an ACE inhibitor, is employed in several cardiovascular conditions where the renin‑angiotensin system contributes to disease progression.
• Hypertension: lowers systolic and diastolic pressure, reducing risk of stroke and heart attack.
• Heart failure: improves symptoms and survival by decreasing afterload.
• Asymptomatic left ventricular dysfunction: slows progression to overt heart failure.
• Post‑myocardial infarction: reduces mortality and reinfarction rates.

• Enalapril is converted in vivo to enalaprilat, which binds to the active site of angiotensin‑converting enzyme (ACE). This inhibition prevents the conversion of angiotensin I to the potent vasoconstrictor angiotensin II and reduces aldosterone secretion, leading to vasodilation, decreased peripheral resistance, and lower blood pressure.

Adverse reactions may vary in frequency and severity.

Common Side Effects

• Cough: dry, persistent throat irritation.
• Dizziness or light‑headedness, especially after the first dose.
• Headache: mild to moderate intensity.
• Fatigue: general feeling of tiredness.
• Hypotension: especially in volume‑depleted patients.

Serious or Rare Side Effects

• Angioedema: swelling of face, lips, tongue, or airway.
• Hyperkalemia: elevated serum potassium levels.
• Acute renal impairment: sudden decrease in kidney function.
• Neutropenia or agranulocytosis: marked reduction in white blood cells.
• Hepatic dysfunction: abnormal liver enzyme elevations.

• Before initiating therapy, clinicians should assess relevant clinical factors and monitor patients during treatment.
• Monitor blood pressure: check regularly to avoid excessive hypotension.
• Assess renal function: obtain baseline creatinine and repeat as needed.
• Check serum potassium: especially when combined with potassium‑sparing agents.
• Avoid use in pregnancy: contraindicated due to fetal toxicity (Category D).
• Use caution in aortic stenosis: may precipitate severe hypotension.
• Store at below 25°C: keep in the original pack, protect from moisture.

Enalapril may interact with several drug classes, requiring attention to avoid reduced efficacy or increased toxicity.

Major Interactions (Avoid)

• Aliskiren (in diabetic patients): heightened risk of hypotension and renal dysfunction.
• Potassium‑sparing diuretics (e.g., spironolactone): may cause dangerous hyperkalemia.
• High‑dose NSAIDs: can blunt antihypertensive effect and impair renal function.

Moderate Interactions (Monitor Closely)

• Thiazide diuretics: additive blood‑pressure lowering effect.
• Lithium: increased lithium concentrations, risk of toxicity.
• Concurrent ACE inhibitors or ARBs: additive renin‑angiotensin blockade, avoid combined use.