Ace%2525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252520inhibitors

# ACE Inhibitors ## Overview Angiotensin-converting enzyme (ACE) inhibitors are a class of medications used to treat hypertension and heart failure. They work by blocking the conversion of angiotensin I to angiotensin II, a potent vasoconstrictor, leading to vasodilation and reduced blood pressure. ## Primary Indications * Hypertension * Heart failure (systolic dysfunction) * Post-myocardial infarction (to improve survival) * Diabetic nephropathy (in patients with diabetes and hypertension or proteinuria) ## Adult Dosing Dosing varies by specific agent and indication. Common starting doses for hypertension include: * **Benazepril:** 10 mg orally once daily. * **Captopril:** 25 mg orally twice daily. * **Enalapril:** 5 mg orally once daily. * **Fosinopril:** 10 mg orally once daily. * **Lisinopril:** 10 mg orally once daily. * **Moexipril:** 7.5 mg orally once daily. * **Perindopril:** 5 mg orally once daily. * **Quinapril:** 10 mg orally once daily. * **Ramipril:** 2.5 mg orally once daily. * **Trandolapril:** 1 mg orally once daily. **Maximum doses** are typically higher and depend on the specific agent and indication (e.g., lisinopril up to 40 mg/day for hypertension, higher for heart failure). Specific titration guidelines should be followed based on patient response and tolerability. ## Pediatric Dosing ACE inhibitors are generally not first-line agents for hypertension in children. Dosing is highly variable and depends on the specific agent, age, weight, and indication. Examples: * **Enalapril:** 0.07-0.1 mg/kg orally once daily, may increase to 0.21 mg/kg/day. * **Lisinopril:** 0.07 mg/kg orally once daily, may increase to 0.21 mg/kg/day. Consult pediatric-specific resources or local protocols for precise dosing. ## Dose Adjustments * **Renal Impairment:** Dose reduction is often necessary, especially with significant renal impairment. Monitor potassium and creatinine closely. * **Hepatic Impairment:** Some agents may require dose adjustment, particularly prodrugs like enalapril and ramipril. ## Contraindications * History of angioedema related to prior ACE inhibitor therapy. * Concomitant use with aliskiren in patients with diabetes. * Pregnancy (especially second and third trimesters). * Known hypersensitivity to the specific ACE inhibitor. ## Adverse Effects * **Angioedema:** Rare but life-threatening swelling of the face, lips, tongue, throat, or intestines. * **Cough:** Dry, persistent cough is common. * **Hyperkalemia:** Elevated potassium levels, especially in patients with renal impairment or those taking potassium-sparing diuretics or potassium supplements. * **Hypotension:** Particularly after the first dose or in volume-depleted patients. * **Renal dysfunction:** Can worsen pre-existing renal impairment. * **Dizziness, fatigue.** ## Key Drug Interactions * **Potassium-sparing diuretics (e.g., spironolactone, amiloride), potassium supplements, salt substitutes:** Increased risk of hyperkalemia. * **NSAIDs (e.g., ibuprofen, naproxen):** May reduce antihypertensive efficacy and increase risk of renal dysfunction. * **Diuretics (especially thiazides and loop diuretics):** Increased risk of hypotension. * **Aliskiren:** Increased risk of hyperkalemia, hypotension, and renal impairment. Avoid concomitant use, especially in patients with diabetes. * **ARBs:** Increased risk of angioedema, hyperkalemia, and renal dysfunction. Generally not recommended together. * **Lithium:** ACE inhibitors can reduce lithium clearance, increasing lithium toxicity risk. ## Monitoring * **Blood pressure:** Monitor regularly to assess efficacy and guide titration. * **Serum creatinine and potassium:** Monitor at baseline, within 1-2 weeks of initiation or dose increase, and periodically thereafter, especially in patients with risk factors for renal impairment or hyperkalemia. * **Renal function:** Assess for signs of worsening renal function. * **Signs and symptoms of angioedema and hypersensitivity reactions.** ## Clinical Pearls * Start at a low dose and titrate slowly to minimize hypotension and other side effects. * The first dose can cause significant hypotension; monitor closely, especially in volume-depleted patients or those on diuretics. * Cough is a common, dose-dependent side effect and may necessitate discontinuation and switching to an ARB. * ACE inhibitors are generally considered safe and effective in diabetic patients for nephroprotection. * Discontinue ACE inhibitors immediately if angioedema occurs and never re-challenge the patient. *** **Disclaimer:** This information is intended for educational purposes only and does not substitute for professional medical advice. Always consult the most current prescribing information and guidelines for specific drug use, dosing, and safety information. Verify all details with the latest official drug product labeling or a qualified healthcare professional.