What alternative antihypertensive medications can be used instead of lisinopril (ACE inhibitor) and losartan (angiotensin receptor blocker)?

Alternative Medications for Lisinopril and Losartan

If you need alternatives to both lisinopril (ACE inhibitor) and losartan (ARB), the primary options are calcium channel blockers (CCBs), thiazide/thiazide-like diuretics, or beta-blockers, with the specific choice depending on your clinical indication and patient characteristics.

Understanding Why You Need Alternatives

The reason for switching matters significantly:

If Due to Side Effects

For ACE inhibitor cough (occurs in ~10% of patients): Switch to an ARB like candesartan or valsartan 1. The cough typically resolves within 1-2 weeks of stopping the ACE inhibitor and should not recur with ARB therapy 1.

For angioedema (rare but life-threatening): This is more complex. If angioedema occurred with an ACE inhibitor, extreme caution is required with ARBs as cross-reactivity can occur 1, 2. In this scenario, you must avoid all renin-angiotensin system blockers and use alternative drug classes entirely.

If Both ACE Inhibitors AND ARBs Have Failed or Are Contraindicated

This requires moving to different drug classes based on your clinical indication:

Recommended Alternatives by Indication

For Hypertension

First-line alternatives include:

1. Calcium Channel Blockers (CCBs) - specifically long-acting dihydropyridines 3, 4, 3:

   • Amlodipine 5-10 mg once daily
   • Nifedipine extended-release
   • These are particularly effective in Black patients and elderly individuals 3

2. Thiazide-like diuretics 3, 5:

   • Chlorthalidone 12.5-25 mg once daily (preferred over hydrochlorothiazide)
   • Indapamide 2.5 mg once daily
   • These provide superior cardiovascular protection compared to thiazide-type diuretics 5

3. Beta-blockers (for patients <60 years) 4:

   • Metoprolol succinate 25-200 mg once daily
   • Carvedilol 3.125-25 mg twice daily
   • Bisoprolol 1.25-10 mg once daily
   • Note: Beta-blockers are NOT recommended as first-line for uncomplicated hypertension in patients ≥60 years 4

The 2020 ISH and 2024 ESC guidelines recommend starting with combination therapy rather than monotherapy for most hypertensive patients 3, 6. If you cannot use ACE inhibitors or ARBs, start with:

• CCB + thiazide-like diuretic combination 3

For Heart Failure with Reduced Ejection Fraction

This is more challenging since ACE inhibitors and ARBs are cornerstone therapies. Alternative options include:

1. Hydralazine + Isosorbide Dinitrate combination 1:

   • This is specifically recommended for patients who cannot tolerate ACE inhibitors or ARBs due to hypotension, renal insufficiency, or drug intolerance 1
   • Particularly beneficial in Black patients with heart failure

2. Beta-blockers (essential in heart failure) 1:

   • Carvedilol 3.125 mg twice daily, titrate to 25 mg twice daily
   • Metoprolol succinate 12.5-25 mg once daily, titrate to 200 mg once daily
   • Bisoprolol 1.25 mg once daily, titrate to 10 mg once daily

3. Aldosterone antagonists 1:

   • Spironolactone 12.5-25 mg once daily (maximum 25-50 mg)
   • Eplerenone 25 mg once daily (maximum 50 mg)

Critical caveat: The routine combined use of ACE inhibitor, ARB, AND aldosterone antagonist is NOT recommended due to increased risks of renal dysfunction and hyperkalemia 1.

For Diabetic Nephropathy

This is the most problematic scenario because ACE inhibitors and ARBs are specifically indicated to slow progression of diabetic kidney disease 7, 8. If you absolutely cannot use these:

1. Strict blood pressure control with other agents becomes paramount 7:

   • Target BP <130/80 mmHg
   • Use CCBs + thiazide-like diuretics

2. Non-dihydropyridine CCBs (diltiazem, verapamil) may provide some proteinuria reduction, though evidence is weaker than for ACE inhibitors/ARBs

Important: There is no equivalent alternative that provides the same renal protection as ACE inhibitors/ARBs in diabetic nephropathy 7, 8. The focus shifts to aggressive BP control and glycemic management.

For Post-Myocardial Infarction with LV Dysfunction

Beta-blockers become the primary alternative 9:

• Carvedilol, metoprolol succinate, or bisoprolol
• Should be initiated as soon as hemodynamically stable post-MI

Aldosterone antagonists also have proven benefit post-MI with LV dysfunction 1.

Practical Algorithm for Choosing Alternatives

Step 1: Identify why ACE inhibitor/ARB cannot be used:

• Cough only → Switch to ARB
• Angioedema → Avoid all RAS blockers, proceed to Step 2
• Hyperkalemia/renal dysfunction → Consider lower doses or proceed to Step 2
• Both classes failed to control BP → Add agents from Step 2

Step 2: Select based on primary indication:

• Hypertension alone: CCB + thiazide-like diuretic
• Heart failure: Beta-blocker + hydralazine/nitrate + aldosterone antagonist
• Diabetic nephropathy: CCB + thiazide-like diuretic (accept less renal protection)
• Post-MI: Beta-blocker + aldosterone antagonist

Step 3: Consider patient-specific factors:

• Black patients: Prefer CCBs and diuretics over beta-blockers 3, 4, 3
• Elderly/frail: Start with lower doses, consider monotherapy initially 3
• Diabetes: Avoid high-dose thiazide diuretics (can worsen glycemic control)

Common Pitfalls to Avoid

1. Do not assume ARBs are safe after ACE inhibitor-induced angioedema - cross-reactivity occurs in some patients 1, 2, 9

2. Do not use beta-blockers as first-line in elderly patients (≥60 years) with uncomplicated hypertension - they are less effective than other classes 4

3. Do not combine non-dihydropyridine CCBs (diltiazem, verapamil) with beta-blockers - risk of excessive bradycardia and heart block 4

4. Monitor potassium closely when using aldosterone antagonists, especially with any degree of renal impairment 1, 5

5. In heart failure, hydralazine must be combined with a beta-blocker and loop diuretic to prevent reflex tachycardia and fluid retention 5