For a patient with ACE‑inhibitor–induced cough and angina, should I replace lisinopril with losartan and use amlodipine (Norvasc) for angina?

Replace Lisinopril with Losartan and Add Amlodipine (Norvasc)

Yes, you should switch lisinopril to losartan for the ACE-inhibitor–induced cough and use amlodipine (Norvasc) for angina management—this dual approach addresses both problems with strong evidence-based support. 1

Managing the ACE-Inhibitor Cough

The ACCP guidelines provide Grade A evidence (good quality, substantial benefit) that when persistent or intolerable ACE inhibitor-induced cough occurs, therapy should be switched to an ARB, with losartan specifically demonstrating a cough incidence similar to placebo or hydrochlorothiazide rather than ACE inhibitors 1.

Key Evidence for Losartan Switch:

• Controlled trials show losartan causes cough in only 17-29% of patients with prior ACE-inhibitor cough, compared to 62-72% who recough with lisinopril rechallenge 2, 3
• The mechanism is clear: ARBs don't inhibit ACE, so they don't elevate bradykinin and substance P levels that trigger the cough reflex 1
• In elderly hypertensive patients with confirmed ACE-inhibitor cough, losartan (18% cough rate) performed similarly to the diuretic metolazone (21%) and dramatically better than lisinopril (97%) 4

Important Caveats:

• Wait 1-4 weeks after stopping lisinopril to confirm cough resolution—occasionally it takes up to 3 months in some patients 1
• Some patients (approximately 29% in one study) may still experience cough with losartan due to "carry-over" effects if switched too quickly, particularly if they had severe ACE-inhibitor cough 5
• The FDA label confirms rare cases of cough with losartan in post-marketing surveillance, but incidence remains far lower than ACE inhibitors 2

Managing the Angina

Amlodipine is FDA-approved specifically for chronic stable angina and can be used alone or with other antianginal agents 6. This makes it an ideal choice for your patient.

Why Amlodipine Works Here:

• Direct indication for symptomatic treatment of chronic stable angina 6
• Interestingly, amlodipine itself has been studied as a cough-suppressing agent in patients who must continue ACE inhibitors (Grade B recommendation), though this is not your primary indication 1
• In the ERICA trial, amlodipine 10 mg daily effectively reduced angina episodes in patients with refractory symptoms 7

The Combined Strategy

This approach elegantly solves both problems:

1. Losartan replaces lisinopril's cardiovascular protective effects without the cough mechanism (no bradykinin elevation)
2. Amlodipine directly treats the angina through coronary vasodilation
3. Both drugs can be safely combined and have complementary mechanisms

Practical Implementation:

• Stop lisinopril immediately (Grade B: only uniformly effective treatment for ACE-inhibitor cough) 1
• Start losartan 50 mg once daily; can titrate to 100 mg if blood pressure control inadequate 8
• Start amlodipine at appropriate dose for angina (typically 5-10 mg daily) 6
• Reassess cough in 1-4 weeks; if it persists beyond this timeframe, investigate other causes 1

Common Pitfall to Avoid:

Don't assume all cough with losartan is drug-induced—if cough persists after the 1-4 week washout period, you're likely dealing with a different etiology (post-nasal drip, GERD, asthma, etc.) rather than medication effect 5. The evidence shows 71-83% of patients with ACE-inhibitor cough will NOT experience cough with losartan 3.

Monitoring:

• Watch for the 7.5% incidence of peripheral edema with amlodipine (though lower than some reports) 9
• Losartan is generally well-tolerated with adverse event rates similar to placebo (2.3% discontinuation vs 3.7% for placebo) 2
• Both drugs maintain similar antihypertensive efficacy to lisinopril 9, 8