Lisinopril-induced cough management
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Lisinopril-Induced Cough: Incidence and Patient Risk Factors
Lisinopril, an angiotensin-converting enzyme (ACE) inhibitor, is well known to cause a persistent dry cough in some patients. The incidence of cough with lisinopril varies across studies, with reported rates ranging from about 8.8% to 68.9% depending on the population and study design Benz1997Nazir2016. The cough typically develops within days to weeks of starting therapy and is not dose-related Singh1998Nazir2016. Women and nonsmokers are at higher risk of developing lisinopril-induced cough, with women experiencing this side effect up to three times more often than men Singh1998Os1994.
Mechanism of Lisinopril-Induced Cough
The cough is believed to be caused by the accumulation of bradykinin and substance P, which are normally broken down by ACE. Lisinopril increases the levels of these mediators, leading to stimulation of the cough reflex Nazir2016Cinelli2015. Experimental studies in animals confirm that lisinopril, but not angiotensin II receptor blockers (ARBs) like losartan, increases cough frequency, supporting the role of bradykinin and substance P in this side effect Cinelli2015Mutolo2013.
Management Strategies: Switching to ARBs
The most effective management for lisinopril-induced cough is discontinuation of the drug. Studies consistently show that switching from lisinopril to an ARB such as losartan, valsartan, or telmisartan significantly reduces the incidence of cough to levels similar to placebo or thiazide diuretics Benz1997Paster1998Lacourciére1994+2 MORE. For example, the incidence of cough with losartan or valsartan in patients with a history of ACE inhibitor-induced cough is about 15–36%, compared to 60–97% with lisinopril Benz1997Paster1998Lacourciére1994+2 MORE. Blood pressure control remains comparable when switching from lisinopril to an ARB .
Alternative Approaches and Symptomatic Relief
In rare cases where discontinuation of lisinopril is not possible, symptomatic relief may be attempted. One study found that indomethacin, a nonsteroidal anti-inflammatory drug, provided complete or partial relief of cough in some patients . However, this approach is less commonly used due to potential side effects of NSAIDs.
Resolution of Cough After Stopping Lisinopril
The cough usually resolves within 1 to 4 weeks after stopping lisinopril, though in some cases it may take longer . Patients should be reassured that the cough is reversible and not associated with long-term harm.
Conclusion
Lisinopril-induced cough is a common and sometimes troublesome side effect, especially in women and nonsmokers. The most effective management is to discontinue lisinopril and switch to an ARB, which provides similar blood pressure control with a much lower risk of cough. Symptomatic treatments like indomethacin may help in select cases, but are not first-line. The cough typically resolves within weeks of stopping the ACE inhibitor.
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