Cough as a side effect of antihypertensive medications
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ACE Inhibitors and Cough: Prevalence and Mechanism
Cough is a well-recognized side effect of angiotensin-converting enzyme (ACE) inhibitors, a common class of antihypertensive medications. Studies consistently report that the incidence of cough among patients taking ACE inhibitors ranges from about 5% to 20%, with some studies noting even higher rates depending on the patient population and setting 1236+4 MORE. The cough is typically dry, nonproductive, and often worse at night, leading to sleep disturbances in some patients 12. The underlying mechanism is believed to involve the accumulation of inflammatory mediators such as bradykinin and substance P, which are normally broken down by ACE. When ACE is inhibited, these substances can build up and trigger cough reflexes 129.
Patient Characteristics and Risk Factors
Women are more likely than men to develop ACE inhibitor-induced cough, and this side effect can be severe enough to cause complications such as urinary stress incontinence or even prolapse in rare cases 2610. The onset of cough can occur weeks to months after starting therapy, and patients often do not immediately associate the cough with their medication 126. In some studies, the incidence of cough was higher in patients with congestive heart failure compared to those with hypertension alone .
Comparison with Other Antihypertensive Medications
ACE inhibitors are more likely to cause cough than other classes of antihypertensive drugs, such as angiotensin receptor blockers (ARBs) or calcium channel blockers (CCBs) 48. For example, in a direct comparison, the incidence of cough with the ACE inhibitor lisinopril was 60%, compared to 15.6% with the ARB telmisartan and 9.7% with placebo . Systematic reviews and meta-analyses confirm that all ACE inhibitors carry a similar risk of cough, which is significantly higher than with ARBs or CCBs .
Management and Resolution
The cough usually resolves within days to weeks after discontinuing the ACE inhibitor 126. Switching to another ACE inhibitor is generally not effective, as the cough often recurs with different agents in the same class 1279. Instead, switching to an ARB or another class of antihypertensive medication is recommended for patients who develop this side effect 489. Prompt recognition of ACE inhibitor-induced cough can prevent unnecessary diagnostic testing and improve patient comfort 19.
Clinical Implications
Cough is the most common side effect leading to discontinuation of ACE inhibitors, especially among women 610. In patients with diabetes and hypertension, cough was also the most frequently reported side effect, particularly when ACE inhibitors were combined with thiazide diuretics . Awareness of this side effect is important for clinicians to avoid unnecessary investigations and to provide appropriate alternative therapies when needed 139.
Conclusion
Cough is a common and sometimes severe side effect of ACE inhibitor antihypertensive therapy, affecting up to one in five patients. It is more prevalent in women and can significantly impact quality of life. The cough typically resolves after stopping the medication, and alternative antihypertensive agents such as ARBs or CCBs should be considered for affected patients. Recognizing this side effect early can help avoid unnecessary tests and improve patient care 1234+6 MORE.
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