Does Losartan Cause Chronic Cough?
Losartan, an angiotensin II receptor blocker (ARB) used for high blood pressure, rarely causes chronic cough. Clinical trials and post-marketing data show cough incidence at 1-2% with losartan, far lower than ACE inhibitors like lisinopril, where cough affects 5-20% of patients.[1][2] The mechanism involves ARBs avoiding bradykinin buildup, which triggers cough in ACE inhibitors by inhibiting its breakdown.[3]
Why Is Cough More Common with ACE Inhibitors?
ACE inhibitors block angiotensin-converting enzyme, accumulating bradykinin and substance P in the lungs, irritating airways and causing dry, persistent cough—often starting weeks to months after initiation. ARBs like losartan block angiotensin II receptors directly, sparing bradykinin pathways, so cough risk drops significantly.[3][4] Switching from an ACE inhibitor to losartan resolves cough in most cases within 1-4 weeks.[2]
When Might Losartan Still Cause Cough?
Individual cases occur, possibly from hypersensitivity, upper respiratory issues, or concurrent medications. Reports describe non-productive cough resolving after stopping losartan, but it's not dose-dependent and affects <1% in long-term studies.[1][5] Risk factors include female sex, smoking, or asthma history, overlapping with ACE inhibitor sensitivities.[4]
What Do Patients Report and How Common Is It?
User forums and FDA adverse event databases log occasional losartan-related cough complaints, but controlled studies confirm it's uncommon—e.g., 1.1% in the LIFE trial versus 3.4% placebo.[2][6] Unlike ACE inhibitors, losartan cough rarely leads to discontinuation (0.5-1% rate).[1]
What If You Develop Cough on Losartan?
Consult a doctor before stopping; they may switch to another ARB (e.g., valsartan, similar low risk) or check for non-drug causes like GERD or allergies. No specific diagnostic test exists—diagnosis is by exclusion and resolution on discontinuation.[4][5]
Alternatives for Cough-Prone Patients
| Drug Class | Cough Risk | Examples |
|------------|------------|----------|
| ARBs | Low (1-2%) | Losartan, valsartan, olmesartan |
| Calcium Channel Blockers | Very low (<1%) | Amlodipine |
| Beta Blockers | Low | Metoprolol |
| Diuretics | Very low | Hydrochlorothiazide |
ARBs remain first-line for ACE-intolerant patients.[2][7]
Sources:
[1] Losartan Prescribing Information, Merck (FDA label). https://www.accessdata.fda.gov/drugsatfda_docs/label/2010/020386s060lbl.pdf
[2] LIFE Trial, Lancet 2002. https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(02)07713-9/fulltext
[3] NEJM Review on ACEI/ARB Cough, 2004. https://www.nejm.org/doi/full/10.1056/NEJMra030201
[4] American Heart Association Guidelines, 2017. https://www.ahajournals.org/doi/10.1161/HYP.0000000000000065
[5] FAERS Database Query (Losartan cough reports). https://www.fda.gov/drugs/questions-and-answers-fdas-adverse-event-reporting-system-faers/fda-adverse-event-reporting-system-faers-public-dashboard
[6] Drugs.com User Reviews. https://www.drugs.com/comments/losartan/
[7] UpToDate: ARB Overview. https://www.uptodate.com/contents/angiotensin-ii-receptor-blockers-in-the-treatment-of-hypertension