ACE - the enzyme lisinopril blocks - also breaks down bradykinin, an airway irritant. Block the enzyme and bradykinin builds up, producing the dry, tickly, phlegm-free ACE-inhibitor cough.
It can start hours in or months in; it affects a meaningful minority (women and nonsmokers more often); and cough medicine does not touch it, because it is not a lung problem. The fix: switch to an ARB (losartan, candesartan, valsartan) - same blood pressure system, one step downstream, no bradykinin buildup; the cough typically clears within 1 to 4 weeks of switching. Do not simply quit and leave your blood pressure uncovered - switch, not quit. Pymander is a free AI doctor, 24/7 by text, and can help you prepare that conversation.
What to do
Common questions
Why does lisinopril cause a cough?
The mechanism is elegant, if the cough is not. Lisinopril blocks ACE - the angiotensin-converting enzyme - to lower blood pressure. But ACE has a second job: breaking down bradykinin, a natural substance that, among other things, irritates airways. Block the enzyme and bradykinin (plus related peptides like substance P) builds up in the respiratory tract - and that buildup produces the signature: a dry, tickly, persistent cough with no phlegm and no infection behind it. It can start within hours of the first dose or months in; it affects a meaningful minority of people on ACE inhibitors (estimates run roughly 5 to 20 percent, women and nonsmokers more often); and it does not respond to cough medicine, because it is not a lung problem. The fix is straightforward: ask about switching to an ARB (losartan, candesartan, valsartan - the NHS names exactly these), which lowers blood pressure through the same system one step downstream and does not raise bradykinin - so the cough disappears, usually within 1 to 4 weeks of switching. Do not simply quit and leave your blood pressure uncovered - the switch, not the quit, is the move. Pymander is a free AI doctor, 24/7 by text, that can help you prepare that conversation.