- A persistent dry cough, often worse at night, is the most common side effect of ACE inhibitor medications, affecting around 10% of people who take them, and up to 20% of women.
- The cough is caused by a build-up of bradykinin a chemical that ACE inhibitors prevent from breaking down, which irritates the airways and triggers a cough reflex.
- ACE inhibitors are highly effective cardiovascular medications with proven benefits for blood pressure, heart failure, and survival after heart attack. Do not stop taking them without speaking to your doctor first.
- Switching to an ARB (angiotensin receptor blocker) which works similarly but does not affect bradykinin, almost always resolves the cough completely, usually within weeks.
- If you have been coughing for months and are on an ACE inhibitor, mention it to your doctor. This is one of the most underdiagnosed and easily solved medication side effects in cardiology.
As a cardiologist, I frequently see patients who have been living with a persistent dry cough for months, sometimes longer. They have been to their GP, had chest X-rays, been tested for asthma, trialled reflux medication, and in recent years, tested repeatedly for COVID-19. The cough continues. It is often worse at night, disturbing sleep. It is dry, tickling, and relentless, and nobody has been able to explain it.
Then I ask one question: are you taking a blood pressure tablet that ends in “-pril”? Lisinopril, ramipril, perindopril, enalapril? The answer is yes. And the explanation, which should have been offered at the time of prescription, is that their cough is almost certainly a side effect of their ACE inhibitor medication. The fix is straightforward. A simple switch to a different class of medication resolves it, typically within a few weeks, and the patient wonders why nobody mentioned this sooner.
This article explains what ACE inhibitors are, why they cause a cough, and, most importantly, what you can do about it.
If you have been coughing for months and are taking an ACE inhibitor, please raise it with your doctor at your next appointment. This is one of the most common, most underdiagnosed, and most easily resolved medication side effects in cardiovascular medicine.
What Are ACE Inhibitors and Why Are They Prescribed?
ACE inhibitors angiotensin-converting enzyme inhibitors, are one of the most widely prescribed and most evidence-backed medication classes in cardiovascular medicine. They work by blocking an enzyme involved in the renin-angiotensin-aldosterone system a hormonal pathway that regulates blood pressure, fluid balance, and vascular tone. By inhibiting this enzyme, ACE inhibitors relax blood vessels, reduce fluid retention, and lower blood pressure.
Beyond blood pressure control, ACE inhibitors have demonstrated significant cardiovascular protection across a broad range of conditions. They improve survival and reduce the risk of major events in people with heart failure, coronary artery disease, and diabetes with kidney involvement. They are recommended as first-line therapy by every major cardiology guideline, including the European Society of Cardiology, the American Heart Association, and the Cardiac Society of Australia and New Zealand. In other words, if your doctor has prescribed you an ACE inhibitor, there is very good clinical reason for it.
This is important context before we discuss the cough, because the answer is never simply to stop taking the medication. It is to find an equally effective alternative that does not cause this side effect.
Why Do ACE Inhibitors Cause a Cough?
The ACE enzyme does not only act on the renin-angiotensin pathway, it is also responsible for breaking down a substance called bradykinin. Bradykinin is a chemical mediator involved in inflammation and vasodilation. When ACE inhibitors block the enzyme, bradykinin is no longer broken down as efficiently, and its levels in the body rise.
Elevated bradykinin accumulates in the airways, where it irritates the mucous membranes of the throat and bronchial tubes, triggering a persistent, dry, tickling cough reflex. Crucially, this has nothing to do with lung disease, infection, or reflux, it is a direct pharmacological consequence of the medication’s mechanism of action. This explains why the cough does not respond to cough suppressants, antihistamines, or reflux treatment, because none of those address the underlying cause.
The cough is often worse at night, when lying flat reduces mucociliary clearance and the irritation becomes more noticeable. It can be severe enough to disrupt sleep, cause social embarrassment, and significantly affect quality of life, and yet it is entirely reversible once the cause is identified and addressed.
Common ACE Inhibitors, Do You Recognise Yours?
ACE inhibitors all share the “-pril” suffix, which makes them easy to identify on a prescription or medication box. If your blood pressure or heart medication ends in “-pril”, it is an ACE inhibitor.
| Generic Name | Common Brand Names | Typical Use |
|---|---|---|
| Ramipril | Altace, Tritace | Blood pressure, heart failure, post-heart attack |
| Perindopril | Coversyl, Aceon | Blood pressure, coronary artery disease |
| Lisinopril | Prinivil, Zestril | Blood pressure, heart failure |
| Enalapril | Vasotec, Epaned | Blood pressure, heart failure |
| Quinapril | Accupril | Blood pressure, heart failure |
| Captopril | Capoten | Blood pressure, heart failure |
| Trandolapril | Mavik | Blood pressure, post-heart attack |
| Fosinopril | Monopril | Blood pressure, heart failure |
The Simple Solution, Switching to an ARB
Angiotensin receptor blockers (ARBs) work on the same hormonal pathway as ACE inhibitors, blocking the effects of angiotensin II on blood vessels, but through a different mechanism that does not involve bradykinin. Because ARBs do not affect bradykinin levels, they do not cause the cough. The cardiovascular benefits are comparable to ACE inhibitors across most indications, and switching from one to the other is a routine, well-established clinical manoeuvre.
When a patient switches from an ACE inhibitor to an ARB, the cough typically resolves within two to four weeks as bradykinin levels normalise. For many patients, the relief is dramatic, particularly those who have been coughing for months or years without understanding the cause. ARBs include medications such as candesartan, losartan, valsartan, irbesartan, and telmisartan, all ending in “-sartan”, which is their equivalent identifying suffix.
The decision to switch should always be made in consultation with your prescribing doctor, not because the switch itself is complex, but because your doctor will want to ensure the ARB is appropriate for your specific condition, confirm the correct dose, and arrange a follow-up to check your blood pressure and kidney function after the change.
- ACE inhibitors block the ACE enzyme, preventing both angiotensin II production AND bradykinin breakdown. The bradykinin build-up causes the cough.
- ARBs block the angiotensin II receptor directly, without affecting bradykinin at all. Same cardiovascular benefit, without the cough.
- Both classes are guideline-recommended first-line treatments. Switching is routine and well tolerated by the vast majority of patients.
- The cough typically resolves within 2 to 4 weeks of switching, though it can occasionally take up to 3 months to fully settle.
What If the Cough Persists After Switching?
In the majority of cases, switching to an ARB resolves the cough completely. If the cough persists beyond three months after stopping the ACE inhibitor, it is worth reassessing whether there is another contributing cause, particularly if the cough has any additional features such as productive sputum, breathlessness, or blood-stained mucus, which would always warrant further investigation regardless of medication history.
Other causes of a persistent dry cough worth considering include post-nasal drip from allergic rhinitis, gastro-oesophageal reflux (which can cause a chronic cough without prominent heartburn symptoms), cough-variant asthma, and in some cases medications other than ACE inhibitors, including certain eye drops containing beta-blockers that are absorbed systemically. Your doctor can help work through these possibilities systematically if the cough continues after the medication switch.
Should You Stop Your ACE Inhibitor Without Telling Your Doctor?
No, and this is important. ACE inhibitors are prescribed for good clinical reasons, and stopping them abruptly without a plan can lead to a rebound rise in blood pressure or, in people with heart failure, a deterioration in symptoms. The right approach is to raise the cough with your doctor, confirm that the ACE inhibitor is the likely cause, and arrange a supervised switch to an ARB with appropriate follow-up.
Many patients are reluctant to raise medication side effects because they do not want to seem difficult or ungrateful for their treatment. Please do not let that hesitation persist. This is a simple, well-recognised, and entirely solvable problem, and your doctor will be glad you mentioned it.
Heart Matters Resource
When in Doubt, Get Checked Out
If you have any symptom that is new, persistent, or unexplained, including a cough that won’t go away, it always deserves proper attention. Heart Matters has a dedicated resource covering the symptoms that should never be ignored.
Conclusion
The ACE inhibitor cough is one of the most common, most disruptive, and most underrecognised medication side effects in cardiovascular medicine. Patients cough for months, undergo unnecessary investigations, and try multiple remedies, when the answer is simply written on their prescription.
If you are taking a “-pril” medication and have developed a persistent dry cough, particularly one that is worse at night, please raise it with your doctor. The medication may well be the cause, a straightforward switch to an ARB is almost certainly available, and the cough should resolve within weeks. You do not need to simply put up with it.
ACE inhibitors are excellent medications that have helped millions of people with heart disease and high blood pressure. The goal is not to abandon them, it is to find you an equally effective alternative that lets you get a good night’s sleep.
