When a nagging cough shows up after you start a new prescription, the medicine is often the reason, and one family of blood pressure pills accounts for most of these cases. The cough these pills cause is usually dry and tickly, a side effect that is annoying rather than dangerous. A handful of other medicines cause coughing in different ways, from irritating the throat to, rarely, damaging the lungs, so the kind of cough matters as much as the medicine.
Why ACE Inhibitor Blood Pressure Pills Cause a Dry Cough
ACE inhibitors are widely used blood pressure and heart pills whose names end in -pril, such as lisinopril, ramipril and enalapril. About one in five people who take them stops because of side effects, and chronic cough is the main reason.1PubMed Central. Angiotensin-Converting Enzyme Inhibitors Induce Cough. The rate varies between groups. In one group of Korean patients with high blood pressure, 4 in 10 developed a cough, a higher rate than usually reported in people of European descent.2Korean Circulation Journal. Risk factors of Angiotensin-Converting Enzyme Inhibitor-Induced Cough in Patients with Hypertension Women in that group were nearly three times as likely as men to get it.3Korean Circulation Journal. Risk factors of Angiotensin-Converting Enzyme Inhibitor-Induced Cough in Patients with Hypertension
The enzyme these pills block normally breaks down bradykinin, a body chemical that strongly triggers coughing.4PubMed Central. Breathtaking TRP Channels: TRPA1 and TRPV1 in Airway Chemosensation and Reflex Control With the enzyme blocked, bradykinin builds up in the airways and keeps the cough reflex switched on.5PubMed Central. Breathtaking TRP Channels: TRPA1 and TRPV1 in Airway Chemosensation and Reflex Control Experts still debate the full mechanism, and some -pril drugs may cause more cough than others.6PubMed Central. Angiotensin-Converting Enzyme Inhibitors Induce Cough.7PubMed. Pathophysiology of cough with angiotensin-converting enzyme inhibitors: How to explain within-class differences?
The cough is usually dry, with no mucus, and often feels like a tickle or scratch in the throat. It can come in fits, get worse when you lie down or talk, and break up your sleep. It is not a sign of lung damage or infection.
Timing trips people up. The cough can start within days of the first pill or only after months, and it doesn’t need a dose increase to appear. Because nothing about the pill has changed when the cough begins, people tend to blame a cold, an allergy or dry air, sometimes for a long time. A better question is whether the cough started after you began the pill, however long ago, and has simply never gone away.
Ordinary remedies also miss the mark. Cough suppressants and lozenges are aimed at coughs from colds, so they give little relief when bradykinin is the trigger. Many people keep buying them for months without improvement, which can be one clue that the medicine may be involved.
What to Do If You Think Your Blood Pressure Pill Is the Cause
Doctors are advised to consider an ACE inhibitor (the -pril pills) as a full or partial cause of any chronic cough, no matter when the pill was started.8PubMed. Angiotensin-converting enzyme inhibitor-induced cough: ACCP evidence-based clinical practice guidelines They should also rule out other causes, such as asthma-type airway disease or fluid in the lungs from heart trouble.9PubMed Central. ACEI-induced cough: A review of current evidence and its practical implications for optimal CV risk reduction So a cough with breathlessness, swollen ankles or wheezing needs checking rather than simply blaming the pill.
People with any dry cough on an ACE inhibitor are often switched to an ARB or another type of blood pressure drug, even if the cough is mild.10PubMed. Pathophysiology of cough with angiotensin-converting enzyme inhibitors: How to explain within-class differences? ARBs have names ending in -sartan, such as losartan, and ACE inhibitors cause cough about three times as often as they do.11PubMed Central. Angiotensin‐converting enzyme inhibitor induced cough compared with placebo, and other antihypertensives: A systematic review, and network meta‐analysis Other options include water pills such as chlorthalidone. In practice the ARB usually replaces the ACE inhibitor directly, often taken once a day like the old pill, so your routine barely changes. Your prescriber may recheck your blood pressure after a few weeks to confirm the new pill works as well as the old one.
Putting up with the cough has a cost. People who keep taking an ACE inhibitor and treat the cough with cough medicine take their pills reliably only about half the time, versus three in four for others.12PubMed. The effects of antitussive treatment of ACE inhibitor-induced cough on therapy compliance: a prescription sequence symmetry analysis People with blood pressure pill side effects are about seven times more likely to stop taking them properly.13PubMed Central. Exploring the association of adverse drug reactions with medication adherence and quality of life among hypertensive patients: a cross-sectional study Ask for a switch rather than quietly skipping doses.
When you talk to your prescriber, say when the cough started, what it feels like and what makes it worse. Bring a list of all your medicines, including eye drops and inhalers, and ask whether a -sartan or another drug suits you. Stopping a blood pressure pill on your own can let pressure creep back up, often with no symptoms to warn you. Your prescriber can swap the drug in one step so there is no gap in protection.
After the ACE inhibitor is stopped, the cough usually fades within one to four weeks. Some people take up to three months to be fully free of it. If it lasts well beyond that, another cause is likely and worth investigating.
Sudden Swelling With Cough Is an Emergency
ACE inhibitors and diabetes pills called DPP-4 inhibitors, such as sitagliptin, can trigger angioedema, sudden deep swelling caused by the same bradykinin build-up.14British Journal of Anaesthesia. Treatment by PCCs of a life threatening laryngeal bradykinin angio-oedema precipitated by DPP-4 inhibitor and ACE inhibitor Swelling of the tongue and throat can cause coughing, a hoarse voice, trouble swallowing and difficulty breathing.15British Journal of Anaesthesia. Treatment by PCCs of a life threatening laryngeal bradykinin angio-oedema precipitated by DPP-4 inhibitor and ACE inhibitor Call emergency services for any of these signs, even years after starting the drug.
The usual ACE inhibitor cough comes with no visible change in your face or mouth. Sudden swelling is different: the lips, face, tongue or throat swell in a way you or someone else can see or feel, often building over hours. Taking both drug types together can raise the risk, and after an episode of sudden swelling you should never take the drug again.
Inhalers That Make You Cough
The device type, the drug, the dose and added ingredients can all trigger cough by stimulating cough sensors in the airway.16PubMed Central. Cough as an adverse effect on inhalation pharmaceutical products The spray’s acidity, saltiness, strength of puff and droplet size matter too.17PubMed Central. Cough as an adverse effect on inhalation pharmaceutical products In children with asthma using steroid inhalers with spacers, just over half coughed after each puff.18PubMed. Cough after inhalation of corticosteroids delivered from spacer devices in children with asthma About 3 in 10 of those also coughed with reliever inhalers.19PubMed. Cough after inhalation of corticosteroids delivered from spacer devices in children with asthma
The cough usually comes from irritation as the spray passes over the throat, not from the medicine failing or the asthma worsening. A brief cough straight after a puff is common, but one that goes on, with wheeze or breathlessness, is worth reporting.
Several changes can help. A spacer is a chamber that holds the spray so you breathe it in slowly, which softens the blast hitting the back of the throat. A dry powder inhaler uses no propellant, so it may suit some people who cough with sprays, though it needs a faster, deeper breath to work. Have your technique checked and rinse your mouth after steroid puffs. Ask your prescriber or pharmacist which device fits you. Don’t stop a preventer inhaler without advice, since asthma control matters more than the cough.
Beta-Blocker Eye Drops and Pills
Asthma flare-ups and tightened airways from beta-blocker eye drops are well known.20PubMed. Pulmonary complications from ophthalmic preparations In people with asthma, newly starting non-selective drops made a moderate flare-up nearly five times more likely.21PubMed Central. Respiratory effect of beta‐blocker eye drops in asthma: population‐based study and meta‐analysis of clinical trials About one in three people with asthma had a big drop in lung function after these drops.22PubMed Central. Respiratory effect of beta‐blocker eye drops in asthma: population‐based study and meta‐analysis of clinical trials Breathlessness is among the most reported side effects of these glaucoma drops.23PubMed. A national analysis of systemic adverse events of beta-blockers used for glaucoma therapy
The drops reach the lungs because they drain through a small channel at the inner corner of the eye into the nose, where the lining absorbs them into the bloodstream. Once in the blood, a beta-blocker can tighten the airway muscles even though it was meant to act only on the eye. Beta-blocker pills like propranolol can do the same.
After putting in a drop, close your eye and press a finger gently on the inner corner, next to the nose, for about a minute so less drains away. If you have asthma and cough or wheeze after starting glaucoma drops, ask your eye doctor about safer options, since other drop types exist.
Heart Pills That Cause Cough Through Reflux
Calcium channel blockers such as amlodipine and diltiazem relax the muscle that keeps stomach acid out of the food pipe.24American Journal of Gastroenterology. S2676 Iatrogenic GERD With Extraesophageal Manifestations Proven by Impedance Testing25PubMed Central. Calcium Channel Blockers and Esophageal Sclerosis: Should We Expect Exacerbation of Interstitial Lung Disease? They also weaken the squeezing that clears acid back down.26PubMed Central. Calcium Channel Blockers and Esophageal Sclerosis: Should We Expect Exacerbation of Interstitial Lung Disease? In one reported case, a woman developed severe reflux and night-time coughing two months after diltiazem was added.27American Journal of Gastroenterology. S2676 Iatrogenic GERD With Extraesophageal Manifestations Proven by Impedance Testing Her cough and reflux cleared within a month of switching medicines.28American Journal of Gastroenterology. S2676 Iatrogenic GERD With Extraesophageal Manifestations Proven by Impedance Testing
Reflux cough often comes with heartburn, a sour taste or hoarseness, though some people cough with no heartburn at all. It tends to be worse when lying down or after a meal, when acid is most likely to rise. That pattern differs from the ACE inhibitor cough, a dry tickle not tied to meals or posture. Raising the head of the bed and avoiding late meals can help. Mention it to your doctor, since switching drugs may solve it.
Aspirin and Ibuprofen in Sensitive People
In people with a condition called aspirin-exacerbated respiratory disease, aspirin, ibuprofen, naproxen and similar painkillers can cause congestion, sneezing, coughing and wheezing.29PubMed Central. Pathogenesis of NSAID-induced reactions in aspirin-exacerbated respiratory disease Symptoms usually start within 30 minutes to 3 hours of a dose.30PubMed Central. Pathogenesis of NSAID-induced reactions in aspirin-exacerbated respiratory disease These people typically have asthma and nasal polyps. If you suspect this, note whether cough, wheeze or a blocked, runny nose reliably follows a painkiller dose, and write down which product it was.
Aspirin, ibuprofen and naproxen are closely related in this reaction, so someone sensitive to one usually needs to avoid the others, including in combination cold remedies. Paracetamol is often tolerated better, but check with your doctor first, as it can still affect some people at higher doses. Tell every doctor and pharmacist about the reaction.
Medicines That Can Damage the Lungs
The lung-damaging drugs most seen in family practice are amiodarone for heart rhythm, nitrofurantoin for urine infections and methotrexate for arthritis.31Australian Journal of General Practice. Nitrofurantoin-induced pulmonary fibrosis Long-term nitrofurantoin use of six months or more can cause slowly worsening breathlessness and cough, usually without fever.32PubMed Central. Nitrofurantoin-Induced Pulmonary Toxicity: Mechanisms, Diagnosis, and Management This long-term form is more common in older people and may depend on dose.33PubMed Central. Nitrofurantoin-Induced Pulmonary Toxicity: Mechanisms, Diagnosis, and Management Cancer immunotherapy drugs can inflame the lungs, causing cough, breathlessness and tiredness.34PubMed Central. Immune Checkpoint Inhibitor-associated Pneumonitis: A Narrative Review35PubMed Central. Clinical diagnosis and treatment of immune checkpoint inhibitor‐associated pneumonitis
Unlike the dry tickle from an ACE inhibitor, this cough comes with breathlessness that gets worse over weeks, particularly when you climb stairs or walk briskly. Many people also feel unusually tired and find they can do less than before. Seek medical review rather than waiting it out.
The doctor will often arrange a chest scan or X-ray along with lung tests to see whether the drug is the cause. If you take cancer immunotherapy, report new cough or breathlessness to your treatment team right away, since they have specific ways to handle lung inflammation.
Speed matters. Stopping the drug early gives the lungs the best chance to recover, and scarring that sets in can be permanent. Still, don’t stop amiodarone yourself, because heart rhythm control matters too.
Checking Your Own Medicine List
Cough is the side effect doctors most often see when changing blood pressure treatment.36PubMed. Changes in antihypertensive therapy–the role of adverse effects and compliance So start your review with blood pressure, heart and diabetes pills, then move on to eye drops, inhalers and painkillers. Keep a short diary of when the cough happens and any doses taken. For the appointment, note when each medicine started relative to the cough, and mention any breathlessness, swelling, heartburn or fever.
Sometimes the medicine is not the cause. A cough with fever and mucus suggests infection, and coughs after a cold can linger for weeks. Smoking, allergies and asthma are common causes worth ruling out.