Quick facts
| Generic name | lisinopril |
|---|---|
| Brand names | ZestrilPrinivilQbrelis |
| Drug class | ACE inhibitor (angiotensin-converting enzyme inhibitor) |
| Generally used for | Lowers blood pressure, and is also used after a heart attack and in heart failure and diabetic kidney disease to protect the heart and kidneys. |
Health Captain explains what a medicine is generally used for, how its class works, and what to discuss with your care team. We never publish dosing, and this page cannot account for your medical history, kidney or liver function, pregnancy, or the other medicines you take. This is education, not prescribing advice — follow the instructions on your label and ask your prescriber or pharmacist.
What is Lisinopril?
Lisinopril is an ACE inhibitor. It blocks the enzyme that converts angiotensin I into angiotensin II, a hormone that narrows blood vessels and drives salt and water retention. With less angiotensin II, vessels relax and blood pressure falls. It is also used in heart failure, after a heart attack, and to protect kidneys in diabetes. A dry cough is its best-known side effect.
Key takeaways
- ACE inhibitors relax blood vessels by interrupting a hormone system that raises blood pressure and retains fluid.
- A persistent dry, tickly cough affects a meaningful minority of users and is not dangerous, but it is a common reason to switch to an ARB.
- Angioedema — sudden swelling of the lips, tongue, face, or throat — is rare, can happen at any point in treatment, and is an emergency.
- ACE inhibitors must not be used in pregnancy; they carry a boxed warning about fetal injury and death.
- This page is general education, not prescribing advice — whether this medicine is right for you, and how it is dosed, is individualized and decided by you and your prescriber.
How it generally works
Your body has a hormone cascade — the renin-angiotensin system — that raises blood pressure when it senses low pressure or low salt. The final step converts a precursor into angiotensin II, which squeezes blood vessels and tells the adrenal glands to hold on to sodium and water. Lisinopril blocks the enzyme that performs that conversion, so the squeeze eases and the fluid load drops.
The same block reduces pressure inside the kidney filtering units, which is why ACE inhibitors are used to slow kidney damage in diabetes even when blood pressure is not especially high. A side effect of blocking that enzyme is a build-up of bradykinin, an inflammatory messenger — this is the accepted explanation for the persistent dry cough some people develop and for the rare but serious swelling called angioedema.
Common side effects
Most people tolerate Lisinopril well, and many effects settle as the body adjusts. Tell your prescriber or pharmacist about anything that persists or bothers you.
- A dry, persistent, tickly cough that does not respond to cough remedies
- Dizziness or lightheadedness, especially in the first days or after a change
- Headache
- Fatigue
- A rise in blood potassium seen on lab work
- A modest rise in creatinine when treatment starts, which is often expected rather than alarming
Serious side effects
These are uncommon, but they are the ones to act on rather than wait out. Contact a clinician promptly if you notice any of them. If you believe you are experiencing a medical emergency, call emergency services immediately (911 in the United States).
- Sudden swelling of the lips, tongue, face, throat, or bowel wall — angioedema, which can obstruct the airway and needs emergency care
- Very little urine output, marked swelling, or rapidly rising creatinine — may reflect acute kidney injury, particularly with dehydration or narrowed kidney arteries
- Muscle weakness, numbness, or a slow or irregular heartbeat — may reflect high potassium
- Fainting or persistent lightheadedness — blood pressure lowered further than intended
- Yellowing of the skin or eyes — rare liver injury described in ACE inhibitor labeling
Important warnings
FDA boxed warning
A boxed warning is the strongest warning the US Food and Drug Administration applies to a medicine. It does not mean nobody should take it — it means the risk below is serious enough that it must be weighed deliberately with your prescriber.
- Fetal toxicity — ACE inhibitors carry an FDA boxed warning. Used during pregnancy, drugs acting on the renin-angiotensin system can injure and kill the developing fetus. They are stopped as soon as pregnancy is detected, and anyone who could become pregnant should discuss this before starting.
Other warnings and precautions
- Angioedema — swelling of the face, lips, tongue, throat, or intestine can occur at any time, is more common in Black patients, and is more likely in people with a history of angioedema from any cause. It is a reason never to take an ACE inhibitor again.
- Hyperkalemia — potassium can rise, especially with kidney disease, diabetes, potassium supplements, salt substitutes, or potassium-sparing diuretics.
- Kidney function — a modest creatinine rise on starting is common and often acceptable, but a large rise, or use when both kidney arteries are narrowed, needs evaluation.
- Symptomatic hypotension — most likely in people who are volume-depleted, on high-dose diuretics, or on a low-sodium diet.
- Do not combine with a direct renin inhibitor (aliskiren) in diabetes, and combining an ACE inhibitor with an ARB is generally avoided.
Drug interactions
Interactions are one of the most common avoidable medication problems. Keep one list of everything you take — including supplements and over-the-counter products — with the Medication List Builder, and read our guide to drug interactions.
- Potassium supplements, salt substitutes containing potassium chloride, and potassium-sparing diuretics (spironolactone, amiloride, triamterene) — all raise potassium further.
- NSAIDs including ibuprofen and naproxen — blunt the blood-pressure effect and, combined with a diuretic, form the "triple whammy" associated with acute kidney injury.
- ARBs and aliskiren — dual blockade of the same system increases kidney injury, hyperkalemia, and hypotension without added benefit for most people.
- Lithium — ACE inhibitors can raise lithium levels toward toxicity.
- Sacubitril/valsartan — must not overlap with an ACE inhibitor because of angioedema risk; a washout period is required.
- Diuretics — often deliberately combined, but the first dose after a diuretic can drop pressure sharply.
Monitoring
What a care team typically keeps an eye on while someone is taking Lisinopril. The exact schedule is individual.
- Blood pressure, ideally including home readings taken with a validated upper-arm cuff
- Serum potassium and creatinine roughly one to two weeks after starting or changing, then periodically
- Symptoms of dizziness, cough, or swelling reviewed at each visit
Storage
- Store tablets at room temperature, away from moisture and excess heat.
- Keep the oral solution according to the label; some formulations have a limited shelf life after opening.
- Keep in the original container so the name, strength, and expiry stay with the medicine.
Questions for your doctor or pharmacist
Pharmacists are the most under-used resource in medicine, and the conversation is usually free. Build an agenda with Appointment Prep.
- Can we go through my full medication list together — prescriptions, over-the-counter products, vitamins, herbal products, and supplements — to check for interactions, duplicates, and anything I no longer need?
- Am I taking this for blood pressure, for my heart, for my kidneys, or for more than one reason?
- When will my potassium and kidney function be rechecked after starting or changing this?
- If I develop a persistent dry cough, what is the alternative you would move me to?
- Could I become pregnant — and if so, what should we plan instead?
- Should I avoid salt substitutes and over-the-counter anti-inflammatories?
- What blood pressure number are we aiming for, and how should I be measuring it at home?
Frequently asked questions
Why does lisinopril cause a cough?
ACE does two jobs: it makes angiotensin II and it breaks down bradykinin. Blocking it leaves more bradykinin in the airway lining, which is the accepted explanation for a dry, tickly cough. It is not harmful and not an allergy, but it can be persistent and does not respond to cough syrup. It usually resolves within weeks of stopping.
Is the cough a reason to stop?
It is a common reason clinicians switch people to an ARB such as losartan, which blocks the receptor further downstream and does not cause the bradykinin build-up. That is a decision for your prescriber — stopping a blood pressure medicine on your own leaves the underlying pressure untreated, which is the greater risk.
What is angioedema and how would I recognize it?
It is sudden swelling in the deeper layers of tissue — most dangerously the lips, tongue, and throat. It can appear after the first dose or after years of uneventful use. Swelling of the tongue or any difficulty breathing or swallowing is an emergency: call 911. Once it happens, ACE inhibitors are generally avoided permanently.
Can I use ibuprofen while taking lisinopril?
Occasional use is often tolerated, but NSAIDs work against ACE inhibitors — they raise blood pressure and reduce kidney blood flow. The combination of an ACE inhibitor, a diuretic, and an NSAID is a recognized cause of acute kidney injury. Ask your pharmacist which pain reliever fits your kidney function and other medicines.
Sources
- MedlinePlus — Drugs, Herbs and Supplements — Plain-language drug information from the US National Library of Medicine; search for lisinopril.
- DailyMed — lisinopril labeling — The current FDA-approved prescribing information submitted by manufacturers.
- American Heart Association — High Blood Pressure — Patient information on blood pressure targets, measurement, and treatment.
- NHLBI — High Blood Pressure — National Heart, Lung, and Blood Institute patient information.
- FDA — Drug Safety and Availability — Safety communications, label changes, recalls, and shortage notices.
Health Captain links to primary public-health and clinical sources so you can read the original material yourself. See our sources policy.