Lisinopril Side Effects: The Cough, Angioedema, and More

The Lisinopril Cough: What You Need to Know

The dry, persistent cough is the most common side effect of lisinopril and all ACE inhibitors. It affects approximately 10–15% of patients in Western populations and up to 30–40% of patients of Asian descent. The cough is non-productive (no mucus), often described as tickling or irritating, and can be severe enough to disrupt sleep.

Why Does Lisinopril Cause a Cough?

Lisinopril blocks angiotensin-converting enzyme (ACE), which normally breaks down a peptide called bradykinin. When ACE is inhibited, bradykinin accumulates in the lungs and stimulates sensory nerve fibers in the airways, triggering the cough reflex. This is a class effect — all ACE inhibitors cause cough through the same mechanism.

When Does the Cough Start?

The cough typically begins within the first few weeks of starting lisinopril, though it can develop months or even years into treatment. It is not dose-dependent — reducing the dose rarely eliminates the cough. The cough resolves within 1–4 weeks of stopping the medication.

What to Do About the Lisinopril Cough

If you develop a persistent dry cough on lisinopril:

1. Tell your prescriber — do not simply stop the medication without guidance
2. Confirm the cough is from lisinopril (rule out respiratory infection, asthma, GERD, or other causes)
3. Consider a brief medication holiday (2–4 weeks) to confirm the cough resolves
4. Switch to an ARB (angiotensin receptor blocker) such as losartan, valsartan, or olmesartan — ARBs do not affect bradykinin and do not cause cough

Cough suppressants (dextromethorphan, codeine) are not effective for ACE inhibitor cough because the mechanism is neurogenic, not inflammatory. Do not simply switch to a different ACE inhibitor — the cough will return.

Angioedema: Rare but Potentially Life-Threatening

Angioedema — sudden swelling of the face, lips, tongue, throat, or extremities — is a rare but serious side effect of lisinopril, occurring in approximately 0.1–0.7% of patients. It is caused by the same bradykinin accumulation that causes the cough, but in a more severe form.

Who Is at Higher Risk?

Angioedema is 3–4 times more common in Black patients than in White patients. Other risk factors include:

• Prior history of angioedema (from any cause)
• Hereditary angioedema
• Concurrent use of other drugs that affect bradykinin (e.g., neprilysin inhibitors)
• Female sex

When Does Angioedema Occur?

Angioedema can occur at any time during treatment — including after years of uneventful use. The first episode often occurs within the first month, but late-onset angioedema is well-documented.

What to Do

Angioedema involving the tongue, throat, or larynx is a medical emergency. Call 911 or go to the emergency room immediately. Lisinopril must be permanently discontinued — never rechallenged. Patients with ACE inhibitor angioedema should be switched to an ARB (which has a much lower risk of angioedema) rather than another ACE inhibitor.

Hyperkalemia (High Potassium)

Lisinopril reduces aldosterone secretion, which normally promotes potassium excretion by the kidneys. As a result, potassium levels can rise — a condition called hyperkalemia. This is usually mild and asymptomatic, but severe hyperkalemia can cause dangerous heart rhythm abnormalities.

Risk factors for lisinopril-associated hyperkalemia include:

• Chronic kidney disease (reduced potassium excretion)
• Diabetes
• Concurrent use of potassium-sparing diuretics (spironolactone, eplerenone, amiloride)
• Concurrent use of potassium supplements
• NSAIDs (reduce renal potassium excretion)

Potassium levels should be checked within 1–2 weeks of starting lisinopril, particularly in patients with CKD or on other RAAS-active medications.

Hypotension (Low Blood Pressure)

The first dose of lisinopril can cause a significant drop in blood pressure, particularly in patients who are volume-depleted (dehydrated, on diuretics, or with heart failure). This "first-dose hypotension" can cause dizziness, lightheadedness, or fainting.

To minimize this risk:

• Start with a low dose (5–10 mg) in high-risk patients
• Take the first dose at bedtime
• Hold diuretics for 24 hours before the first dose in volume-depleted patients

Acute Kidney Injury

Lisinopril reduces intraglomerular pressure by dilating the efferent arteriole. In most patients, this is beneficial — it reduces proteinuria and slows CKD progression. However, in patients with bilateral renal artery stenosis or severe heart failure with very low cardiac output, reducing intraglomerular pressure can precipitate acute kidney injury.

Creatinine and potassium should be checked 1–2 weeks after starting lisinopril. A rise in creatinine of up to 30% is acceptable and expected; a rise greater than 30% warrants dose reduction or discontinuation and investigation for renal artery stenosis.

Fetal Toxicity: Contraindicated in Pregnancy

Lisinopril is contraindicated during pregnancy. ACE inhibitors cause fetal renal tubular dysplasia, oligohydramnios (reduced amniotic fluid), neonatal renal failure, skull hypoplasia, and death when used in the second and third trimesters. Women of childbearing age should use effective contraception while on lisinopril and should notify their prescriber immediately if they become pregnant.

Complete Side Effect Summary

References

1. Israili ZH, Hall WD. Cough and angioneurotic edema associated with angiotensin-converting enzyme inhibitor therapy. Ann Intern Med. 1992;117(3):234-242.
2. Sica DA, et al. Angioedema in patients receiving ACE inhibitors. Pharmacotherapy. 2004;24(9):1211-1217.
3. ALLHAT Officers. Major outcomes in high-risk hypertensive patients randomized to ACE inhibitor or calcium channel blocker vs diuretic (ALLHAT). JAMA. 2002;288(23):2981-2997.