Lisinopril Side Effects — Complete Guide (2026)
- The dry cough affects 10–15% of lisinopril users — switching to an ARB eliminates it
- Angioedema (facial/throat swelling) is rare but a medical emergency — stop immediately
- Lisinopril reduces blood pressure by approximately 10–15 mmHg systolic
- Do not take with potassium supplements or salt substitutes — hyperkalaemia risk
- Black patients have a 3–4× higher risk of angioedema from ACE inhibitors — ARBs preferred
What Is Lisinopril?
Lisinopril is an ACE inhibitor (Angiotensin-Converting Enzyme inhibitor) — one of the most prescribed blood pressure medications in the world. It works by blocking the conversion of angiotensin I to angiotensin II, a potent vasoconstrictor — reducing blood pressure, reducing cardiac workload, and protecting the kidneys in diabetic patients.
Common Side Effects
| Side Effect | Frequency | What to Do |
|---|---|---|
| Dry, persistent cough | 10–15% | Switch to ARB (losartan, candesartan) — eliminates cough completely |
| Dizziness / lightheadedness | 5–10% | Rise slowly from sitting, check BP, discuss dose reduction |
| Headache | 5–6% | Usually resolves; take at night if problematic |
| Fatigue | 3–4% | Often temporary; review if persistent |
| High potassium (hyperkalaemia) | Rare at normal doses | Avoid potassium supplements; monitor if on K-sparing drugs or CKD |
Serious Side Effects — When to Seek Emergency Help
Angioedema — STOP and call 999/911 immediately
Angioedema is rapid swelling of the lips, tongue, throat, or face — caused by bradykinin accumulation from ACE inhibition. It occurs in approximately 0.1–0.7% of users, more commonly in Black patients (3–4× higher risk). It can occur even after years of taking the medication without problems. If you experience any facial or throat swelling on lisinopril, this is a medical emergency — stop the medication and call emergency services. You should never take an ACE inhibitor again after angioedema.
Acute Kidney Injury
In people with bilateral renal artery stenosis, lisinopril can cause acute kidney injury. Monitor eGFR and potassium 1–2 weeks after starting or dose increases.
The Dry Cough — What Causes It and What to Do
The ACE inhibitor cough is caused by bradykinin and substance P accumulation — the same mechanism as angioedema but less severe. It is a class effect of all ACE inhibitors (ramipril, enalapril, perindopril — all cause it at similar rates). The cough is typically dry, tickly, and persistent — often worse at night. The solution: switch to an ARB (losartan, candesartan, valsartan) — these block angiotensin II receptors directly without affecting bradykinin, providing identical cardiovascular benefits without the cough.