Lisinopril

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Lisinopril on Prescriptsy

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Lisinopril is a prescription-only medicine belonging to the class of angiotensin-converting enzyme (ACE) inhibitors.

It is one of the most widely prescribed antihypertensive medicines in the United Kingdom and is used to treat high blood pressure (hypertension), heart failure, and diabetic nephropathy.

Lisinopril is also given after a heart attack (myocardial infarction) to improve survival and reduce the risk of further cardiac events.

It works by blocking the enzyme that produces angiotensin II, a substance that narrows blood vessels and raises blood pressure.

By reducing angiotensin II, lisinopril causes blood vessels to relax, lowering blood pressure and reducing the strain on the heart and kidneys.

Hypertension affects approximately one in three adults in the United Kingdom, according to data from the British Heart Foundation.

Because high blood pressure rarely produces symptoms until serious organ damage has occurred, many people are unaware they have it.

Persistently elevated blood pressure is a major risk factor for stroke, coronary artery disease, heart failure, chronic kidney disease, peripheral arterial disease, and vascular dementia.

Effective treatment with medicines such as lisinopril, combined with lifestyle changes, substantially reduces these risks.

This page provides a comprehensive clinical guide to lisinopril, covering how it works, who should take it, dosage, side effects, safety warnings, and how to obtain a prescription in the UK.

Important safety information about lisinopril

Before reading further, note these essential safety points.

• Lisinopril is a prescription-only medicine (POM) and must be used under medical supervision.
• ACE inhibitors must not be taken during pregnancy, particularly the second and third trimesters, as they can cause serious harm to the unborn child.
• Angioedema (swelling of the face, lips, tongue, or throat) is a rare but potentially life-threatening side effect. Seek emergency help immediately if this occurs.
• Regular blood tests are needed to monitor kidney function and potassium levels.
• Tell your prescriber about all medicines you take, including over-the-counter painkillers and supplements.

Understanding hypertension and cardiovascular risk

Blood pressure is measured in millimetres of mercury (mmHg) and expressed as two numbers: systolic (the pressure when the heart pumps) over diastolic (the pressure when the heart relaxes).

NICE guideline NG136 defines hypertension as a clinic blood pressure of 140/90 mmHg or above, confirmed by ambulatory or home monitoring showing an average of 135/85 mmHg or higher.

Hypertension is categorised into stages: stage 1 (clinic 140/90 to 159/99 mmHg), stage 2 (160/100 to 179/119 mmHg), and stage 3 or severe (180/120 mmHg or above, requiring urgent assessment).

Most hypertension is primary (essential), meaning no single identifiable cause is found.

Risk factors include age, family history, excess salt intake, obesity, physical inactivity, excessive alcohol consumption, and stress.

Secondary causes such as renal artery stenosis, primary aldosteronism, and phaeochromocytoma are uncommon but should be considered in resistant or early-onset hypertension.

Management begins with lifestyle changes: reducing salt to below 6 g daily, eating more fruit and vegetables, maintaining a healthy weight, exercising regularly, limiting alcohol, and stopping smoking.

When lifestyle measures are insufficient, antihypertensive medication is introduced.

How lisinopril works: mechanism of action

The renin-angiotensin-aldosterone system (RAAS) plays a central role in blood pressure regulation.

When blood pressure or blood volume falls, the kidneys release renin, which converts angiotensinogen (produced by the liver) into angiotensin I.

Angiotensin-converting enzyme (ACE), found predominantly in the lungs, then converts angiotensin I into angiotensin II.

Angiotensin II is a powerful vasoconstrictor that raises blood pressure by narrowing arteries and stimulating aldosterone release from the adrenal glands, causing the kidneys to retain sodium and water.

Lisinopril blocks ACE, preventing the formation of angiotensin II.

This produces several beneficial effects: arteries relax and widen (reducing peripheral resistance), aldosterone secretion decreases (promoting modest sodium and water excretion), and the heart faces less resistance when pumping blood (reducing cardiac workload).

Lisinopril also prevents the breakdown of bradykinin, a vasodilatory peptide, which contributes to its blood pressure-lowering effect but is also responsible for the dry cough that some patients experience.

Unlike most other ACE inhibitors, lisinopril is not a prodrug.

Medicines such as ramipril and enalapril must be converted by the liver into their active forms (ramiprilat and enalaprilat respectively), whereas lisinopril is already active when absorbed from the gut.

It is water-soluble, does not bind significantly to plasma proteins, and is excreted unchanged by the kidneys.

This pharmacokinetic profile means that hepatic impairment does not affect its activity, but dose adjustment is necessary in patients with significant renal impairment.

Clinical evidence supporting lisinopril

Lisinopril has a substantial evidence base across multiple cardiovascular conditions.

The ALLHAT (Antihypertensive and Lipid-Lowering Treatment to Prevent Heart Attack Trial) compared lisinopril with chlorthalidone and amlodipine in over 33,000 patients with hypertension and found comparable rates of coronary heart disease events.

The ATLAS (Assessment of Treatment with Lisinopril and Survival) trial demonstrated that higher doses of lisinopril (32.5 to 35 mg daily) reduced the combined risk of death and hospitalisation for heart failure by 12% compared with lower doses (2.5 to 5 mg daily) in patients with systolic heart failure.

The GISSI-3 trial showed that lisinopril started within 24 hours of acute myocardial infarction significantly reduced mortality at 6 weeks.

The EUCLID study provided evidence that lisinopril slowed the progression of retinopathy and reduced microalbuminuria in patients with type 1 diabetes.

NICE guideline NG136 recommends ACE inhibitors as first-line treatment for hypertension in patients under 55 years of age who are not of Black African or African-Caribbean descent.

For patients aged 55 and over, or of Black African or African-Caribbean descent, a calcium channel blocker or thiazide-like diuretic is recommended first, with an ACE inhibitor added at step 2 if needed.

ACE inhibitors are also recommended in NICE guideline NG106 for chronic heart failure with reduced ejection fraction and in CKD guidelines for patients with proteinuric kidney disease, regardless of blood pressure.

Lisinopril compared with other antihypertensives

ACE inhibitors such as lisinopril are one of four main classes of antihypertensive used in the UK, alongside calcium channel blockers (amlodipine, felodipine), thiazide-like diuretics (indapamide, chlorthalidone), and angiotensin receptor blockers (ARBs, such as losartan and candesartan).

ARBs work on the same pathway as ACE inhibitors but block the angiotensin II receptor rather than the enzyme.

ARBs do not cause the dry cough associated with ACE inhibitors and are used as an alternative when ACE inhibitor cough is intolerable.

Within the ACE inhibitor class, lisinopril, ramipril, enalapril, and perindopril are the most commonly prescribed in the UK.

Ramipril has particularly strong cardiovascular outcome data from the HOPE (Heart Outcomes Prevention Evaluation) trial.

Lisinopril is distinguished by its long duration of action (allowing once-daily dosing), lack of hepatic metabolism (an advantage in liver disease), and relatively linear dose-response relationship.

The choice between ACE inhibitors is often guided by prescriber familiarity, patient tolerance, and formulary considerations.

Beta-blockers (atenolol, bisoprolol) are no longer recommended as first-line antihypertensives by NICE but remain important in heart failure, post-MI management, and rate control in atrial fibrillation.

Mineralocorticoid receptor antagonists (spironolactone) are recommended as step 4 treatment for resistant hypertension. The selection and combination of antihypertensives should be individualised according to each patient's clinical profile.

Dosage and administration

Lisinopril is taken once daily, at the same time each day, with or without food.

For hypertension, the starting dose is typically 10 mg, increasing to 20 mg after 2 to 4 weeks if blood pressure remains above target.

The maximum dose is 80 mg daily.

For heart failure, treatment begins at 2.5 mg and is titrated upwards at intervals of at least 2 weeks to a target of 20 to 35 mg daily.

Following a heart attack, treatment starts at 5 mg within 24 hours, with doses at 24 and 48 hours, reaching 10 mg daily for at least 6 weeks.

Dose reduction is required in renal impairment.

Your prescriber will arrange blood tests (serum creatinine, eGFR, and potassium) before starting lisinopril, 1 to 2 weeks after initiation or dose change, and at regular intervals during maintenance.

These tests detect rising potassium (hyperkalaemia) and declining kidney function, both of which may require dose adjustment or discontinuation.

Side effects of lisinopril

Common side effects

The most characteristic side effect of lisinopril is a persistent dry cough, which occurs in approximately 5 to 15% of patients.

The cough is caused by accumulation of bradykinin and substance P in the bronchial mucosa and is unrelated to infection.

It typically appears within the first few months of treatment and resolves within 1 to 4 weeks of stopping the medicine.

Headache, dizziness, fatigue, nausea, and diarrhoea are also commonly reported. Hypotension (low blood pressure) can occur, particularly after the first dose in volume-depleted patients.

Electrolyte and renal effects

Hyperkalaemia (raised potassium) is a clinically important risk, especially in patients with impaired kidney function, diabetes, or those taking other medicines that raise potassium (spironolactone, amiloride, potassium supplements, trimethoprim).

Mild hyperkalaemia is often asymptomatic, but severe elevation can cause muscle weakness, palpitations, and life-threatening cardiac arrhythmias. Regular blood monitoring is essential.

A small rise in serum creatinine (up to 30% above baseline) is expected when starting an ACE inhibitor and reflects the haemodynamic effect on the kidney.

Larger rises require review.

Rare but serious side effects

Angioedema is the most important rare side effect. It presents as sudden swelling of the face, lips, tongue, or throat and can cause airway obstruction.

If any swelling occurs, stop lisinopril immediately and call 999. Angioedema is more common in patients of Black African or African-Caribbean descent.

Other rare effects include hepatic dysfunction, pancreatitis, severe skin reactions (pemphigus, Stevens-Johnson syndrome), and blood disorders (neutropaenia, agranulocytosis, thrombocytopaenia).

When to seek urgent medical advice

Contact your GP or call NHS 111 for a persistent dry cough, dizziness, rash, or altered taste.

Call 999 or attend A&E if you experience swelling of the face, lips, tongue, or throat, difficulty breathing, chest pain, signs of a stroke (facial drooping, arm weakness, speech difficulty), or collapse.

Report suspected adverse reactions to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk .

Warnings and precautions

Contraindications

Lisinopril must not be used in patients with a history of angioedema associated with previous ACE inhibitor therapy, hereditary or idiopathic angioedema, significant bilateral renal artery stenosis, or during the second and third trimesters of pregnancy.

Concurrent use with aliskiren is contraindicated in patients with diabetes or eGFR below 60 mL/min.

Pregnancy and breastfeeding

ACE inhibitors are teratogenic and must not be used during pregnancy.

Exposure in the second and third trimesters can cause fetal renal failure, oligohydramnios, skull ossification defects, and neonatal death.

Women planning pregnancy should switch to a safer alternative before conception. Lisinopril is not recommended during breastfeeding due to insufficient safety data.

Drug interactions

NSAIDs (ibuprofen, naproxen, diclofenac) reduce the antihypertensive effect and increase the risk of renal impairment and hyperkalaemia when taken with lisinopril.

Lithium clearance is reduced, and concurrent use requires careful lithium level monitoring. Potassium-sparing diuretics, potassium supplements, and salt substitutes containing potassium increase the risk of dangerous hyperkalaemia.

Co-trimoxazole (trimethoprim/sulfamethoxazole) can also raise potassium and should be used cautiously.

Monitoring requirements

Baseline and regular monitoring of serum creatinine, eGFR, and potassium is mandatory.

Closer monitoring is needed in patients with renal impairment, heart failure, diabetes, and those on concomitant medicines affecting potassium.

Blood pressure should be measured regularly, and your prescriber will aim for a target below 140/90 mmHg (or 130/80 mmHg in patients with diabetes or CKD).

How to get lisinopril in the UK

Lisinopril is a prescription-only medicine available through the NHS.

Your GP can prescribe it following a clinical assessment that includes blood pressure measurement, cardiovascular risk evaluation, and blood tests.

Authorised online prescribers registered with the General Pharmaceutical Council (GPhC) can also issue prescriptions after an appropriate clinical consultation.

The standard NHS prescription charge in England is currently 9.90 pounds per item; prescriptions are free in Scotland, Wales, and Northern Ireland.

Generic lisinopril is widely available and inexpensive.

Living with hypertension: lifestyle advice alongside lisinopril

Medication is most effective when combined with sustained lifestyle changes.

NICE recommends reducing salt intake to below 6 g per day, eating at least five portions of fruit and vegetables daily, maintaining a healthy weight, exercising for at least 150 minutes per week at moderate intensity, limiting alcohol to no more than 14 units per week, and stopping smoking.

Home blood pressure monitoring with a validated upper-arm device is encouraged.

Take readings before medication at the same time each day, and share records with your GP at review appointments. Aim for home readings consistently below 135/85 mmHg.

Sources

• Lisinopril Tablets, Summary of Product Characteristics (EMC)
• Lisinopril, British National Formulary (BNF)
• NICE NG136: Hypertension in adults: diagnosis and management
• Lisinopril, NHS medicines information
• NICE NG106: Chronic heart failure in adults
• MHRA Yellow Card Scheme