Quick answer

What are blood pressure medicines used for?

Blood pressure medicines are drugs that lower the force of blood against artery walls, reducing the risk of heart attack and stroke. Common types include ACE inhibitors, ARBs, calcium channel blockers, thiazide diuretics and beta-blockers, and most people need to take them for life. They should be taken exactly as prescribed, since stopping suddenly can be harmful.

Why blood pressure medicines matter

High blood pressure (hypertension) rarely causes symptoms, but it significantly increases the risk of heart attack, stroke, kidney disease and dementia. Lifestyle changes such as reducing salt, exercising and losing weight are essential, but most people with sustained high readings also need medicines to bring their blood pressure down to a safe level. Treatment for high blood pressure is usually lifelong, and it works by preventing serious events in future rather than by making you feel better from day to day.

Main types of blood pressure medicine

ACE inhibitors (names ending in -pril)

Examples include ramipril, lisinopril and enalapril. ACE inhibitors relax blood vessels by blocking an enzyme called angiotensin-converting enzyme, and they are often the first choice in white patients under 55, as well as offering kidney protection in people with diabetes. A persistent dry cough is a common side effect, and switching to an ARB usually resolves it if it becomes troublesome. A rare but serious reaction is angioedema, causing facial or tongue swelling, which needs emergency help.

ARBs — angiotensin receptor blockers (names ending in -sartan)

Examples include losartan, candesartan and valsartan. ARBs work in a similar way to ACE inhibitors but without causing a cough, making them a good alternative if an ACE inhibitor is not tolerated. Like ACE inhibitors, they also offer kidney protection in people with diabetes.

Calcium channel blockers

Examples include amlodipine, felodipine and diltiazem. These medicines relax the muscle walls of blood vessels and are often the first choice in people over 55 and in Afro-Caribbean patients. A common side effect is ankle swelling with amlodipine, along with flushing and headache, and diltiazem and verapamil should not be stopped suddenly because they affect heart rate.

Thiazide diuretics

Examples include indapamide and bendroflumethiazide. These medicines reduce fluid volume by increasing urine output and are often combined with an ACE inhibitor or ARB. Common effects include increased urination and low potassium levels, which are monitored with blood tests, and they are best taken in the morning to avoid night-time toilet trips.

Beta-blockers

Examples include bisoprolol and atenolol. Beta-blockers reduce heart rate and the force of the heart’s contractions, and are used when other conditions coexist, such as angina, heart failure, a previous heart attack or atrial fibrillation, though they are less commonly the first choice for uncomplicated high blood pressure on its own. Common effects include tiredness, cold hands and feet, and vivid dreams, and beta-blockers should not be stopped suddenly because this can trigger rebound heart problems.

Other blood pressure medicines

Spironolactone is sometimes added as a fourth-line option for resistant hypertension. Alpha-blockers such as doxazosin are occasionally used and may cause dizziness on standing.

How treatment is chosen

NICE guidelines recommend starting with an ACE inhibitor or ARB in people under 55 who are white or from another non-Afro-Caribbean background, and a calcium channel blocker in people over 55 or of Afro-Caribbean origin. If one medicine is not enough to control blood pressure, classes are combined — for example an ACE inhibitor plus a calcium channel blocker plus a thiazide diuretic. Your GP also considers other conditions such as diabetes, heart failure, kidney disease and pregnancy when choosing the right medicine for you.

Taking blood pressure medicines correctly

Taking medicines at the same time each day, linked to part of your daily routine, helps build a consistent habit. Never stop suddenly without GP advice, especially with beta-blockers and clonidine, and try not to skip doses, since occasional misses happen but regular adherence matters most. Home blood pressure monitoring helps track how well treatment is working, so it is worth bringing your readings to review appointments, and attending annual medication reviews allows blood tests for kidney function and potassium to be checked.

Lifestyle alongside blood pressure medicines

Medicines work best when combined with lifestyle changes: reducing salt intake to below 6g daily, taking regular exercise of around 150 minutes of moderate activity a week, reaching and maintaining a healthy weight, limiting alcohol to no more than 14 units a week, stopping smoking, and reducing caffeine if you are sensitive to it. Lifestyle changes alone may not replace medicines once high blood pressure is established, but they do reduce how much medicine is needed.

Side effects and switching medicines

Most people tolerate blood pressure medicines well, but if side effects occur, there are usually alternatives. A dry cough caused by an ACE inhibitor can be resolved by switching to an ARB, while ankle swelling caused by amlodipine may improve with a reduced dose or a switch to another medicine. Dizziness can indicate that blood pressure has dropped too low, so a GP can adjust the dose, and erectile dysfunction is sometimes linked to certain blood pressure medicines, which is worth discussing so alternatives can be considered. You should never stop a blood pressure medicine without discussing alternatives first, since uncontrolled blood pressure is more dangerous than a manageable side effect.

Blood pressure medicine interactions with other drugs

NSAIDs such as ibuprofen and naproxen can reduce the effectiveness of blood pressure medicines and can worsen kidney function when combined with an ACE inhibitor or ARB. Decongestants containing pseudoephedrine can raise blood pressure, lithium levels are affected by diuretics and ACE inhibitors, and potassium supplements should be avoided alongside ACE inhibitors, ARBs or spironolactone unless specifically prescribed. Always tell your pharmacist about all the medicines you take when buying anything over the counter.

Blood pressure targets

The general target is below 140/90 mmHg at home (below 135/85 on a home monitor), or below 150/90 if you are over 80. People with diabetes or kidney disease are often given a lower, individualised target by their GP.

If blood pressure remains high

Resistant hypertension describes blood pressure that is not controlled despite taking three medicines, and this needs specialist review. Common causes include not taking medicines as prescribed (the most common reason), white coat hypertension, sleep apnoea, secondary hypertension caused by hormone or kidney problems, and simply needing a higher dose. A GP or hypertension specialist will investigate the cause and adjust treatment accordingly.

Treating high blood pressure reduces the risk of stroke, heart attack and kidney damage. It often coexists with type 2 diabetes and high cholesterol, and these conditions are usually managed together for overall cardiovascular protection, sometimes including statins.

See our high blood pressure condition guide for more on diagnosis and lifestyle advice.

Common questions about blood pressure medicines

What are the main types of blood pressure medicine?
ACE inhibitors (ramipril, lisinopril), ARBs (losartan, candesartan), calcium channel blockers (amlodipine), thiazide diuretics (indapamide), and beta-blockers (bisoprolol). Each works differently — a GP chooses based on age, ethnicity, other conditions, and side effects.
Will I need to take blood pressure medicine forever?
Usually yes — high blood pressure is a lifelong condition for most people. Lifestyle changes help but rarely replace medicines once treatment is needed. Some people reduce doses with significant weight loss — only with GP supervision.
What are common side effects?
Depends on the medicine — ACE inhibitors may cause a dry cough; amlodipine may cause ankle swelling; diuretics increase urination; beta-blockers may cause tiredness and cold hands. Many side effects settle or respond to switching medicines.
Can I take blood pressure medicine with other drugs?
Some interactions exist — especially NSAIDs (ibuprofen) which can reduce effectiveness and affect kidneys when combined with ACE inhibitors or ARBs. Tell your GP and pharmacist about all medicines including over-the-counter products.
What if my blood pressure is still high?
A GP may increase the dose, add a second medicine, or switch type. Most people need two or more medicines to reach target blood pressure. Home monitoring helps guide adjustments.

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