Quick answer

What is blood pressure medicines used for?

Blood pressure medicines lower the force of blood against artery walls, reducing heart attack and stroke risk. Common types include ACE inhibitors, ARBs, calcium channel blockers, thiazide diuretics and beta-blockers. Most people need lifelong treatment. Take medicines as prescribed — stopping suddenly can be harmful.

Why blood pressure medicines matter

High blood pressure (hypertension) rarely causes symptoms but significantly increases risk of heart attack, stroke, kidney disease, and dementia. Lifestyle changes — salt reduction, exercise, weight loss — are essential, but most people with sustained high readings also need medicines to reach safe levels. Treatment is usually lifelong and prevents serious events rather than making you feel better day to day.

Main types of blood pressure medicine

ACE inhibitors (names end in -pril)

Examples: ramipril, lisinopril, enalapril

  • relax blood vessels by blocking angiotensin-converting enzyme
  • often first choice in white patients under 55
  • also protect kidneys in diabetes
  • common side effect: persistent dry cough — switch to ARB if troublesome
  • rare serious reaction: angioedema (facial/tongue swelling) — seek emergency help

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

Examples: losartan, candesartan, valsartan

  • similar mechanism to ACE inhibitors without the cough
  • alternative if ACE inhibitor not tolerated
  • also kidney-protective in diabetes

Calcium channel blockers

Examples: amlodipine, felodipine, diltiazem

  • relax blood vessel muscle walls
  • often first choice in people over 55 and in Afro-Caribbean patients
  • common side effect: ankle swelling (amlodipine), flushing, headache
  • do not stop suddenly — diltiazem and verapamil affect heart rate

Thiazide diuretics

Examples: indapamide, bendroflumethiazide

  • reduce fluid volume by increasing urine output
  • often combined with ACE inhibitor or ARB
  • common effects: increased urination, low potassium (monitored with blood tests)
  • take in the morning to avoid night-time toilet trips

Beta-blockers

Examples: bisoprolol, atenolol

  • reduce heart rate and force of contraction
  • used when other conditions coexist — angina, heart failure, previous heart attack, atrial fibrillation
  • less commonly first choice for uncomplicated hypertension alone
  • common effects: tiredness, cold hands and feet, vivid dreams
  • do not stop suddenly — can trigger rebound heart problems

Other medicines

Spironolactone — added as fourth-line for resistant hypertension.

Alpha-blockers (doxazosin) — occasionally used; may cause dizziness on standing.

How treatment is chosen

NICE guidelines recommend starting with:

  • Under 55, white/other (non-Afro-Caribbean): ACE inhibitor or ARB
  • Over 55 or Afro-Caribbean: calcium channel blocker

If one medicine is insufficient, combine classes — for example ACE inhibitor plus calcium channel blocker plus thiazide diuretic.

Your GP considers other conditions — diabetes, heart failure, kidney disease, pregnancy — when choosing.

Taking medicines correctly

  • take at the same time each day — link to a daily routine
  • do not stop suddenly without GP advice — especially beta-blockers and clonidine
  • do not skip doses — occasional misses happen but regular adherence matters
  • home blood pressure monitoring helps track control — bring readings to reviews
  • attend annual medication reviews — blood tests for kidney function and potassium

Lifestyle alongside medicines

Medicines work best combined with:

  • reducing salt — below 6g daily
  • regular exercise — 150 minutes moderate activity weekly
  • healthy weight — losing weight lowers blood pressure
  • limiting alcohol — no more than 14 units weekly
  • stopping smoking
  • reducing caffeine if sensitive

Lifestyle alone may not replace medicines once hypertension is established, but it reduces how much medicine is needed.

Side effects and switching

Most people tolerate blood pressure medicines well. If side effects occur:

  • dry cough on ACE inhibitor → switch to ARB
  • ankle swelling on amlodipine → reduce dose or switch
  • dizziness → may indicate blood pressure too low; GP adjusts dose
  • erectile dysfunction — some medicines contribute; discuss alternatives

Never stop without discussing alternatives — uncontrolled blood pressure is more dangerous than manageable side effects.

Interactions to know

  • NSAIDs (ibuprofen, naproxen) — reduce blood pressure medicine effectiveness; worsen kidney function with ACE/ARB
  • decongestants (pseudoephedrine) — raise blood pressure
  • lithium — affected by diuretics and ACE inhibitors
  • potassium supplements — avoid with ACE/ARB/spironolactone unless prescribed

Tell your pharmacist about all medicines when buying over-the-counter products.

Blood pressure targets

General target is below 140/90 mmHg at home (below 135/85 on home monitor), or below 150/90 if over 80. People with diabetes or kidney disease often target lower — individualised by GP.

If blood pressure remains high

Resistant hypertension — not controlled despite three medicines — needs specialist review. Causes include:

  • non-adherence (most common)
  • white coat hypertension
  • sleep apnoea
  • secondary hypertension (hormone or kidney causes)
  • insufficient dosing

A GP or hypertension specialist investigates and adjusts.

Treating high blood pressure reduces risk of stroke, heart attack, and kidney damage. It often coexists with type 2 diabetes and high cholesterol — all managed together for cardiovascular protection, sometimes including statins.

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

Common questions

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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