Treating high blood pressure: strategy and drug choice

How doctors bring blood pressure down: lifestyle first, then a few proven drug families, often two together in one pill.

Updated Nov 12, 2026

Hypertension is common, silent and a leading cause of stroke, heart attack, heart failure and kidney disease. Treatment aims to lower pressure steadily over years, because the fall in pressure itself, more than the drug used, prevents these events. This page covers the overall strategy, how drugs are chosen for a given patient, very high pressure, and hypertension that does not respond.

Key points

WHO defines hypertension as a pressure of 140/90 mmHg or more on two different days; the target is below 130/80 for people with heart or kidney disease, diabetes or high risk, and below 140/90 for most others.
Lowering the pressure is what protects the patient; trials comparing the main drug families found broadly similar outcomes.
Four families are first line: ACE inhibitors or ARBs, calcium channel blockers and thiazide-type diuretics.
Most patients need two or more drugs; combining low doses, ideally in a single pill, works better and is easier to follow than pushing one drug to its maximum.
Very high pressure is an emergency only when organs are being damaged; then the pressure is lowered in a controlled way with intravenous drugs.
Resistant hypertension is often explained by poor adherence, salt, too little diuretic, interfering drugs or primary aldosteronism.

Why it matters and how big the problem is

WHO estimates that about a third of adults aged 30 to 79 have hypertension, and two thirds of them live in low- and middle-income countries such as those of Latin America. Many do not know they have it, and fewer than a quarter of all people with hypertension have it under control. Because it rarely causes symptoms, detection depends on measuring blood pressure at routine visits, and success depends on long-term follow-up.

Lifestyle measures: always part of treatment

Lifestyle changes lower pressure on their own and make drugs work better. They are offered to everyone, whether or not drugs are started.

Less salt and a diet rich in fruit, vegetables and whole grains (for example the DASH eating plan)
Regular physical activity
Weight loss in people with overweight or obesity
Limiting alcohol and stopping tobacco
Stress management and enough sleep

First-line drugs and how they are combined

American and European guidelines prefer four families for uncomplicated hypertension: ACE inhibitors or ARBs (never both together), dihydropyridine calcium channel blockers such as amlodipine, and thiazide or thiazide-like diuretics such as hydrochlorothiazide, chlorthalidone or indapamide. Drugs that give smooth 24-hour control with one daily dose are preferred, because adherence decides long-term success. Starting two drugs at low to moderate doses, usually a RAS blocker with a calcium channel blocker or a diuretic, controls more patients than raising the dose of one drug. A thiazide pairs well with a RAS blocker partly because the RAS blocker limits the potassium loss caused by the diuretic. Fixed single-pill combinations reduce the number of tablets and improve adherence, and the WHO guideline supports them.

Choosing for the individual patient

Other illnesses can make one family the obvious choice, or rule one out.

Diabetes or albuminuric kidney disease: an ACE inhibitor or ARB is preferred because it also protects the kidney.
Heart failure with reduced ejection fraction: beta blocker, RAS blocker (or sacubitril–valsartan), diuretic and mineralocorticoid receptor antagonist, as in the heart-failure regimen.
After a heart attack or with angina: a beta blocker is useful.
Pregnancy: ACE inhibitors, ARBs and direct renin inhibitors are contraindicated; labetalol, nifedipine or methyldopa are the usual options.
Gout: thiazides can raise uric acid. Asthma: non-selective beta blockers are avoided.
Beta blockers and alpha blockers are not first choices for uncomplicated hypertension; they are kept for specific indications.

Very high pressure: urgency versus emergency

What decides the approach is not the number on the cuff but whether organs are being injured. In a hypertensive emergency there is acute damage to the brain, heart, aorta, kidneys or retina (for example encephalopathy, acute heart failure with pulmonary oedema, aortic dissection or eclampsia). The patient is treated in hospital with titratable intravenous drugs such as nitroprusside, labetalol, esmolol, nicardipine or clevidipine, a very short-acting dihydropyridine broken down by blood esterases. The pressure is lowered in steps, not abruptly, because organs used to high pressure can lose blood flow if it falls too fast; aortic dissection is the exception that needs rapid control. When pressure is very high without organ damage, oral treatment is restarted or adjusted and the patient is reviewed soon; rushing the pressure down brings risk without clear benefit.

Resistant hypertension

Hypertension is called resistant when it stays above target despite several well-chosen drugs at full doses, including a diuretic. Before adding more, the usual causes are checked:

Not taking the medicines, or doses that are too low
Too much salt, or too little diuretic for the salt retention caused by vasodilators
Drugs that raise pressure: NSAIDs, decongestants, ciclosporin, erythropoietin, liquorice, cocaine and amphetamines
Secondary causes, especially primary aldosteronism, sleep apnoea and kidney disease
Low-dose spironolactone is the best-supported add-on drug, as shown in the PATHWAY-2 trial

Test yourself

Think of the answer, then tap the question to see it.

Which four drug families are first line for uncomplicated hypertension?

ACE inhibitors, ARBs, calcium channel blockers and thiazide or thiazide-like diuretics (an ACE inhibitor and an ARB are not combined).

Why do guidelines prefer combining two drugs at low doses over raising the dose of one?

Most patients need more than one drug, a combination lowers pressure more with fewer dose-related side effects, and a single-pill combination is easier to take every day.

What separates a hypertensive emergency from very high pressure without an emergency?

Acute damage to an organ, such as the brain, heart, aorta, kidneys or retina. The pressure value alone does not decide it.

Why is the pressure lowered in steps rather than abruptly in most hypertensive emergencies?

Organs adapted to high pressure can lose blood flow if it drops too fast, causing stroke, myocardial or kidney ischaemia. Aortic dissection is the exception.

Which drug is the best-supported fourth agent in resistant hypertension?

Low-dose spironolactone, a mineralocorticoid receptor antagonist; many such patients have excess aldosterone.

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Educational content on how drugs work; not a prescribing guide and no substitute for a health professional's advice. No doses are given.

Sources: Hypertension (World Health Organization, 2026); Guideline for the pharmacological treatment of hypertension in adults (World Health Organization, 2021); High Blood Pressure - Treatment | NHLBI, NIH (National Heart, Lung, and Blood Institute, 2026).

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