1st line drugs in hypertension
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"hypertension"[MeSH Terms] AND "antihypertensive agents"[MeSH Terms] AND "first-line"
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First-Line Drugs in Hypertension
Per the 2017 ACC/AHA Hypertension Guidelines (and consistent with the 2018 ESC/ESH guidelines), four drug classes are recommended as first-line agents for essential (primary) hypertension:
The Four First-Line Classes
| Class | Key Examples | Notes |
|---|---|---|
| Thiazide / Thiazide-like Diuretics | Chlorthalidone, hydrochlorothiazide (HCTZ), indapamide | Chlorthalidone preferred (longer half-life, proven outcomes) |
| Calcium Channel Blockers (CCBs) | Amlodipine, nifedipine ER, felodipine | Dihydropyridines preferred for HTN; verapamil/diltiazem if heart rate control is needed |
| ACE Inhibitors (ACEIs) | Lisinopril, enalapril, ramipril, perindopril | First choice if diabetes, CKD, or proteinuria present |
| Angiotensin Receptor Blockers (ARBs) | Losartan, valsartan, candesartan, olmesartan, telmisartan | Same indications as ACEIs; preferred when ACEI causes cough |
"The current evidence for an overall better benefit/risk ratio of ACE inhibitors/ARBs, Ca2+ channel blockers, and diuretics has led to the recommendation in both American and European guidelines that these four classes of drugs should be preferred as first-line agents in patients with essential hypertension devoid of compelling indications for other drugs."
- Goodman & Gilman's Pharmacological Basis of Therapeutics
What About Beta-Blockers?
Beta-blockers are NOT recommended as first-line for uncomplicated essential hypertension. The ALLHAT trial and subsequent meta-analyses showed they are less effective than the four classes above in reducing cardiovascular events (particularly stroke). However, they remain first-choice when compelling indications exist:
- Post-MI
- Heart failure with reduced EF
- Stable angina / CAD
- Rate control in atrial fibrillation
Compelling Indications - Drug Selection by Comorbidity
| Condition | Preferred Agents |
|---|---|
| Diabetes mellitus | ACEI or ARB |
| CKD / Proteinuria | ACEI or ARB (first-line) |
| Heart failure (HFrEF) | ACEI/ARB + beta-blocker + diuretic |
| Post-MI | ACEI/ARB + beta-blocker |
| Coronary artery disease / Stable angina | ACEI + beta-blocker, or CCB |
| Previous stroke | ACEI/ARB + thiazide diuretic |
| Left ventricular hypertrophy | ACEI, ARB, or CCB |
| Atrial fibrillation | ACEI/ARB; rate control with BB or diltiazem/verapamil |
| Asymptomatic atherosclerosis | CCB |
| BPH (concurrent) | Alpha-1 blocker (doxazosin, terazosin) as add-on |
| Pregnancy | Labetalol, nifedipine ER, or methyldopa |
Practical Treatment Approach
- Lifestyle modification first (sodium restriction, weight loss, exercise, alcohol moderation, DASH diet) - effective in mild HTN.
- For BP 140/90 or higher (or ≥130/80 with ≥10% 10-year CV risk): start pharmacotherapy.
- Monotherapy for mild-moderate HTN; start at low dose, titrate up.
- Combination therapy (two agents, often as single-pill) for moderate-severe HTN. Common pairings:
- ACEI/ARB + CCB (very effective)
- ACEI/ARB + thiazide
- CCB + thiazide
- Do NOT combine ACEI + ARB (more harm than benefit).
- Beta-blockers, alpha-blockers, and centrally acting agents (clonidine, methyldopa) are generally second- or third-line unless a specific indication applies.
Key Trials Supporting the First-Line Agents
- ALLHAT trial: Chlorthalidone was as effective as CCBs and ACEIs for coronary events; superior to lisinopril for stroke prevention and amlodipine for heart failure prevention.
- LIFE trial: ARBs (losartan) vs. beta-blockers - ARBs superior for stroke reduction in hypertension with LVH.
- Katzung's Basic and Clinical Pharmacology, 16th Ed.
- Goodman & Gilman's Pharmacological Basis of Therapeutics
- Brenner and Rector's The Kidney
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