## First-Line Antihypertensive Agents in Essential Hypertension **Key Point:** In uncomplicated essential hypertension without comorbidities, calcium channel blockers (CCBs), ACE inhibitors, angiotensin receptor blockers (ARBs), and thiazide diuretics are all acceptable first-line agents. Amlodipine (a dihydropyridine CCB) is preferred in this scenario due to superior tolerability, efficacy, and minimal metabolic side effects. ### Why Amlodipine Is Optimal Here **High-Yield:** Amlodipine has: - Excellent BP-lowering efficacy with once-daily dosing - Minimal metabolic effects (no hyperglycemia, no hypokalemia, no lipid changes) - No cough (unlike ACE inhibitors) - No ankle edema at standard doses (unlike other dihydropyridines) - Proven cardiovascular protection in large RCTs **Clinical Pearl:** In patients without specific indications for ACE-I/ARB (diabetes, CKD, post-MI, heart failure) or beta-blockers (CAD, post-MI, heart failure), CCBs offer a neutral metabolic profile and excellent tolerability. ### Comparison of First-Line Agents | Agent | Mechanism | Metabolic Effects | Cough | Edema | Preferred In | |-------|-----------|-------------------|-------|-------|---------------| | **Amlodipine (CCB)** | L-type Ca²⁺ channel block | Neutral | No | Rare | Uncomplicated HTN, metabolic syndrome | | Lisinopril (ACE-I) | ACE inhibition | Neutral | Yes (10–20%) | No | Diabetes, CKD, post-MI, HF | | HCTZ (Thiazide) | Na⁺/Cl⁻ cotransport block | Hyperglycemia, hypokalemia, hyperuricemia | No | No | Isolated systolic HTN, older adults | | Labetalol (α/β-blocker) | Mixed adrenergic block | Fatigue, sexual dysfunction | No | No | Pregnancy, acute HTN crisis | **Tip:** The 2017 ACC/AHA guidelines and Indian guidelines (ICCM) list all four classes as first-line; choice depends on comorbidities. In *uncomplicated* HTN, amlodipine is often preferred due to side-effect profile. [cite:Harrison 21e Ch 297]
Sign up free to access AI-powered MCQ practice with detailed explanations and adaptive learning.