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Atenolol is a cardioselective beta-1 adrenergic antagonist introduced in the 1970s and now one of the most widely prescribed beta-blockers worldwide. It exhibits hydrophilic properties and is predominantly eliminated by the kidneys, contributing to a relatively predictable pharmacokinetic profile that supports once-daily dosing in many patients.

What Atenolol is and how it works

Mechanistically, atenolol binds selectively to beta-1 receptors located in cardiac tissue and the juxtaglomerular apparatus. This selective blockade reduces heart rate, myocardial contractility, and AV nodal conduction, thereby lowering cardiac output and oxygen demand during activity.

Concomitantly, suppression of renin release diminishes aldosterone production, aiding blood pressure control.

Common medical uses

The principal indication is essential hypertension, where atenolol lowers blood pressure by decreasing sympathetic outflow and renin activity.

In ischemic heart disease, it reduces myocardial oxygen demand and frequency of anginal episodes, improving exercise tolerance and prognosis in selected patients.

How it is typically taken

Atenolol is administered orally in tablets commonly available in 25 mg, 50 mg, and 100 mg strengths.

Initial dosing for hypertension is typically 25–50 mg once daily, titrated to 100 mg daily as tolerated and based on blood pressure response. For angina or post-infarction prophylaxis, treatment is individualized to clinical status.

Important safety information

Important safety information includes contraindications such as severe bradycardia, second- or higher-degree AV block without a pacemaker, and decompensated heart failure.

Use with caution in asthma or COPD, diabetes, peripheral vascular disease, and in pregnancy or lactation. Abrupt withdrawal may precipitate angina or tachyarrhythmias, particularly after chronic use.

Common side effects

Common adverse effects are bradycardia, fatigue, dizziness, and hypotension, which may impair daily activities.

Other frequent effects include cold extremities and sleep disturbances; sexual dysfunction can occur, and masking of hypoglycemia is possible in diabetics. Rarely, bronchospasm may occur in susceptible individuals despite beta-1 selectivity.