Adrenergic β-antagonists

Adrenergic β-antagonists (β-blockers)

Adrenergic β-antagonists block both β1 and β2 receptors. β1-receptors on heart muscle cells are blocked; this results in decrease in heart frequency. β-receptors on smooth muscle cells in blood vessels are blocked as well.

In the case of pheochromocytoma,

β-blockers treat the symptoms of tachycardia and hypertension. Selective β-blockers are also drugs of choice to treat essential hypertension.

For more information on β-receptor blockers, check the cardiology section.

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I. Propranolol is a non-selective β-blocker. II. A β-antagonist may cause impotention.