Fenoterol is a selective β2-adrenergic agonist used as a bronchodilator to relieve asthma and COPD symptoms by relaxing bronchial smooth muscle and improving airflow. Developed in the 1960s to provide more β2 selectivity and fewer cardiac side effects than earlier non-selective agents, fenoterol became widely used in clinical practice as an effective rescue therapy for acute bronchospasm, marking an important advancement in targeted respiratory treatment.
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