Terbutaline, the key component of Bricanyl, works by stimulating β2-adrenergic receptors in the lungs. This leads to the relaxation of bronchial muscles and an opening of the airways, providing quick relief from bronchospasm and improving airflow to the lungs. The medication can be administered in various forms, including tablets, inhalers, and solution forms for nebulizers, catering to the different needs and preferences of patients with respiratory conditions.