Which side effect is commonly associated with bronchodilators?

Palpitations are a well-known side effect associated with bronchodilators, particularly those in the class of beta-agonists. These medications stimulate beta-adrenergic receptors in the airways, leading to relaxation of the bronchial muscles and improved airflow. However, they can also stimulate beta receptors in the heart, which can result in increased heart rate and palpitations. This cardiovascular response occurs because the body's sympathetic nervous system is activated, and it can lead to sensations of anxiety or an irregular heartbeat in some patients.

Other potential side effects of bronchodilators do exist, but palpitations are particularly noteworthy due to their direct association with the mechanisms of action. This helps distinguish them from other side effects like nausea, weight gain, or blurred vision, which are not typically related to the pharmacological effects of bronchodilators.