A beta-agonist is a type of medication that stimulates beta-adrenergic receptors in the body. These receptors are part of the nervous system and play a key role in regulating various functions, including heart rate and airway dilation. Beta-agonists are commonly used to treat conditions like asthma and chronic obstructive pulmonary disease (COPD) by relaxing the muscles around the airways, making it easier to breathe. There are two main types of beta-agonists: short-acting and long-acting. Short-acting beta-agonists provide quick relief from symptoms and are often used during asthma attacks, while long-acting beta-agonists are used for ongoing control of symptoms. Both types are important in managing respiratory conditions and improving quality of life for patients.