Beta-2 agonists are a class of medications that primarily target the beta-2 adrenergic receptors in the body. They are commonly used to treat respiratory conditions such as asthma and chronic obstructive pulmonary disease (COPD) by relaxing the muscles around the airways, making it easier to breathe. These medications can be short-acting or long-acting, depending on their duration of effect. In addition to their use in respiratory therapy, Beta-2 agonists are sometimes used in other medical contexts, such as managing preterm labor by relaxing uterine muscles. While generally safe, they can have side effects, including increased heart rate and tremors, which should be monitored by healthcare providers.