Adrenergic agonists are a class of medications that stimulate the adrenergic receptors in the body, mimicking the effects of the natural hormones epinephrine and norepinephrine. These receptors are involved in the body's "fight or flight" response, affecting various functions such as heart rate, blood pressure, and airway dilation. There are different types of adrenergic agonists, including alpha-agonists and beta-agonists, each targeting specific receptors. They are commonly used to treat conditions like asthma, cardiac arrest, and low blood pressure, helping to improve breathing, increase heart rate, and enhance blood flow.