Final answer:
Adrenergic agents are drugs that interact with the adrenergic receptors in the sympathetic nervous system. Examples include catecholamines like adrenaline and noncatecholamines like phenylephrine. These drugs can stimulate or inhibit specific target organs and are used to treat various conditions such as asthma, hypertension, and shock.
Step-by-step explanation:
Adrenergic agents are drugs that interact with the adrenergic receptors in the sympathetic nervous system, also known as the fight-or-flight response. Examples of adrenergic agents include both catecholamines and noncatecholamines. Catecholamines, such as adrenaline (epinephrine) and noradrenaline (norepinephrine), directly bind to adrenergic receptors. Noncatecholamines, like phenylephrine, mimic the actions of catecholamines but do not bind directly to the adrenergic receptors. These drugs can stimulate or inhibit specific target organs and are used to treat various conditions such as asthma, hypertension, and shock.