Sympathomimetics are a class of drugs that mimic the effects of the sympathetic nervous system, which is responsible for the body's "fight or flight" response. These substances stimulate adrenergic receptors, leading to increased heart rate, blood pressure, and energy levels. They are often used in medical settings to treat conditions like asthma, low blood pressure, and nasal congestion. Common examples of sympathomimetics include epinephrine, norepinephrine, and albuterol. These drugs can be administered in various forms, such as injections, inhalers, or oral tablets. While they can be effective in managing certain health issues, they may also have side effects, including increased heart rate and anxiety.