NREMT Paramedic Practice

Which of the following refers to drugs that block the actions of the sympathetic nervous system?

1. Parasympathomimetics

2. Cholinergic drugs

3. Adrenergic blocking drugs

4. Sympathomimetics

The correct answer is: Adrenergic blocking drugs

Adrenergic blocking drugs are specifically designed to inhibit the effects of the sympathetic nervous system, which is responsible for the "fight or flight" responses in the body. By blocking adrenergic receptors, these drugs can decrease heart rate, reduce blood pressure, and address other conditions where sympathetic stimulation is detrimental. This makes them essential in managing a variety of cardiovascular conditions, such as hypertension and certain types of arrhythmias. In contrast, parasympathomimetics and cholinergic drugs enhance the effects of the parasympathetic nervous system, promoting "rest and digest" activities. Sympathomimetics, on the other hand, mimic the effects of the sympathetic nervous system, thereby increasing heart rate and blood pressure rather than blocking them. Thus, adrenergic blocking drugs appropriately fit the description of blocking the actions of the sympathetic nervous system.