Nursing Assistant Certification (NAC) AMCA Practice Exam 2025 - Free NAC Practice Questions and Study Guide

A barbiturate is a type of sedative that works by depressing the central nervous system, leading to a calming effect. Historically, barbiturates have been used to treat anxiety, insomnia, and seizure disorders. Their sedative properties make them useful in various medical settings, particularly for their ability to induce sleep or reduce anxiety in patients.

The other choices do not function primarily as sedatives. Pheothiazine is primarily used as an antipsychotic for treating mental health conditions rather than for sedation. Lithium is a mood stabilizer used for managing bipolar disorder, and while it can have some calming effects, its primary use is not as a sedative. Levodopa is mainly prescribed for Parkinson’s disease to help with motor symptoms associated with the disorder, and it does not serve a sedative role. Understanding these distinctions clarifies why the barbiturate is recognized as a sedative in this context.