Which of the following is a Schedule IV controlled substance?

Schedule IV controlled substances are defined as drugs that have a lower potential for abuse relative to substances in Schedules I-III and may be used for medical purposes. They are characterized by acceptance in medical use and a decreased risk of dependence compared to higher schedules.

Chlordiazepoxide, Halazepam, and Zolpidem all fall under this classification. Chlordiazepoxide is often used for anxiety and has sedative properties, making it a benzodiazepine that fits the criteria for Schedule IV. Halazepam, another benzodiazepine, also has medical uses related to anxiety and sedation. Zolpidem is commonly prescribed for insomnia and is known for its sedative effects.

Since all three substances meet the criteria for Schedule IV, the answer indicating that all of them are Schedule IV controlled substances is indeed correct. Understanding the specific medications and their classifications assists in recognizing their implications for prescription practices, potential for abuse, and management in a clinical setting.