Which of the following drugs is considered a Schedule V drug?

Ezogabine is classified as a Schedule V drug because it has a lower potential for abuse relative to the substances classified in higher schedules. Schedule V drugs are accepted for medical use and are known to have a limited likelihood of dependence and abuse. Ezogabine, which is used as an anticonvulsant, meets these criteria due to its specific therapeutic applications and the lower risk of psychological or physical dependence associated with its use.

In contrast, Dilaudid (hydromorphone) and fentanyl are classified as Schedule II substances because they have a high potential for abuse, leading to severe psychological or physical dependence. Opium, while it does have medicinal uses, is also classified as a Schedule II drug due to its potential for misuse and addiction. Thus, the characteristics of ezogabine align with the criteria for Schedule V classification, distinguishing it from the more tightly controlled substances in the other choices.