Which of the following substances is an example of a Schedule III Controlled Substance?

Vinbarbital is classified as a Schedule III controlled substance under federal and many state regulations, including those in Arkansas. Schedule III substances are considered to have a moderate potential for abuse and have recognized medical uses.

Vinbarbital, a barbiturate, is used primarily for its sedative and anticonvulsant properties. While it is less frequently prescribed today, its medical applications and lower potential for abuse compared to Schedule I and II drugs make it fall into this category.

In contrast, methadone is categorized as a Schedule II controlled substance due to its higher potential for abuse and is often utilized for pain management and in treating opioid dependency. Heroin, classified as a Schedule I substance, has no accepted medical use and poses a significant risk for abuse. Marijuana, while legal for medical use in some states, remains classified as a Schedule I controlled substance at the federal level, indicating it is considered to have a high potential for abuse with no accepted medical applications.

Thus, the classification of substances as Schedule III relies on their potential for abuse and accepted medical uses, which is why vinbarbital accurately fits in this category.