Which muscle relaxant is classified as a scheduled medication?

Valium, which is a brand name for diazepam, is classified as a scheduled medication because it is a benzodiazepine that has the potential for abuse and dependence. This classification means it is regulated under the Controlled Substances Act. As a Schedule IV controlled substance, Valium can lead to physical or psychological dependence but is considered to have a lower potential for abuse compared to substances classified as Schedule I, II, or III.

In contrast, the other options—Robaxin (methocarbamol), cyclobenzaprine, and baclofen—are not classified as controlled substances and therefore do not carry the same level of regulatory control. Robaxin and baclofen are muscle relaxants that are generally used for acute pain and muscle spasms but have no high potential for dependency. Cyclobenzaprine is primarily used as a short-term treatment for muscle spasms due to its sedative effects, but it also is not a controlled substance. Thus, among the given choices, Valium is the only muscle relaxant that requires additional regulation due to its potential for abuse and dependence.