Which form of chlordiazepoxide is categorized as Schedule IV?

Chlordiazepoxide is classified as a Schedule IV controlled substance due to its potential for abuse and dependence. Among the options given, Librium is the brand name for chlordiazepoxide used primarily to treat anxiety and acute alcohol withdrawal. Being a formulation of chlordiazepoxide, Librium falls under the same regulatory category as its generic counterpart, deeming it a Schedule IV substance.

Librax is a combination medication that includes chlordiazepoxide but also contains an anticholinergic, thus it may have different considerations in terms of classification. Menrium is not a widely recognized name related to chlordiazepoxide, and Chlordiazepoxide Combination could refer to various formulations that may incorporate chlordiazepoxide with other active ingredients, but the specific classification may depend on those additional elements.

In this context, Librium is the established brand name directly associated with chlordiazepoxide itself and its classification as Schedule IV, making it the correct answer.