Which ingredient is included in qualifying limits for Schedule IV substances?

The inclusion of diphenoxylate in the qualifying limits for Schedule IV substances reflects its regulatory classification due to its potential for abuse and dependence, similar to other substances in that schedule. Diphenoxylate is primarily used as an antidiarrheal medication, and when combined with atropine, it helps to deter misuse. This schedule's classification allows for the regulation of the drug’s distribution, prescribing, and use, ensuring that it is used safely and effectively while minimizing the risk of addiction or misuse. The qualifying limits for substances in this schedule are intended to balance the therapeutic benefits of the medication with the potential risks, and diphenoxylate falls neatly within this framework.

In contrast, hydrocodone and codeine are classified as Schedule II substances due to their higher abuse potential and are subject to more stringent controls, while ketamine, although often considered for its anesthetic and alternative therapeutic uses, is classified as a Schedule III substance, which indicates a different regulatory approach. Understanding these classifications and the associated limits is essential for safe pharmaceutical practice and compliance with state and federal laws.