CSOS can be used to order which schedules?

• A. Schedule II-V only
• B. Schedule I-V
• C. Schedule II only
• D. Schedule I only

Answer: (B)

CSOS is the DEA-approved electronic method for ordering controlled substances, and it is designed to cover the entire range defined by the Controlled Substances Act. That means orders can be placed for substances in all schedules from Schedule I through Schedule V, not just II through V or only a subset. In practice, Schedule I substances aren’t commonly ordered in standard pharmacy operations, but the system itself is capable of handling all schedules if the registrant is authorized and the supplier accepts CSOS orders. So the correct understanding is that CSOS can be used to order substances across all schedules I through V.