Final answer:
Pharmacies must compile a complete and accurate inventory of their controls on a regular basis, usually every two years. This is required by the Drug Enforcement Administration (DEA) regulations to ensure proper record-keeping and accountability for controlled substances.
Step-by-step explanation:
In the United States, pharmacies are required to compile a complete and accurate inventory of all their controlled substances on a regular basis. According to the Drug Enforcement Administration (DEA) regulations, pharmacies must conduct an inventory of their controlled substances every two years.
Additionally, pharmacies are required to maintain perpetual inventories of their controlled substances, which means they must continuously monitor and record the quantities of these medications on hand.
The purpose of these inventory requirements is to ensure proper record-keeping and accountability for controlled substances, which are medications with a high potential for abuse or dependence.