Final answer:
The PIC of a hospital pharmacy should perform a controlled substances inventory regularly, usually every two years.
Step-by-step explanation:
The PIC (Person in Charge) of a hospital pharmacy should perform a controlled substances inventory regularly to ensure the proper management and control of controlled substances.
The frequency of the inventory depends on the regulations and guidelines set by the governing bodies. In the United States, for example, the Drug Enforcement Administration (DEA) requires that a complete inventory of all controlled substances be conducted every two years.
However, it's important to note that certain states or healthcare organizations may have more stringent requirements and may require more frequent inventories to be conducted.