Final answer:
The required annual review by a Joint Commission accredited organization for a medication's continued use is a formulary review, which evaluates the drug's safety, efficacy, and cost-effectiveness.
Step-by-step explanation:
For a Joint Commission accredited organization, the required annual review to ensure a medication's continued use is a. Formulary review. This process involves the continuous evaluation of drugs on the organization's formulary to ensure that they remain the best choice for patient care. The formulary committee, often comprising pharmacists and physicians, critically assesses a medication's efficacy, safety, and cost-effectiveness. As part of pharmacovigilance, this ongoing review process addresses the need to monitor a drug's performance as a more significant number of patients use it, assessing long-term safety and effectiveness in various patient subgroups.