Final answer:
Upon finding clinically significant problems in the Drug Regimen Review (DRR) for a Class A pharmacy, the pharmacist should take appropriate action to address them.
Step-by-step explanation:
A pharmacist conducting a Drug Regimen Review (DRR) for a Class A pharmacy shall take necessary action to resolve any clinically significant issues that are discovered. This could entail speaking with the prescribing physician to go over alternatives, alerting the patient and suggesting any required prescription modifications or changes, or working with the pharmacy's medical staff to create a strategy. Ensuring patients receive safe and effective medication therapy is the pharmacist's main duty.