If a pharmacist dispenses a different quantity than prescribed, what must they document?

When a pharmacist dispenses a different quantity of medication than what was prescribed, it is essential to document the quantity dispensed. This documentation serves several important purposes. Firstly, it ensures transparency and accountability in the dispensing process, allowing for a clear record that can be referred to in case of any questions or concerns about the medication provided. Secondly, accurate documentation aids in maintaining patient safety, as it can help prevent potential medication errors or confusion about the treatment plan. It also allows for proper communication among healthcare providers involved in the patient's care, facilitating better coordination and understanding of the patient's medication regimen.

The other options do not provide relevant information required for documenting changes in the quantity dispensed. The pharmacist’s favorite brand, the drug’s expiration date, and the patient’s insurance information do not directly pertain to the quantity of the medication dispensed and thus are considered unnecessary for this specific documentation requirement.