Final answer:
The drugs return logbook must include several key details such as drug name, dosage, quantity, date of return, and details of the person returning the drug. Retention period of this log varies by jurisdiction but is commonly at least 2 years.
Step-by-step explanation:
When any drugs are returned within or by an institution, there are certain details that must be recorded in a logbook. These details typically include the name of the drug, its strength and dosage form, the quantity returned, the date of return, the name of the person or entity returning the drug, and the reason for the return. As for the retention period, institutions are generally required to keep this log for a specific time, which can vary by jurisdiction, but is often a minimum of 2 years after the record is made. It's crucial to check with the local regulations to ensure compliance with the specific record-keeping requirements for drug returns.