Final answer:
The correct ODB override code for a patient warned about potential drug interactions is d) O5. This code is crucial for pharmacy safety checks and patient education on medication use.
Step-by-step explanation:
The ODB (Ontario Drug Benefit) override code used to indicate that a patient has been warned about potential drug interactions associated with their prescription is: d) O5. When a pharmacist enters this code into the system, it signifies that the patient has been advised regarding potential interactions between the newly prescribed medication and their current medications or health conditions. It's part of the safety checks pharmacists perform to ensure the appropriate use of medications.