Final answer:
C3-5 prescriptions can usually only be transferred as refills once the original has been filled, but if pharmacies share a real-time online database, this requirement can be bypassed.
Step-by-step explanation:
In the context of prescription medication regulations, C3-5, or Schedule III to V controlled substances, have specific rules for transfer between pharmacies. Usually, these prescriptions may only be transferred for refill purposes after the original prescription has been filled at least once. However, an exception to this rule exists if the transfer is between pharmacies that share a real-time, online database. In such cases, prescriptions for these controlled substances can be transferred for refills without the need for the initial fill. This facilitates continuity of care if a patient changes their preferred pharmacy or if their usual pharmacy is out of stock.