Final answer:
When a pharmacy can't fully fill a prescription for a Schedule 2 drug, they may provide a partial fill and must supply the rest within 72 hours or notify the prescribing practitioner.
Step-by-step explanation:
If a pharmacy cannot fully fill a Schedule 2 drug prescription, they are allowed to provide a partial fill of the medication. However, they must then provide the remaining portion of the prescription to the patient within 72 hours. If the pharmacy is unable to supply the remaining medication within the 72-hour period, the pharmacist must notify the prescribing practitioner. The practitioner may then issue a new prescription for the patient if necessary.