(b) No licensee shall be found to have committed unprofessional conduct within the meaning of this section if, at the time the drugs were prescribed, dispensed, or furnished, any of the following applies:

1. (1) The licensee was a designated physician and surgeon or podiatrist serving in the absence of the patient’s physician and surgeon or podiatrist, as the case may be, and if the drugs were prescribed, dispensed, or furnished only as necessary to maintain the patient until the return of the patient’s practitioner, but in any case no longer than 72 hours.

2. (2) The licensee transmitted the order for the drugs to a registered nurse or to a licensed vocational nurse in an inpatient facility, and if both of the following conditions exist:

   1. (A) The practitioner had consulted with the registered nurse or licensed vocational nurse who had reviewed the patient’s records.
   2. (B) The practitioner was designated as the practitioner to serve in the absence of the patient’s physician and surgeon or podiatrist, as the case may be.
3. (3) The licensee was a designated practitioner serving in the absence of the patient’s physician and surgeon or podiatrist, as the case may be, and was in possession of or had utilized the patient’s records and ordered the renewal of a medically indicated prescription for an amount not exceeding the original prescription in strength or amount or for more than one refill.
4. (4) The licensee was acting in accordance with Section 120582 of the Health and Safety Code.