A practitioner specified in Section 11150 may dispense directly to an ultimate user a controlled substance classified in Schedule II in an amount not to exceed a 72-hour supply for the patient in accordance with directions for use given by the dispensing practitioner only where the patient is not expected to require any additional amount of the controlled substance beyond the 72 hours. Practitioners dispensing drugs pursuant to this subdivision shall meet the requirements of subdivision (f) of Section 11164. see full law