Practitioner means: (1) A physician, dentist, veterinarian, podiatrist, scientific investigator or other person registered to distribute, dispense, prescribe, conduct research with respect to, or use in teaching or chemical analysis, a controlled substance in the course of professional practice or research in the commonwealth; see full law

(A) A registered individual practitioner may in the course of professional practice dispense to an ultimate user the following:(1) A Schedule VI sample medication in a single dose or in such quantity as is in the opinion of the registered individual practitioner appropriate for the treatment of the patient but not exceeding a 30 day supply per dispensing; provided, however that this quantity may be increased to a 90 day supply if dispensed as part of an indigent patient drug program and deemed appropriate in the professional judgement of the practitioner;(2) A Schedule II through V sample medication in a single dose or in such quantity as in the opinion of the registered individual practitioner is essential for the immediate treatment of the patient. see full law