Sec. 2. For purposes of this chapter, a pharmacist adjusts a drug regimen if the pharmacist:
(1) changes the duration of treatment for a current drug therapy;
(2) adjusts a drug's strength, dosage form, frequency of administration, or route of administration;
(3) discontinues the use of a drug;
(4) adds a drug to the treatment regimen;
(5) issues a new prescription for the purposes of subdivision (1), (2), or (4); or
(6) makes a therapeutic substitution.