(a) No pharmacist shall be authorized to modify drug therapy pursuant to Code Section 43-34-26.2 unless that pharmacist:

(1) Is licensed to practice as a pharmacist in this state;

(2) Has successfully completed a course of study regarding modification of drug therapy and approved by the board;

(3) Annually successfully completes a continuing education program regarding modification of drug therapy and approved by the board; and

(4) Is certified by the board as meeting the requirements of paragraphs (1) through (3) of this subsection.

(b) Nothing in this Code section shall be construed to expand or change any existing authority for a pharmacist to substitute drugs.