A person licensed under the laws of this state to practice medicine may delegate to a physician assistant licensed by the board pursuant to section 12-36-107.4 the authority to perform acts that constitute the practice of medicine and acts that physicians are authorized by law to perform to the extent and in the manner authorized by rules promulgated by the board, including the authority to prescribe medication, including controlled substances, and dispense only the drugs designated by the board. Such acts must be consistent with sound medical practice. Each prescription for a controlled substance, as defined in section 18-18-102 see full law