An advanced practice registered nurse may: (1) Initiate, monitor, and alter drug therapies; (2) Initiate appropriate therapies or treatments; (3) Make referrals for appropriate therapies or treatments; (4) Perform additional functions within his or her specialty determined in accordance with rules and regulations promulgated by the Mayor; and (5) Sign, certify, stamp, or endorse all documents that require a signature by a physician, in place of a physician, provided it is within the scope of their authorized practice.