§ 120. Creation; board; employees. The governing body of each city having a population of fifty thousand or more is hereby authorized to create a city drug control authority. Such authority shall consist of not less than five nor more than nine members who shall be appointed by the governing body of the city, at least one of whom shall be a physician licensed to practice medicine in this state. Any person serving as a member of a city narcotic guidance council, community board narcotic guidance council in the city of New York, drug abuse commission or mental health board shall be eligible to serve as a member of the board of a city drug authority created pursuant to this article. The chairman of the board shall be designated by the governing body of the city from among the members so appointed. The compensation of the members shall be fixed by the governing body of the city within the amount available therefor by appropriation. The board shall appoint a counsel, an administrative officer and such other officers, employees, agents and consultants as may be necessary, prescribe their duties, fix their compensation and provide for payment of their expenses, all within amounts appropriated therefor by the city.