A con artist; someone who pulls confidence games; a swindler, scammer, huckster, hustler, and/or charlatan.
A manipulator or otherwise generally corrupt person who "games" a system, group of people, or other entity for selfish gains; especially of a political "sell-out" perceived as lacking integrity.
One who studies pharmacy.
A health professional who controls, formulates, preserves, and dispenses medications and provides medical advice and counseling on how medicines should be used in order to achieve maximum benefit, and minimal side effects in order to avoid drug interactions.