A safety syringe which includes an outer casing having a closed and an open end, a transition chamber having a closed and an open end, a spring assembly, and a plunger. The transition chamber is held for sliding movement within the outer casing and defines a needle concealment chamber, while the plunger defines a needle receiving chamber and is held for sliding movement within the transition chamber. A liquid medicine chamber within the transition chamber holds a precharged quantity of injectable medicine. The spring assembly is moved from its initial compressed configuration, including a needle within a needle containment chamber, when movement of the plunger and the transition chamber are moved together within the outer casing to extend the needle from a needle exit hole in the end of the outer casing. The medicine is ejected from the needle upon further movement of the plunger within the transition chamber, after which further movement of the plunger within the transition chamber retracts the needle to eject safely into the needle receiving chamber.
