A guard for the sharp tip of a needle of an injection syringe. The guard may comprise two components which are separate from and readily attachable to the syringe. One component is stationary and the other movable relative to the syringe. The movable member moves by expanding longitudinally to cover the otherwise exposed needle tip when the plunger of the syringe is depressed beyond a predetermined degree. The stationary member releasably holds the movable member in the initial position, and releases the movable member to expand and thus deploy when the predetermined degree of depression is imposed by the user of the syringe.
