An injection device 110 is provided which includes a syringe having a discharge nozzle 122. The syringe is movable between a retracted position in which the discharge nozzle is contained within the housing 112 and an extended position in which the discharge nozzle 122 extends from the housing 112. A trigger 114 is activatable to allow the contents of the syringe to be discharged through the discharge nozzle 122. There is also a releasable locking mechanism 116 which, when engaged, prevents the trigger 114 from moving into an active position. The trigger 114 includes a first portion 150 having a cut-out 152 which extends from a first end of the trigger 114a in a direction substantially parallel to a first axis. The releasable locking mechanism 116 includes a protrusion 154 along a second axis for communicating with the first portion 150 of the trigger when the releasable locking mechanism 116 is engaged and for communicating with the cut-out 152 when the releasable locking mechanism 116 is disengaged. Such an injection device provides improved protection against accidental activation of the trigger.
