An injection device (110) is provided which includes a syringe (122) having a discharge nozzle (118). The syringe is movable between a retracted position in which the discharge nozzle is contained within the housing and an extended position in which the discharge nozzle extends from the housing. A trigger (114) is activatable to allow the contents of the syringe to be discharged through the discharge nozzle. There is also a releasable locking mechanism (116) which, when engaged, prevents the trigger from moving into an active position. The trigger includes a first portion (150) having a cut-out (152) which extends from a first end of the trigger in a direction substantially parallel to the first axis (101). The releasable locking mechanism includes a protrusion (154) along a second axis (181) for communicating with the first portion of the trigger when the releasable locking mechanism is engaged and for communicating with the cut-out when the releasable locking mechanism is disengaged. Such an injection device provides improved protection against accidental activation of the trigger.
