A container (400, 500) for delivering a medicament to a target location, comprising: a housing (10, 10', 11) comprising a proximal end and a distal end; a vial comprising a proximal end and a distal end, the vial configured to contain a medicament, said vial configured to move relative to the housing (10, 10', 11); an injection member associated with the distal end of the vial, such that medicament delivered from the vial passes through the injection member to the target location; a plunger slidable within the vial from the proximal end to the distal end of the vial to dispel the medicament from the vial; a plunger rod (21, 23) comprising a proximal end and a distal end, wherein application of a force to the plunger rod (21, 23) causes the vial to move toward the distal end of the housing (10, 10',11) delivering the injection member, upon reaching a threshold resistance force wherein at least one resistance feature associated with the plunger rod (21, 23) allows the plunger rod (21, 23) to slide within the vial toward the distal end of the vial to deliver the medicament there within, wherein the housing (10, 10', 11) further comprises a cap locking tab at its distal end; wherein the housing further comprises a slidable interaction member associated with the distal end of the vial, the slidable interaction member configured to slide with the vial, and a safety cap comprising a cap groove, the safety cap configured to interact with the distal end of the housing (10, 10', 11), wherein sliding the plunger toward the distal end of the housing (10, 10', 11) moves the vial toward the distal end of the housing (10, 10', 11), such that the injection member traverses the target area, further sliding of the plunger toward the distal end of the housing (10, 10', 11) slides the plunger to the distal end of the vial, such that medicament within the vial is delivered through the injection member, the slidable interaction member interacts with the cap locking tab, biasing the cap locking tab outward, such that adjoining the safety cap to the distal end of the housing (10, 10', 11) causes the cap groove to interact with the cap locking tab, preventing removal of the safety cap after use of the container (400, 500). a housing (10, 10', 11) comprising a proximal end and a distal end; a vial comprising a proximal end and a distal end, the vial configured to contain a medicament, said vial configured to move relative to the housing (10, 10', 11); an injection member associated with the distal end of the vial, such that medicament delivered from the vial passes through the injection member to the target location; a plunger slidable within the vial from the proximal end to the distal end of the vial to dispel the medicament from the vial; a plunger rod (21, 23) comprising a proximal end and a distal end, wherein application of a force to the plunger rod (21, 23) causes the vial to move toward the distal end of the housing (10, 10',11) delivering the injection member, upon reaching a threshold resistance force wherein at least one resistance feature associated with the plunger rod (21, 23) allows the plunger rod (21, 23) to slide within the vial toward the distal end of the vial to deliver the medicament there within, wherein the housing (10, 10', 11) further comprises a cap locking tab at its distal end; wherein the housing further comprises a slidable interaction member associated with the distal end of the vial, the slidable interaction member configured to slide with the vial, and a safety cap comprising a cap groove, the safety cap configured to interact with the distal end of the housing (10, 10', 11), wherein sliding the plunger toward the distal end of the housing (10, 10', 11) moves the vial toward the distal end of the housing (10, 10', 11), such that the injection member traverses the target area, further sliding of the plunger toward the distal end of the housing (10, 10', 11) slides the plunger to the distal end of the vial, such that medicament within the vial is delivered through the injection member, the slidable interaction member interacts with the cap locking tab, biasing the cap locking tab outward, such that adjoining the safety cap to the distal end of the housing (10, 10', 11) causes the cap groove to interact with the cap locking tab, preventing removal of the safety cap after use of the container (400, 500).