A system includes a vial access device including a vial access housing having a wall defining an elongate opening between an opening proximal end and an opening distal end, the vial access housing including a spike and a vial connection element attachable to a first vial defining a first vial size to secure the vial access device to the first vial, and an adapter movable within the elongate opening of the vial access housing. The adapter is transitionable between a first position where the adapter is adjacent the opening distal end of the vial access housing and the adapter is attachable to a second vial defining a second vial size and a second position where the adapter is adjacent the opening proximal end of the vial access housing and the vial connection element of the vial access device is attachable to the first vial.
