A reconstitution assembly comprising a first container and a second container, the assembly being suitable for reconstituting a medication contained in the first container with a diluent contained in the second container, the first container including a first opening sealed with a first penetrable seal cap, the second container including a second opening including a second penetrable seal cap, the assembly further comprising: (a) a housing (12, 20, 30) forming a passageway, at least a portion of the first container disposed within the passageway, the housing moveably retaining the first container in a first resting position, at least a portion of the second container disposed in the passageway, the first and second containers (70, 80) arranged such that the first opening of the first container faces the second opening of the second container; (b) a transfer set assembly attached to the housing and positioned between the first container and the second container, the transfer set assembly including a first spike extending toward the first penetrable seal cap and a second spike extending toward the second penetrable seal cap, the assembly forming a fluid path extending through at least a portion of the first spike and a portion of the second spike, the first spike not penetrating the first seal cap when the first container is in the first resting position; and (c) a triggering mechanism configured to engage the second container and including a plurality of fingers (102, 104, 106) extending within the passageway to releasably engage the housing and maintain the second container in a second resting position with the second seal not penetrated by the second spike, the fingers configured to be engaged by the first container when the first container moves past a first activated position with at least a portion of the first spike penetrating the first seal cap to establish fluid communication between the interior of the first container and the flow path, the engagement of the first container to the fingers disengaging the fingers from the housing sufficiently to allow the second container to move toward the first container to a second activated position with at least a portion of the second spike penetrating through the second seal cap to establish fluid communication with the flow path. (a) a housing (12, 20, 30) forming a passageway, at least a portion of the first container disposed within the passageway, the housing moveably retaining the first container in a first resting position, at least a portion of the second container disposed in the passageway, the first and second containers (70, 80) arranged such that the first opening of the first container faces the second opening of the second container; (b) a transfer set assembly attached to the housing and positioned between the first container and the second container, the transfer set assembly including a first spike extending toward the first penetrable seal cap and a second spike extending toward the second penetrable seal cap, the assembly forming a fluid path extending through at least a portion of the first spike and a portion of the second spike, the first spike not penetrating the first seal cap when the first container is in the first resting position; and (c) a triggering mechanism configured to engage the second container and including a plurality of fingers (102, 104, 106) extending within the passageway to releasably engage the housing and maintain the second container in a second resting position with the second seal not penetrated by the second spike, the fingers configured to be engaged by the first container when the first container moves past a first activated position with at least a portion of the first spike penetrating the first seal cap to establish fluid communication between the interior of the first container and the flow path, the engagement of the first container to the fingers disengaging the fingers from the housing sufficiently to allow the second container to move toward the first container to a second activated position with at least a portion of the second spike penetrating through the second seal cap to establish fluid communication with the flow path.