A medicated module for an injection system to co-deliver at least two medicaments is disclosed. The drug delivery device includes a push rod operably connected to a dose dial button. The medicated module includes a housing having a connector configured for attachment to the drug delivery device, and the housing is configured to receive a portion of the push rod when the medicated module is attached to the drug delivery device. The medicated module further includes a reservoir in the housing comprising a single dose of a medicament and a needle guard operably connected to the housing and configured to move in an axial direction during application to an injection site. Still further, the medicated module includes a sleeve in the housing configured to move axially in the housing and a locking collar in the housing configured to move axially and rotationally in the housing.
