A medicated module attachable to a drug delivery device, the drug delivery device having a drug reservoir holding a first medicament, the medicated module comprising: an outer body, a second medicament; a proximal needle at the outer body, wherein the proximal needle is configured to establish fluid communication with the drug reservoir of the drug delivery device when the medicated module is attached to the drug delivery device; and a distal needle configured to act as an output needle, through which the dose of the first medicament and the second medicament can be injected, characterized in that the outer body houses a rotatable reservoir body, wherein the rotatable reservoir body is rotatable with respect to the outer body, wherein the rotatable reservoir body comprises (i) a flow path travelling from a proximal end to a distal end of the rotateable reservoir body and (ii) a medicament-reservoir profile; wherein the rotatable reservoir body is axially fixed to the outer body and wherein the distal needle is attached to the rotatable reservoir body; that a pin feature is disposed in the rotatable reservoir body, the pin feature comprising a medicament-cavity profile and a bypass flow path, wherein the pin feature is rotationally fixed to the outer body; that the second medicament is held in a reservoir region formed at least in part by the medicament-reservoir profile and the medicament-cavity profile, wherein, prior to dispense, the second medicament is filled to at least a proximal end of the medicament-cavity profile; and that the rotatable reservoir body is configured to rotate with respect to the pin feature from a priming mode to an injection mode such that (i) prior to dispense, (a) the bypass flow path is initially in communication with the flow path such that the drug delivery device may be primed with the first medicament by forcing a priming dose of the first medicament through the bypass flow path and (b) the medicament-cavity profile is in communication with the reservoir profile; and such that (ii) during dispense, the medicament-cavity profile is in communication with the flow path such that the first and the second medicament may be delivered through the distal injection needle. an outer body, a second medicament; a proximal needle at the outer body, wherein the proximal needle is configured to establish fluid communication with the drug reservoir of the drug delivery device when the medicated module is attached to the drug delivery device; and a distal needle configured to act as an output needle, through which the dose of the first medicament and the second medicament can be injected, characterized in that the outer body houses a rotatable reservoir body, wherein the rotatable reservoir body is rotatable with respect to the outer body, wherein the rotatable reservoir body comprises (i) a flow path travelling from a proximal end to a distal end of the rotateable reservoir body and (ii) a medicament-reservoir profile; wherein the rotatable reservoir body is axially fixed to the outer body and wherein the distal needle is attached to the rotatable reservoir body; that a pin feature is disposed in the rotatable reservoir body, the pin feature comprising a medicament-cavity profile and a bypass flow path, wherein the pin feature is rotationally fixed to the outer body; that the second medicament is held in a reservoir region formed at least in part by the medicament-reservoir profile and the medicament-cavity profile, wherein, prior to dispense, the second medicament is filled to at least a proximal end of the medicament-cavity profile; and that the rotatable reservoir body is configured to rotate with respect to the pin feature from a priming mode to an injection mode such that (i) prior to dispense, (a) the bypass flow path is initially in communication with the flow path such that the drug delivery device may be primed with the first medicament by forcing a priming dose of the first medicament through the bypass flow path and (b) the medicament-cavity profile is in communication with the reservoir profile; and such that (ii) during dispense, the medicament-cavity profile is in communication with the flow path such that the first and the second medicament may be delivered through the distal injection needle.