A housing for a drug delivery device comprising: a first receiving section for retaining a primary drug delivery assembly with a primary dose setting mechanism to set a dose of a primary medicament and a primary dose dispense mechanism to dispense a set dose of the primary medicament; and a second receiving section for retaining a secondary drug delivery assembly with a secondary dose setting mechanism to set a dose of a secondary medicament and a secondary dose dispense mechanism to dispense a set dose of the secondary medicament; an actuator arranged such that it is movable along a first longitudinal axis and comprising a first engagement section, wherein the actuator is configured to actuate the primary dose dispensing mechanism by an actuation movement such that the primary medicament is delivered; a lever actuatable setting element located in the second receiving section, characterized by an actuation collar comprising a second engagement section, wherein the setting element is configured to be coupled to the secondary dose setting mechanism such that a setting movement of the setting element around a second longitudinal axis from a first position into a second position leads to the setting of a dose in the secondary drug delivery assembly wherein the actuation collar is configured to actuate the secondary dose dispensing mechanism when the actuation movement is transferred to the actuation collar such that the secondary medicament is delivered, and wherein the setting element drives the actuation collar into engagement with the actuator during the setting movement, wherein in the first position of the setting element the actuator is free to move relative to the actuation collar and in the second position of the setting element the actuation collar engages the actuator such that the actuation movement of the actuator is transferred to the actuation collar. a first receiving section for retaining a primary drug delivery assembly with a primary dose setting mechanism to set a dose of a primary medicament and a primary dose dispense mechanism to dispense a set dose of the primary medicament; and a second receiving section for retaining a secondary drug delivery assembly with a secondary dose setting mechanism to set a dose of a secondary medicament and a secondary dose dispense mechanism to dispense a set dose of the secondary medicament; an actuator arranged such that it is movable along a first longitudinal axis and comprising a first engagement section, wherein the actuator is configured to actuate the primary dose dispensing mechanism by an actuation movement such that the primary medicament is delivered; a lever actuatable setting element located in the second receiving section, characterized by an actuation collar comprising a second engagement section, wherein the setting element is configured to be coupled to the secondary dose setting mechanism such that a setting movement of the setting element around a second longitudinal axis from a first position into a second position leads to the setting of a dose in the secondary drug delivery assembly wherein the actuation collar is configured to actuate the secondary dose dispensing mechanism when the actuation movement is transferred to the actuation collar such that the secondary medicament is delivered, and wherein the setting element drives the actuation collar into engagement with the actuator during the setting movement, wherein in the first position of the setting element the actuator is free to move relative to the actuation collar and in the second position of the setting element the actuation collar engages the actuator such that the actuation movement of the actuator is transferred to the actuation collar.