Abstract: A drug delivery device is disclosed, wherein the device comprises a housing; a product container arranged in the housing; a plunger rod partially disposed inside the product container; and a thumb pad configured to receive a portion of the plunger rod, wherein the thumb pad and the plunger rod are configured to transition from a first state to a second state, wherein at the first state, the plunger rod is prevented from moving in a proximal direction, and at the second state, the plunger rod moves freely in a proximal direction.

Abstract: A vial adapter assembly that includes a housing, a first receptacle formed within the housing and configured to receive a first vial within the housing, and a second receptacle formed within the housing and configured to receive a second vial within the housing. An opening of the first receptacle and an opening of the second receptacle is in fluid communication with the upper surface of the housing. The vial adapter assembly includes a cap that is coupled and movable relative to the housing from a closed configuration to an open configuration. In the closed configuration, the cap is configured to cover the opening of the first receptacle and the opening of the second receptacle on the upper surface. In the open configuration, the cap is configured to uncover the opening of the first receptacle and the opening of the second receptacle, and expose the upper surface.