Adhesive assemblies and microneedle injection apparatuses comprising same. The apparatus (100) can include a housing (102) having a base (114) and an opening (115) formed in the base that defines an area (A)； and an applicator (103) comprising a microneedle array (104), the microneedle array comprising a first major surface (111) and microneedles (105). The applicator can be movable between a first position, and a second position in which at least a portion of the microneedle array extends through the opening in the base and beyond the base. The apparatus can further include an adhesive assembly (118), which can be adhered to the base of the housing. The adhesive assembly can include an extension (125) that extends at least partially into the area defined by the opening, such that when the applicator is in the second position, at least a portion of the first major surface of the microneedle array is in contact with the extension of the adhesive assembly wherein the applicator is configured to be moved from the first position to the secondposition at a velocity of at least 5 m/s.
