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A microneedle injection apparatus comprising a dual cover. The apparatus can include a housing having a base and a cavity; a microneedle array comprising a first side comprising a plurality of microneedles; and a microneedle array holder configured to hold a microneedle array and located in the hous

A microneedle injection apparatus comprising a dual cover. The apparatus can include a housing having a base and a cavity; a microneedle array comprising a first side comprising a plurality of microneedles; and a microneedle array holder configured to hold a microneedle array and located in the housing. The microneedle array holder can be movable between a retracted position, and an extended position. The apparatus can further include a cover (113) configured to be positioned to cover the opening (115) in the base (112) of the housing. The cover can include (i) a first portion (140) configured to cover at least a portion of the base of the housing adjacent the opening, and (ii) a second portion (142) configured to be received in the cavity of the housing and further configured to cover the plurality of microneedles on the microneedle array when the microneedle array holder is in the retracted position.

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1. A microneedle injection apparatus comprising: a housing having a base and a cavity that extends through the base to define an opening in the base, wherein the base of the housing is configured to be positioned toward a skin surface;a microneedle array comprising a first side comprising a pluralit

1. A microneedle injection apparatus comprising: a housing having a base and a cavity that extends through the base to define an opening in the base, wherein the base of the housing is configured to be positioned toward a skin surface;a microneedle array comprising a first side comprising a plurality of microneedles;a microneedle array holder configured to hold a microneedle array and located in the housing, the microneedle array holder movable with respect to the opening in the base of the housing between a retracted position in which the microneedle array is recessed within the housing such that the microneedle array does not contact the skin surface when the apparatus is positioned on the skin surface and the microneedle array is coupled to the microneedle array holder, andan extended position in which at least a portion of the microneedle array is positioned to contact the skin surface via the opening when the apparatus is positioned on the skin surface and the microneedle array is coupled to the microneedle array holder;a cover configured to be positioned to cover the opening in the base of the housing, the cover including a first portion configured to cover at least a portion of the base of the housing adjacent the opening, anda second portion configured to be received in the cavity of the housing and further configured to cover the plurality of microneedles on the microneedle array when the microneedle array holder is in the retracted position; andwherein the microneedle injection apparatus further includes an actuator movable with respect to the housing between a first position and a second position to cause the microneedle array holder to move from the retracted position to the extended position, wherein, at least when the actuator is in the first position, at least a portion of the actuator protrudes from the opening in the base of the housing and defines a base configured to be coupled to the skin surface, and wherein the cover is configured to cover at least the base of the actuator, wherein the cover is removable from the remainder of the apparatus, and wherein when the cover is coupled to the apparatus, the cover is positioned to prevent the actuator from being moved to its second position. 2. The apparatus of claim 1, wherein the cover is configured to be coupled to the housing. 3. The apparatus of claim 1, wherein at least a portion of the base of the housing adjacent the opening includes a skin-contact adhesive, and wherein the cover is configured to cover at least the portion of the base including the skin-contact adhesive. 4. The apparatus of claim 1, wherein at least a portion the base of the housing adjacent the opening includes a skin-contact adhesive and further comprising a release liner coupled to the skin-contact adhesive on the base of the housing, the cover configured to cover at least the portion of the base of the housing including the release liner. 5. The apparatus of claim 1, wherein the second portion of the cover is configured to extend through the opening in the base of the housing and into the cavity of the housing. 6. The apparatus of claim l any of claims 1, wherein the first portion of the cover includes a recess dimensioned to receive at least a portion of the base of the housing. 7. The apparatus of claim 1, wherein the second portion of the cover includes a recess dimensioned to receive the plurality of microneedles protruding from a first surface on the first side of the microneedle array. 8. The apparatus of claim 7, wherein the recess in the second portion of the cover is defined by an inner surface, and wherein the inner surface of the cover and the first side of the microneedle array together define a chamber for housing the plurality of microneedles prior to use. 9. The apparatus of claim 8, wherein the chamber is a sterile chamber. 10. The apparatus of claim 1, wherein the second portion of the cover includes a microneedle-facing recess, and wherein the first side of the microneedle array includes a cover-facing recess, and further comprising a sealing member dimensioned to be received in the microneedle-facing recess and the cover-facing recess. 11. The apparatus of claim 10, wherein the sealing member is configured to be coupled to at least one of the microneedle array and the microneedle array holder to define a chamber for housing the plurality of microneedles prior to use. 12. The apparatus of claim lany of claims 1, wherein the first portion of the cover is configured to protect at least the portion of the base of the housing configured to be coupled to the skin surface. 13. The apparatus of claim lany of claims 1, wherein the second portion of the cover is configured to be coupled to at least one of the microneedle array and the microneedle array holder. 14. The apparatus of claim 1, wherein the housing includes a protrusion that defines the base of the housing, and wherein the first portion of the cover includes a recess dimensioned to receive the protrusion of the housing.