A drug delivery safety device (200, 201) comprising a safety needle device (220, 221) comprising a housing body configured to couple to a syringe, the housing body having a proximal end and a distal end, the distal end coupled to a retractable sheath, an opening located on the distal end which receives the retractable sheath, the sheath being movable along a central axis of the housing body, a needle hub is disposed on the proximal end, a needle cannula is attached to the needle hub, a needle support extending from the needle hub to support the needle cannula; and a lockout latch able to clip over the distal tip of the needle cannula upon injection to passively lock out the safety device, characterized in that: the safety needle device having a proximal end of the retractable sheath includes a retention hook that extends radially outward from the proximal end of retractable sheath and is configured to engage an activation latch of the housing body, the retractable sheath being spring loaded, the retention hook is released from the activation latch by depressing the activation latch upon injection; a cap (202, 207) comprising a cap body having a proximal end removably attached to the safety needle device, a distal end having an access protrusion that is in fluid communication with the needle cannula, a cap cannula extends from a distal end of the access protrusion; a recess for accommodating the safety needly device having the activation latch; a finger hilt at a distal end of the cap; and a septum which resides in the distal end of the cap (202, 207); wherein an inside surface of the cap (202, 207) further comprises a fill feature engageable with the safety needle device for maintaining a fill state of the safety needle device, the fill feature includes a rib on an interior surface of a recess of the cap (202, 207) which interacts with one or more activation latch safety features upon assembly to keep it in a fill state. a safety needle device (220, 221) comprising a housing body configured to couple to a syringe, the housing body having a proximal end and a distal end, the distal end coupled to a retractable sheath, an opening located on the distal end which receives the retractable sheath, the sheath being movable along a central axis of the housing body, a needle hub is disposed on the proximal end, a needle cannula is attached to the needle hub, a needle support extending from the needle hub to support the needle cannula; and a lockout latch able to clip over the distal tip of the needle cannula upon injection to passively lock out the safety device, characterized in that: the safety needle device having a proximal end of the retractable sheath includes a retention hook that extends radially outward from the proximal end of retractable sheath and is configured to engage an activation latch of the housing body, the retractable sheath being spring loaded, the retention hook is released from the activation latch by depressing the activation latch upon injection; a cap (202, 207) comprising a cap body having a proximal end removably attached to the safety needle device, a distal end having an access protrusion that is in fluid communication with the needle cannula, a cap cannula extends from a distal end of the access protrusion; a recess for accommodating the safety needly device having the activation latch; a finger hilt at a distal end of the cap; and a septum which resides in the distal end of the cap (202, 207); wherein an inside surface of the cap (202, 207) further comprises a fill feature engageable with the safety needle device for maintaining a fill state of the safety needle device, the fill feature includes a rib on an interior surface of a recess of the cap (202, 207) which interacts with one or more activation latch safety features upon assembly to keep it in a fill state. the safety needle device having a proximal end of the retractable sheath includes a retention hook that extends radially outward from the proximal end of retractable sheath and is configured to engage an activation latch of the housing body, the retractable sheath being spring loaded, the retention hook is released from the activation latch by depressing the activation latch upon injection; a cap (202, 207) comprising a cap body having a proximal end removably attached to the safety needle device, a distal end having an access protrusion that is in fluid communication with the needle cannula, a cap cannula extends from a distal end of the access protrusion; a recess for accommodating the safety needly device having the activation latch; a finger hilt at a distal end of the cap; and a septum which resides in the distal end of the cap (202, 207); wherein an inside surface of the cap (202, 207) further comprises a fill feature engageable with the safety needle device for maintaining a fill state of the safety needle device, the fill feature includes a rib on an interior surface of a recess of the cap (202, 207) which interacts with one or more activation latch safety features upon assembly to keep it in a fill state.