A needle assembly for use with a drug delivery devicecomprises:a capreleasably securedto the drug delivery device；a blockingmember comprising a disinfectant swab and a user graspable portion and configured to be physically moved with respect to the needle assembly by a user. The needle assembly is configured such that: in an initial position the blocking member blocks the cap from being removed from the drug delivery device； and movementof theblockingmemberfrom the initial position causes the disinfectant swab to contact a septum of a cartridge retained within the drug delivery device.
