The station comes in two forms, both of which can be crafted in player settlements. It is unclear what exactly this level maximum is and whether or not it is partially dependent on one's own level, but it seems that even at high levels (40+) only enemies less than around level 20 can be affected. Going for a kill-free run through of Fallout 4? To craft a syringe, head over to a chem crafting table, like the one in Sanctuary Hills.
