This page covers the 2012 DayZ Mod for Arma 2. For information from DayZ (2018), see Morphine Auto Injector.
The Morphine auto-injector is used to fix broken bones. You can get a broken bone from a zombie, gunshots, falling or closing a door on yourself. To use the injector, first open your inventory with "G". Right click the auto-injector and press the dialog to take the morphine. Your player will perform an animation for about 10 seconds, do not interrupt this animation or you'll have to start again. Once the broken bone icon is removed the process is complete and you will be able to run again. It is suggested to always have one of these in your main inventory because having a broken bone without one will usually result in death or a long crawl to the nearest hospital.
Morphine auto-injectors can be found in medical boxes, hospitals, crashed helicopters, and very rarely in regular loot piles.
Although Morphine is in reality a very strong painkiller, in Dayz it has no effect on Pain.