Stimpak, or stimulation delivery package, is a type of hand-held medication used for healing the body. This item consists of a syringe for containing and delivering the medication and a gauge for measuring the status of the stimpak's contents. When the medicine is injected, it provides immediate healing of the body's minor wounds.
Stimpaks are used to heal 50% of a vault dweller's health, however they cannot heal any radiation damage done to the dwellers, which is marked with a red bar, until it has been removed with RadAway. They can be given to vault dwellers who are sent to explore the wasteland, who will automatically use them when their health gets too low.