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 only restore Hit Points; crippled limbs have to be restored with the use of the Doctor skill.
They are plentiful and easy to come by in more civilized areas, although on the outskirts of post-nuclear civilization (such as Klamath or the Den in Fallout 2), they can be quite rare and fetch high prices.
Five stimpaks can be given to the player character by Killian Darkwater as a potential reward for completing the get Gizmo's confession quest.