Stimpaks are a type of hand held medication used to heal 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, delivering between 30-90 hit points (36–108 hit points with the Fast Metabolismperk) per injection, dependent on the level of the player's Medicine skill.
Additionally, it can be used to heal crippled limbs by injecting it directly into the affected limb (via the PipBoy interface). When used on a limb it heals a relatively high amount of damage on the limb, but slight healing on the body. Conversely, when used on the whole body, a relatively high amount of damage on the whole body is healed, but the limbs are healed only slightly.