A retractable needle syringe, including a needle stem and breakable ring having a plurality of fingers and grooves. These fingers and grooves are configured to mate with a plurality of ribs and grooves in a syringe barrel distal end to provide anti-rotation of the needle stem with respect to a syringe barrel. This anti-rotation feature restricts rotation of the needle stem when attaching or exchanging needles to prevent unintended retraction.
