Abstract: A disposable hypodermic syringe is provided having a needle carrier that is retractable into the barrel by the plunger after use for anti-pricking protection. Additionally the needle carrier is locked to the plunger to prevent any further use of the syringe. After the needle carrier is locked into the rectractable position, the plunger may be broken off even with the barrel so that the needle may not be accidentally pushed out of the barrel and become exposed.