This syringe is composed of two parts, body and plunger, the latter formed by only one part and has as function the administration of medicines in any clinical practice. It allows a more regular sliding and advancement of the plunger, as well as a better positioning on the desired scale. Then if it is used only once, being sterile and of single use, it must be discarded in a suitable container. It has a capacity of 20 ml and the quantity is equivalent to a package of 80 units.