By itself, the empty hypodermic has no function. However, if you give this item to Myron, along with a broc flower and a xander root you will receive a stimpak, also if you have a fruit and Nuka-Cola you can make a super stimpak.
Appearances[]
The empty hypodermic appears in Fallout 2. It can also be found in Fallout: New Vegas as the empty syringe.