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The Syringe is a consumable item that can be found throughout the Lab environment in resource containers as well as on shelves or desks. They come in two different forms, a yellow one called 'IIX' and a red one called I2-LP Syringe (both of these syringes are mentioned in the first log of Rundown 003).
Using an IIX syringe provides a 3x melee damage multiplier for 8 seconds. They also give the player between 3% - 10% infection when used.
Using an IIX syringe allows you to kill any giant enemy with one fully charged hit to the back of the head with any melee, except for the Kovac Peacekeeper Bat (or the Mastaba Fixed Blade Knife if they are awake). Player health will appear yellow for the duration of the syringe's effects.