The snakebite tourniquet is a way of treating all kinds of venoms quickly by rubbing ground buffalo gourd seeds in the wound while using the tubing to tie off the limb to inoculate against further poisoning. If the player possesses a tourniquet when he/she becomes poisoned by an animal, the tourniquet will be automatically applied to counter the poison.
This item can be crafted by the player.
surgical tubing (1)
Snakebite tourniquet (1)
You can find some in the footlocker after Lonesome Road. Ulysses will also give you a few if you spare him.