Hydra

 is a consumable item in Fallout: New Vegas.

Characteristics
Hydra is similar to a Doctor's Bag in that it restores limb damage, however Hydra slowly restores damage over time unlike the Doctor's Bag, which takes effect immediately. It also heals all limbs at once. In hardcore mode, Hydra is superior to the Doctor's Bag, which only partially heals a single damaged limb, or heals all limbs for a tiny amount.

This item is crafted over a campfire. You will need Cave fungus (5), Night Stalker Blood (3), and Radscorpion Poison Gland (2).

It requires 75 survival skill to be crafted, otherwise it can occasionally be found in first aid boxes or bought from chem vendors.

The player character can become addicted to Hydra. The name may be a reference to the mythical beast the Hydra which had 9 heads, one was invincible.