Stimpak

Stimpaks are a popular healing chem. When injected, the chem provides immediate healing of minor wounds.

Superior versions of this chem (but with some drawbacks) are Super Stimpak and Ultra Stimpak.

Fallout, Fallout 2 and Fallout Tactics
In Fallout, Fallout 2 and Fallout Tactics, stimpaks can only restore Hit Points, but cannot heal crippled limbs.

In Fallout 2, Myron can make these if you give him the proper ingredients:
 * Empty Hypodermic
 * Xander Root
 * Broc Flower

Fallout 3
Unlike previous games, in Fallout 3 they can also be used on crippled limbs to heal them.

Appearances
Stimpaks appear in all Fallout games. Super Stimpaks appear in Fallout, Fallout 2, Fallout Tactics and Fallout: Brotherhood of Steel, while Ultra Stimpaks appear only in Fallout Tactics.