UFO: Afterlight wiki

Ultracofeine strongly increases a character’s intuition and also slightly increases his or her willpower for the duration of combat. Unfortunately, after its positive effects wears out, some negative after effects develops.

Ultracofeine can be loaded into a medkit. Only scientists with major Medicine training can use it.

Note: Aiming, Manipulation and Charisma is no changed at all. Speed is highest affected, can jump 4 step from Supernatural, to divine, extra, ultra divine, to Galactic, and other skills are raised one or two steps. Unsure if it's changed in various patch, because that's not fit with its description at all. Most suitable for running melee fighter who need to get in fast.

It seem Ultracoffeine used the effect of Martamphetamine instead.