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Stimulation Packs, also known as Stim-Packs, are a type of drug used by UNSC Marines.


Stim-Packs are taken orally and designed to "wake up" the user with stimulant drugs. This is primarily used on the battlefield after extended periods of combat, when fatigue starts to set in. It is unclear what drugs are contained in the stim-pack, but they appear to be stronger than caffeine (used in coffee), yet not as addictive as more powerful drugs.

After four days of straight fighting during the Battle of Installation 04, even John-117 relied on these to get him through while fighting the Flood in the Library.[1]


  • At the beginning of Halo: Combat Evolved, the crew member assisting the Master Chief mentions that he gave him a "double dose of the wake-up stim".


  1. Halo: The Flood - page 169

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