Stim-pack

Stimulation Packs are a type of drug used by UNSC marines.

Background
They 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 other, more powerful drugs.

After four days of straight fighting during the Battle of Installation 04, even the Master Chief relied on these to get him through.

Trivia

 * They are alternatively known as "Stim-Packs" or "Wake-up stims".

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