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Caffeine intoxication occurs when a person has dangerously high levels of caffeine in the system. It creates a spectrum of unpleasant and severe symptoms, such as trouble breathing and seizures.

Caffeine blocks a chemical called adenosine, which is what normally makes you feel tired. That’s exactly why your morning Americano gives you that glorious alert-and-focused state of mind.

The Bottom Line For most healthy firefighters, some caffeine is okay! Limit caffeine to 400 milligrams or 30-40 oz of coffee (total).

Caffeine intoxication occurs when a person has dangerously high levels of caffeine in the system. It creates a spectrum of unpleasant and severe symptoms, such as trouble breathing and seizures.

Caffeine intoxication occurs when a person has dangerously high levels of caffeine in the system. It creates a spectrum of unpleasant and severe symptoms, such as trouble breathing and seizures.