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Is it possible to overdose on caffeine? How much would you have to take? drug-abuse Drug AbuseExcessive amounts of caffeine intake may poison the body. caffeine CaffeineCaffeine is a stimulant drug most commonly found in coffee, tea, energy drinks, and other supplements. |
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Yes. People die every year from caffeine poisoning. |
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You can overdose on caffeine. The pure caffeine powder currently sold online can be a real problem, because it is high concentration. Caffeine overdose can cause a heart attack, for instance. 
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Caffeine is a naturally-occurring bitter, white crystalline substance (a xanthine alkaloid) found in tea, coffee, and added to soft drinks like Mountain Dew. Caffeine is a stimulant drug, and a reversible acetylcholinesterase inhibitor. Caffeine raises heart rate and alertness, and can be used to stay awake.