640mg of caffeine isn't really that much. Hell, I would drink at least 800mg within 2-3 hours plus take stimulants. 8oz of coffee is a minimum 120mg (depends on the type of coffee). 8oz is a sip of coffee. My mug alone is 24oz and I'd have about 4 of those. Now I drink decaf and only have caffeine on occasion.
Makes me wonder what in the redbull really did it because I can't see how the caffeine would do it unless he had pre-existing heart problems.
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I was surprised at only the amount. I have consumed around 3 times as much when drinking with alcohol. The day following however my body feels really drained and joints and bones are sore. For that reason I don't drink large amounts of them drinks anymore.
I drank 3 red bulls once in 24 hours and was border line throwing up... I don't see how 8 is possible!
I once did 4 in 10 minutes. Spent the rest of the day with an incredibly sore gut. Not good. In my defence I was 15 at the time, and could'nt get ant recreational substances or alcohol at that point......