My mother-in-law had an actual overdose from caffeine and because of that she now drinks tea but she had nine or 10 coffees Australian coffees not American coffees/dishwater. Australian drink stronger coffee. She now only drinks tea because the caffeine content is so low.

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Very little caffeine in tea half the amount so 2 teas equals one coffee , I think something else made you sick maybe the tea itself but I doubt the caffeine did it