Caffeine amount for pre wokout

Thanks for the advice everyone, its much appreciated.
I got the caffeine pills from Amazon. They contain 200mg caff each and on the special occasion I swallowed 4 all at once, so I'm sure I had 800mg. Maybe I was very lucky not to require medical attention, especially considering I did the ALS ice bucket challenge when about 400mg was in my system (presuming the half life is about 5 hours).

Anyway, I won't be taking this much again since clearly it is a bad idea, even on rare occasions. I'll stick to 1 or even half a pill.
 
It's all about your blood pressure. If you're hypertensive its not a good thing. BUT Caffeine is pretty irresistible ...drinking some right now. So if you get dizzy or hyperventilate STOP the work out.
 
Oh and I just remembered back when I got my personal trainer certification my instructor LOVED caffeine but he took a handful of raw almonds and chewed them up really well before he drank coffee to buffer the caffeine absorption.
 
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