Caffeine tablets

Hi. I'm a swimmer, and before races I like to take caffeine. (it conforms to anti-doping rules, and its accepted, studies have shown that it improves performance for what i do). I never drink coffee or anything, or even coke, the only caffeine I think I ever get is when I take caffeine before races, which is ~2x a month. Anyway, each pill is 200 mg, and the box usually says "take one pill no more than every 3-4 hours". However, i've seen studies that show that the best amount to take is around 5mg/kg body weight, which for me is around 350 mg. So i take 1.75 of the tablets before my race. Does anyone know if there are ANY negative effects of taking more than the recommended one tablet? It doesnt' seem like there are any negative side effects for the caffeine, but then I'm wondering why it suggests you only use one tablet every 3-4 hours. Thanks

[live4fitness]

I don't know why all the different reviews on amounts. I would be very careful taking something like this. It speeds up your heart and with the physical activity of swimming you are also speeding up your heart.