um, actually, i think that many mg's is equal to more like 2 cups of coffee. if not more. so actually 4 or 5 of these would be more equal to 8 - 10 or possibly more cups of coffee. and just think....... if you take all of those pills at once, all of those cups are going to hit you AT ONCE. this will leave you with no positive effects and all of the side effects (i.e.: naseau, jitteryness, dry mouth etc.) if you need to stay up for an X amount of time, space out the caffeine pills more.
the other alternative would be a more pleasurable "upper" like adderall, meth, ritalin, dexedrine...