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After each tablet there will be 400mg in your body, provided you take the tablets after an exact time period, which would be 12 hours because there are 24 in a day, and 24 divided by 2= 12. The actual taking of the tablet for the first time triggers the chain. Taking the medicine must come before the halving, then, but only by the smallest possible instant, because the effect happens twelve hours after you HAVE ALREADY TAKEN THE TABLET! You would have 400mg of medicine in you ,before the effect, have it doubled to 800, and at the exact same moment halved, so the amount of medicine in you after taking the tablet would be 400mg.It would never have actually reached 800mg.