Keto Tone: diet pills do work well sometimes and rapidly too, just as you want them to. But there can be no guarantee that you'll not regain the lost weight once you stop taking the pills. In fact there is a possibility of gaining twice the weight you lost. You'll also realize that the damage has been done to your heart and the entire system in general. o It is very dangerous to use pills containing ephedra according to the Food and Drug Administration, U. S. A., as it contains some unpleasant side-effects.