The phenetermine will make you jittery, cause sleeplessness etc., especially during the 1st 2 weeks of use. I think the
energy drinks are not so good, either, and the
diet red bull just tastes awful. You shouldn't need it with the phen. If you are taking phen and a water pill, you will need to replace your electrolytes with potassium. If you do not get potassium or forget to take it, it can make you tired.
Good luck.
V.