P&B cleansing symptoms

I have just bought p&b to make the shakes and want to start asap but I have a few questions in regards to how it makes you feel? Im wondering if I should wait for the weekend to start or what? Does it make you poop alot? or like you have just had alot of fiber?does it make you feel tired or drained or anything. I work 12 hour days . Ive read alot of comments but no one really says anything about that part of it they mostly just talk about the plaque that comes out.. thanks!