Excessive use of laxatives will cause you to lose essential vitamins that are normally absorbed through the bowels. Also, it can result in dehydration and low potassium levels, which can result in kidney failure. And you don't actually lose weight, all that happens is that you get dehydrated and as soon as you replace that water you're back to where you started. Overall, a really dumb idea.
the only thing I know about laxatives is that it makes you produce a lot of "gold" and this "gold" is not the good kind.You know, the "gold" that you'll rather flush down the toilet, the type of "gold" that comes out of your rear.
You should really read all of the information regarding your question that is connected to this link. What you are proposing to do and what a few people are trying to help you do is not a good idea for a lot of good reasons. Please read more about it. http://www.eating-disorder.org/laxatives.html