You really need to read the book, there are even a couple of free on-line copies you can download. To answer your question, go ahead and take the laxative tea tonight. But, PLEASE read the book, it will make a huge difference in your knowledge and understanding of the Master Cleanse. There is a lot of false and/or incomplete information in the popular media about the Master Cleanse. You can learn a lot by reading the FAQs in this forum, in fact, I beg you to do at least that much tonight. Educate yourself and good luck in your endeavor.