If you only need to lose about 6-9 lbs. then sure, but any more and I'd say the same thing I said to the person who asked if they could lose weight in two weeks.
If you would like to see my response to that question, it is here: Lose Weight in Two Weeks
If you're really interested in losing weight as fast as possible while keeping it off, I explain why and how my weight loss program works in my new weight loss and diet program.