If you are wondering how much you should use then here is the most common usage recommendation. You can take 3 capsules on a regular basis for 2 months straight. Then you have to take a 17 day or a one and a half week break. It will give you better results if you use it 15 minutes before you go to workout.
Do not take too many pills, it is not safe to take so many no matter how tough you are. If you insist on taking more pills then you better ask a doctor before giving it a try.