I've been using Lexatrim for almost 2 months and have lost 16 pounds. They definitely make my heart beat fast, so I recommend taking 2 pills per day (1 in morning and 1 at night) to start off with. I have tried other diet pills in the past and have never gotten the results I have experienced with Lexatrim. I take 6 caps per day - 2 in morning, 2 in afternoon and 2 at about 5:00 PM (usually I go to sleep at 10:00, and I don't have any trouble sleeping). I once took lexatrim about an hour before bed and could not sleep, so I don't recommend doing that. A definite thumbs up for this product as it's given me hope that there is finally something out there worth the money.