I've actually been looking into this, however I decided it would be better just to start off doing something then sitting here researching and researching all day. But I'm no bodybuilder(obviously) or anything this is just from what I learned in a couple days.
To clarify first off, there are no pills(anywhere) that will make you loose weight(fat) without diet and exercising. Also most of the pills have not been clinically studied nor approved by the FDA, so everything stated is not always fact and long term effects are not known.
There are different kinds of weight pills but I've been looking into endothermics. Most contain generally the samething. Caffeine, synephrine(ephedrine is no longer used) or other stimulant(geranium?), yohimbine, and other misc supplements to aid you. They work by heating up your body and increasing metabolic function. You can loose lots of water weight so don't be deceived, but you wanna loose fat.
I'm actually on my second day of lipo 6, which I have failed at horribly (haven't exercised). There are still some problems though, so this might help you make a decision. First staying hydrated is very important while on endothermics. I mean lots of water. It's not difficult to stay hydrated but the problem occurs that you will pee often. If you have work, school, or both which you probably do this will present a problem as pissing every 15 minutes will affect class/work time. And the only other thing I have found so far is that they suppress appetite. It appears to me that one of the most important things mentioned in losing weight is a fast metabolism. You can get this only by eating healthy, portionally, and often. So skipping meals isn't helping in long term weight loss or general health.
I don't wanna make this a super long post, so to sum it up you are gonna have to diet(maybe not diet but make healthy choices or cut back) and exercise with or without the pills. So if you don't feel comfortable with the side effects or long term effects then stick to the old fashion way. It will always work. However with the pills you might be able to decrease your body fat even quicker than normally.