Pills are only a short term fix. As soon as you stop taking them you will increase weight again and probably more than what you have lost before because of the pills (-> Jo-Jo effect). Besides, the weight you are losing with the "help" of the pills is mainly water rather than fat! You wouldn't be the first one suffering from kidney damage afterwards.

Instead of taking pills you can: take for breakfast something like low calorie Muesli and for lunch take only fruits. For dinner you can eat whatever you like as long as it is not too much. Drink plenty of water, as water (unlike beer) will make you feel full (beer makes you hungry). Some exercise (2-3km jogging 3 times a week or a daily 3km walk) will speed up the weight losing process. With this recipe you should be able to loose at least 1 ~ 1.5kg per week in a very healthy way and not gain it back. losing lots of weight in a very short time due to pills is neither healthy nor will the result last for long.