Slimming tablets are a waste of time and money.
The only REAL way to lose weight is to have a good diet, and do regular exercise.
Note I said HAVE a good diet, not GO ON a diet. Give yourself a diet you can stay on for the rest of your life.
Look carefully at WHAT you eat, and HOW MUCH of it.
Certain things are VERY bad for you: creamy sauces, biscuits, cakes, sweets, pork pie and other pies, curries, mayonaisse, fried food, chips, crisps, anything high fat, anything high in sugar and so on.
Eat NONE of these.
Certain things fill you up and are fairly good to eat - pasta and potatoes for example.
Dont worry too much about counting calories, just try to eat GOOD things (fruit, vegatables etc), and avoid BAD things (see list above).
Keep yourself busy and you will think less of food, dont "snack", or if you do eat carrott or fruit.
Dont keep telling people you are ON A DIET, or you will talk about food and that will make you hungry, just quietly get on with it.
As someone said, losing weight is not a quick thing, just a couple of pounds a week is about normal, any quicker and you can make yourself ill.
If you start to eat well (and a little less than you need), and do regular exercise (walking, swiming and cycling are the best) then the weight will gradually come off.
Good luck.