as you know with xenical, you have to really modify your diet to avoid the nasty side effects. and that it works by removing the fat from what you eat & the body gets rid of through bowel movements. so when you stop taking it you'll have to stay on a strict, very low fat diet because you won't have anything isolating & removing those fats from your body. that alone can cause some weight gain. do you exercise? if not, you have to start & not stop because you'll regain weight. you might try "weening" yourself off slowly, for instance taking 1 every other day for a couple of weeks, then every 2 days for a couple of weeks, so forth & so on so that you'll slowly stop taking them. i don't recommend just stopping all at once.