hippo, orlistat/xenical is a drug that stops fat from being absorbed in the gut. WITH dieting it helps people lose weight, but it also increases flatulance (farting), makes your poos "mucosy" and may result in some incontinence. But it is a very successful weight loss drug (for it to be effective, you have to be on a diet as well though).
Otherwise, some antidepressants are appetite suppressors. Cymbalta is the first one that comes to mind (its an SNRI). This may be a good way of killing two birds with one stone if you know what I mean. The only two anti-depressants I know that increase appetite are mirtazapine and olanzapine, so if you are unlucky enough to take one of these two, maybe speak to your doc about changing.
Delta: Our paths wind as does our direction. Light shines upon us - we hit pockets of bleak darkness. we come out with new eyes, yet still undefined in terms of whole meaning. How exciting it is to live, love, learn and grow.