as someone heading into the Nutrition field (justwaiting to hear bck from Uni on admission - fingers crossed) and a Type 2 diabetic.... these drugs should absolutely NOT be used specifically for weight loss except in cases where a person's BMI is to the point where either this or surgery are the only options left.
Explanation - the function not only as appetite suppressants, but also activate a hormone that stimulates the release of insulin into the bloodstream, while at the same time, telling the liver to slow down gluconeogenesis. In theory, this would be a good thing short term and probably is, but long term ... appetite suppression is not the way you want to lose weight ideally because you end up chronically deficient in calories, and by extension can end up deficient in vitamins, minerals and other things. While many obese people definiely do need to reduce calories, that should be a short term goal. Also, flooding your body with insulin on a regular basis if you're overweight but not yet insulin resistant or have type 2 diabetes... you're running a high risk of hypoglycemia, which is never good.
I could go into more detail here, but suffice to say that the better way to lose weight is to increase your output, not decrease your input. Taking shortcuts is going to cause more problems