If you are overweight but not obese, and you are prescribed treatment to lose weight, this treatment may be used off-label. This means that the drug is prescribed for a purpose for which it was not originally approved by the drug authorities.
"Off-label" use refers to prescribing a drug for an indication other than that for which it was approved by the relevant authority. While it can still be safe, it is crucial that you are fully informed about the off-label use of the prescribed medicine and that you consent to it.