Hey @bananabowl-,
Usually, doctors prescribe Duromine if your BMI is 30 or greater. Duromine-friendly doctors may prescribe even if your BMI is 27. But again, it depends on your health conditions. If you are not overweight but your doctor insists on losing weight because of some potential or actual diseases, he may also prescribe it.
Did you ask your doctor for a prescription? Why do you want to lose weight, dear?