Benzphetamine hydrochloride tablets, USP are indicated in the management of exogenous obesity as a short term adjunct in a regimen of weight reduction based on caloric restriction in patients with an initial body mass index of 30 kg/m2 or higher who have not responded to appropriate weight reducing regimen alone. Below is a chart of Body Mass Index based on various heights and weights. BMI is calculated by taking the patient's weight, in kilograms , divided by the patient's height, in meters , squared. Metric conversions are as follows: pounds.