Phentermine Hydrochloride (HCL) is a prescription medication used for weight control. It is in the sympathomimetic family of appetite suppressants used for the short term management of obesity. Phentermine is similar chemically to amphetamines.
Phentramin-d is a non-prescription formula used for weight control. The primary ingredient in Phentramin-d is also a sympathomimetic amine. However, Phentramin-d does not have the same chemical similarity to amphetamines, therefore, while it is considered safer.