Phentermine 37.5 mg is a prescription appetite suppressant used as a short-term aid for weight loss in individuals with obesity. It belongs to a class of medications called anorectics, which stimulate the central nervous system to decrease appetite and increase energy expenditure Because of its chemical similarities to amphetamines, it is classified as a Schedule IV controlled substance. This means it carries a risk of dependence and is strictly regulated. It is designed to be used for a maximum of 12 weeks alongside a reduced-calorie diet, regular exercise, and behavioral modifications.