Lorcaserin is a synthetic chemical compound (C₁₁H₁₄ClN) and selective agonist of the 5-HT2C serotonin receptor, primarily used as an active pharmaceutical ingredient in appetite suppressant medications to aid weight management in obese or overweight adults, particularly those with comorbidities such as hypertension, type 2 diabetes, or dyslipidemia. It acts by stimulating serotonin receptors in the brain to decrease appetite and enhance satiety, supporting adherence to reduced-calorie diets and promoting sustained weight loss. It is typically integrated into comprehensive programs involving dietary modifications, physical activity, and behavioral counseling, showing efficacy in individuals prone to binge or emotional eating. As a specialty chemical reagent, it is available in high purity for pharmaceutical research, synthesis, or formulation. Clinical use requires medical supervision due to potential adverse effects, including psychiatric symptoms or serotonin syndrome risks.