Ractopamine is a synthetic β-adrenergic agonist. The mode of action of ractopamine primarily involves the modulation of metabolic pathways and signals in muscle and lipid cells to enhance protein accretion, it promotes muscle mass development, limits fat deposition, and reduces feed consumption. Ractopamine can be used to treat muscular dystrophy, increase muscle, reduce fat accumulation, and benefit the growth of fetuses and newborns. But, ractopamine is being used by some illegal businesses. Ractopamine also include regulation of hormone release and modification of blood flow. The residues of ractopamine can be detected in plasma, urine, tissues, etc.