Zilpaterol is a synthetic β₂ adrenergic agonist. Under its brand name, Zilmax, it is used to increase the size of cattle and the efficiency of feeding them. Zilmax is produced by Intervet, a subsidiary of Merck & Co., and marketed as a "beef-improvement t + some more technical info. As an active pharmaceutical ingredient it is typically supplied as the hydrochloride salt with high purity and well-defined crystalline properties; pharmacologically it acts on β2-adrenergic receptors to shift nutrient partitioning toward increased lean muscle deposition and reduced fat accretion. Key technical points for formulation and handling include stability in dry crystalline form under controlled humidity and temperature, solubility characteristics that favor salt forms for oral dosing matrices, and routine quality control by chromatographic and spectrometric methods to confirm identity, potency and purity.
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