A white,odorless,powdered or crystalline alkaloid,C10H15NO,isolated from shrubs of the genus Ephedra or made synthetically.It is used in the treatment of allergies and asthma.

• 麻黄素一种白色，无味，粉状或结晶状碱，C10H15NO，从麻黄属植物中提取或人工合成。用于治疗过敏和哮喘