An adrenergic drug,C9H13NO2,that is a powerful vasoconstrictor and is used to relieve nasal congestion,dilate the pupils,and maintain blood pressure during anesthesia.

• 苯肾上腺素一种肾上腺素的药剂，C9H13NO2，它是一种很强的血管收缩剂，可用于麻醉过程中减轻鼻充血、扩大瞳孔和稳定血压。