vasoconstrictor

例句：

1. 1.The medication is a vasoconstrictor that helps to reduce blood pressure.
   这种药物是一种血管收缩剂，有助于降低血压。
2. 2. Vasoconstrictors are used in surgeries to control bleeding.
   血管收缩剂在手术中用于控制出血。
3. 3.The doctor prescribed a vasoconstrictor to help the patient recover from an injury.
   医生开了一种血管收缩剂，帮助患者从受伤中恢复。