rubefacient

例句：

1. 1.He took an antihistamine to help with his allergies.
   他服用了抗组胺药来缓解他的过敏症状。
2. 2.The doctor prescribed him some antihistamines for his cold symptoms.
   医生给他开了一些抗组胺药来治疗他的感冒症状。
3. 3.Antihistamines are commonly used to treat allergic reactions and itching.
   抗组胺药常用于治疗过敏反应和瘙痒。