contraindication

名词 contraindication:

1. (medicine) a reason that makes it inadvisable to prescribe a particular drug or employ a particular procedure or treatment

con.tra.in.di.ca.tion

n.（名词）
A factor that renders the administration of a drug or the carrying out of a medical procedure inadvisable:
禁忌症：使某种药物的服用或某种医疗过程的操作成为不可取的因素：
例句：
A previous allergic reaction to penicillin is a contraindication to the future use of that drug.
以前对青霉素的过敏反应是将来使用该药物的一种禁忌征象