氨苄青霉素为广谱半合成青霉素，主要用于治疗G-杆菌感染，临床上颇为常用，其不良反应皮疹较多见，发生率可高达10～20％，但停药数天后才出现皮疹较少见，我院在治疗过程中发现3例患者．用药5～7d，停药2～3d后出现皮疹，现介绍如下．例1，患者女，50岁，因咳嗽．畏冷发烧3d Ampicillin is a broad-spectrum semi-synthetic penicillin, mainly for the treatment of G-bacilli infection, clinically quite common, the more common adverse reactions rash, the incidence can be as high as 10 to 20%, but after a few days off drug rash than Rare, our hospital found 3 patients in the course of treatment. Medication 5 ~ 7d, 2 ~ 3d after stopping the rash, are presented below. Example 1, female patient, 50 years old, due to cough. Cold fever 3d