This article reported a case of a 62-year old female patient of pneumonia whose emptysis appeared just three days after using mezlocillin,and afterwards mutiple oral bloody bullae were visible.

• 四川大学华西口腔医院黏膜科对1例药物性血小板减少性症(美洛西林钠相关性)患者给予糖皮质激素、成分输血治疗,使其病愈出院。