RT Journal Article SR Electronic T1 An unusual case of piperacillin-tazobactam-induced fever, eosinophilia, thrombocytopenia and liver damage JF European Journal of Hospital Pharmacy JO Eur J Hosp Pharm FD British Medical Journal Publishing Group SP ejhpharm-2020-002575 DO 10.1136/ejhpharm-2020-002575 A1 Jiawen Lv A1 Guannan Wu A1 Fang Zhang A1 Xin Su YR 2021 UL http://ejhp.bmj.com/content/early/2021/02/07/ejhpharm-2020-002575.abstract AB Piperacillin-tazobactam is a broad-spectrum antimicrobial agent that is commonly used in clinical practice. The development of delayed drug hypersensitivity reaction (DHR) has been reported in several cases previously. Here we describe an unusual case of non-immediate DHR due to a prolonged course of piperacillin-tazobactam. We report a 22-year-old man who developed fever, eosinophilia, thrombocytopenia and elevated hepatic enzymes following 17 days of piperacillin-tazobactam for methicillin-sensitive Staphylococcus aureus (MSSA) pneumonia. These adverse reactions were reversed immediately after antibiotic cessation. Our case highlights that clinicians should be aware of delayed adverse effects in patients receiving long-term piperacillin-tazobactam treatment.