Zosyn-Induced Rapid Thrombocytopenia in a Patient With End-Stage Renal Disease and HIV: A Case Report.

Thrombocytopenia is a rare but potentially serious complication associated with the use of various medications, including antibiotics. Piperacillin-tazobactam (Zosyn), a commonly used broad-spectrum antibiotic, has been reported as an infrequent cause of drug-induced thrombocytopenia. We present a case of a 65-year-old female with end-stage renal disease (ESRD) on hemodialysis, HIV, and multiple comorbidities who developed rapid-onset thrombocytopenia shortly after receiving Zosyn. The patient's platelet count dropped from a baseline of 291,000/μL on admission to a nadir of 8,000/μL within 36 hours of starting Zosyn. The administration of Zosyn was promptly discontinued, and the patient's platelet count gradually increased to 134,000/μL within two days after discontinuation. The patient had no apparent bleeding manifestations during her hospital stay. Further workup for other causes of thrombocytopenia, including heparin-induced thrombocytopenia (HIT), was negative. This case highlights the importance of vigilance for drug-induced thrombocytopenia in patients receiving Zosyn and the need for prompt recognition and management to prevent potential complications.