Study on the Efficacy and Safety of Tedizolid in Japanese Patients.

Background/Objective: Tedizolid (TZD), an oxazolidinone, causes fewer adverse events than linezolid (LZD). However, studies on the long-term efficacy and safety of TZD, particularly in patients with hematological malignancies (HMs), remain limited. This study aimed to evaluate the safety of long-term TZD use in Japanese patients, including those with HM. Methods: We retrospectively reviewed the medical records of patients aged 15 years and older who received TZD treatment at St. Luke's International Hospital between 2018 and 2023. Patient demographics, treatment duration, adverse events, and clinical outcomes were analyzed. Results: Data from 35 patients and 40 treatment episodes were analyzed, including 13 episodes in patients with HM, of whom 65.0% were male, with a median age of 69.0 years (IQR: 24.5 years). The median treatment duration was 13.5 days (IQR: 46.8), with a maximum of 203 days. TZD was switched from other anti-MRSA agents in 82.5% of cases, including 42.5% from LZD. One patient discontinued TZD due to liver dysfunction, attributed to concomitant medication use. Clinical cure rates were significantly higher in the non-HM group compared to the HM group (88.9% vs. 38.5%). The 90-day mortality rate differed notably between the HM and non-HM groups (69.2% and 3.7%). Despite 100% microbiological eradication, infection-related mortality rates were 3.7% in the non-HM and 38.5% in the HM group. No reported cases of optic neuritis, Clostridioides difficile colitis, or major bleeding; Conclusions: TZD appears to be safe for long-term use, regardless of HM status, with no major complications observed in this cohort.