To address the clinical need for improving early response rates, maintaining sustained responses, reducing relapse rates, and minimizing adverse events in the treatment of immune thrombocytopenia (ITP), the investigators developed a comprehensive in-hospital and post-discharge management strategy. In this study, hospitalized participants will receive a 14-day regimen of high-dose dexamethasone (HD-DXM) plus recombinant human thrombopoietin (rhTPO), followed by a 10-week course of oral eltrombopag olamine dry suspension after discharge. The investigators aim to evaluate the efficacy and safety of this sequential treatment strategy in adult ITP patients.