Arsenic Trioxide Injection (brand names: Trisenox, Arsenox) is an anti‑neoplastic (chemotherapy) agent used mainly in the treatment of:Acute Promyelocytic Leukemia (APL)Relapsed or refractory APLCertain types of blood cancers under specialist supervisionEach vial typically contains 10 mg of Arsenic Trioxide and is administered under strict medical supervision in a hospital setting