Decitabine is a medication primarily used in the treatment of certain types of blood cancers, such as myelodysplastic syndromes and acute myeloid leukemia. It belongs to a class of drugs known as hypomethylating agents, which work by modifying the DNA in cancer cells to help restore normal cell function and promote cell death. Administered through injection, Decitabine is typically given in cycles, allowing the body time to recover between treatments. Its effectiveness can vary among patients, and it may cause side effects, including low blood cell counts, fatigue, and increased risk of infections. Regular monitoring by healthcare professionals is essential during treatment.