Azacitidine is a medication primarily used to treat certain types of blood cancers, including myelodysplastic syndromes and acute myeloid leukemia. It works by inhibiting DNA methylation, which can help restore normal cell function and promote the production of healthy blood cells. Administered via injection, Azacitidine is often given in cycles, allowing the body time to recover between treatments. Common side effects may include nausea, fatigue, and low blood cell counts, which can increase the risk of infections or bleeding. Regular monitoring by healthcare professionals is essential during treatment.