Hydronix 500 mg Capsule is a cytotoxic chemotherapy medication containing Hydroxyurea, primarily used in the treatment of various hematological and oncological conditions. It is indicated for resistant chronic myeloid leukemia (CML), locally advanced squamous cell carcinomas of the head and neck (excluding the lip) in combination with chemoradiation, essential thrombocythemia (ET), polycythemia vera (PV), sickle cell anemia, hypereosinophilic syndromes, melanomas, meningiomas, and inoperable ovarian cancer