MedChemExpress Cladribine (2-Chloro-2′-deoxyadenosine), a purine nucleoside analog, is an orally active adenosine deaminase inhibitor. Cladribine functions as an inhibitor of DNA synthesis to block the repair of the damaged DNA. Cladribine can inhibit DNA methylation. Cladribine has anti-lymphoma activity. Cladribine can be used for the research of several hematologic malignancies and multiple sclerosis.