Arzerra (generic: ofatumumab) is a prescription medication used to treat patients with chronic lymphocytic leukemia (CLL). Arzerra belongs to a group of drugs called monoclonal antibodies, which work by killing cancer cells.

This medication is available in an injectable form to be given directly into a vein (IV) by a healthcare professional.

Common side effects of Arzerra include cough, diarrhea, fatigue, and rash.