Boxed warning (cytopenias, infusion-related reactions, and infections warning: cytopenias, infusion-related reactions, and infections): Serious, including fatal, cytopenias, infusion-related reactions, and infections can occur (5.1–5.3). Limit doses to 30 mg (single) and 90 mg (cumulative weekly), higher doses increase risk of pancytopenia. Escalate dose gradually and monitor patients during infusion. Cytopenias: Obtain complete blood counts (CBC) and platelet counts at weekly intervals during therapy and CD4 counts after therapy until recovery to ≥200 cells/µL. Withhold for severe cytopenias. Discontinue for autoimmune or severe hematologic adverse reactions. Immunosuppression/Infections: CAMPATH induces severe and prolonged lymphopenia and increases risk of infection. If a serious infection occurs, withhold treatment until infection resolves.