Disclosed are methods for enhancing the efficacy of monoclonal antibody therapy, which entails co-administering a therapeutic monoclonal antibody, or a functional fragment thereof, and an effective amount of colchicine or hydroxychloroquine, or a combination thereof, to a patient in need thereof. Also disclosed are methods of prolonging or increasing the time a monoclonal antibody remains in the circulation of a patient, which entails co-administering a therapeutic monoclonal antibody, or a functional fragment of the monoclonal antibody, and an effective amount of colchicine or hydroxychloroquine, or a combination thereof, to a patient in need thereof, wherein the time the monoclonal antibody remains in the circulation (e.g., blood serum) of the patient is increased relative to the same regimen of administration of the monoclonal antibody but without the co-administration of the effective amount of colchicine and/or hydroxychloroquine. Further disclosed are therapeutic combinations, and kits containing the monoclonal antibodies and hydroxychloroquine and/or colchicine.
