An agent of choice in acute hypercalcemia due to malignancy is
Calcitonin is the fastest acting followed by I.V bisphosphonates. hyperccalcimia in malignancy is mainly seen in tumors secreting Parathyroid hormone related peptide PTHrP. Ref: CMDT pg 801 2010 ed.
Calcitonin
Cholecalciferol
Teriperatide
Zolendronate
Endocrinology