Rocaltrol is a prescription medication available in capsule form, each containing 0.25 micrograms (mcg) of calcitriol as the active ingredient. Calcitriol is a form of vitamin D that helps regulate calcium levels in the body. Rocaltrol is primarily used to treat hypocalcemia (low calcium levels) associated with chronic kidney disease and various parathyroid disorders. This medication is marketed under several brand names, including Laretol, Doxirol, Calcilol, and Active-D, by various pharmaceutical manufacturers globally.