Calcitriol
"I have also been on Calcitriol 0.5 mcg x 2 twice daily in addition to 5400 mg (total) calcium and 756 mg magnesium (total) daily.  Still experiencing sever symptoms of hypocalcemia - tingling, chills, muscle spasm, light headedness, etc.   Also, had papillary cancer with all thyroid removed - surgeon likely removed all parathyroids as 2 were found in pathology and no parathyroid hormone detected in subsequent lab tests."