Calcium
Anorexia, Constipation, Flatulence, Nausea, Vomiting, Hypercalcemia, Hypophosphatemia, Xerostomia, Acid rebound, Milk-alkali syndrome, Coma, Confusion, Delirium, Headache, Lethargy.
Calcitrol:
Abdominal pain,Apathy,BUN and creatinine increased,Cardiac arrhythmia,Constipation,Dry mouth,Dehydration,Growth suppression,Headache,Hyperthermia,Hypercalcemia,Hypercholesteremia,Hypermagnesemia,Hyperphosphatemia,Hypertension,Libido decreased,Metallic taste,Muscle or bone pain,Nocturia,Pruritus,Psychosis,Somnolence,Weakness