CHOLECALCIFEROL belongs to the class of 'Vitamins', primarily used to treat low blood calcium levels. CHOLECALCIFEROL effectively treats various conditions in the body like Vitamin D deficiency, osteoporosis (weak and brittle bones), hypoparathyroidism (parathyroid glands make low levels of calcium in the body), latent tetany (a muscle disease with low blood calcium levels) and rickets or osteomalacia (softening or deforming of bones due to lack of calcium). Vitamin D deficiency occurs when your body has low Vitamin D levels and is caused by inadequate nutrition, intestinal malabsorption, or lack of sunlight exposure.