Cholecalciferol and ergocalciferol are used in the treatment of known or suspected vitamin D deficiency or the prevention of vitamin D deficiency when bodily needs are increased as seen in pregnancy. Calcitriol can also be used, especially when an immediate effect is desired as in severe deficiencies because it is the active form of vitamin D found in the body. This would involve treatment of rickets, osteomalacia, muscle pain, and hypocalcemia that can result from vitamin D deficiency. Vitamin D is also useful, particularly when used with calcium supplementation, to treat osteo-porosis.44,73 Vitamin D can also be used to treat hypophos-phatemia or hypocalcemia because of other causes, such as hypoparathyroidism.
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