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Pregnancy: Category A - Safety of vitamin D in amounts more than 400 IU/day is not established. Avoid doses greater than the RDA during a normal pregnancy. Animal studies have shown fetal abnormalities associated with hypervitaminosis D.
Lactation: Vitamin D is excreted in breast milk in limited amounts. In a mother given large doses of Vitamin D, 25-hydroxycholecalciferol appeared in the milk and caused hypercalcemia in the child. Monitoring of infant's serum calcium concentration was required. Do not nurse while taking calcitriol; otherwise, exercise caution when administering to nursing mother.
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