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Hypervitaminosis D
Definition Hypervitaminosis D is a condition that occurs after taking excessive doses of vitamin D. Alternative Names Vitamin D toxicity Causes, incidence, and risk factors An excess of vitamin D causes abnormally high levels of calcium in the blood, which can eventually severely damage the bones, soft tissues, and kidneys. It is almost always caused by forms of vitamin D that require a doctor's prescription. Symptoms - Constipation
- Decreased appetite (anorexia)
- Dehydration
- Fatigue
- Irritability
- Vomiting
Signs and tests - Hypercalcemia (excess calcium in the blood)
- Hypercalciuria (excess calcium in the urine)
- Hypertension (high blood pressure)
- Polydipsia (excessive thirst)
- Polyuria (passing large amounts of urine)
Tests to confirm the diagnosis: - 1,25 dihydroxyVitamin D levels
- 25-hydroxyVitamin D levels
- Serum calcium
- Serum phosphorus
- X-ray of the bone
Treatment Stop taking vitamin D. Consult your physician. In severe cases, other treatment may be necessary. Expectations (prognosis) Recovery is expected. Complications - Dehydration
- Hypercalcemia
- Kidney damage
- Kidney stones
Calling your health care provider Call your health care provider if you or your child shows symptoms of hypervitaminosis D, and you have been taking vitamin D in excess of the recommended daily allowance. Also call if you or your child show symptoms and you have been taking a prescription form of vitamin D. Prevention To prevent this condition, pay careful attention to the correct vitamin D dose. Review date: 12/6/2007 Reviewed By: Nancy J. Rennert, M.D., Chief of Endocrinology Diabetes, Norwalk Hospital, Associate Clinical Professor of Medicine, Yale University School of Medicine, New Haven, CT. Review provided by VeriMed Healthcare Network.
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