Lithium is widely used in the treatment of bipolar disorders. Long-term administration of lithium often leads to side effects concerning the subjects: nephrology, endocrinology and surgery. This review emphasizes nephrotoxicity.Lithium treatment may disturb responsiveness to antidiuretic hormone (ADH), causing a nephrogenic diabetes insipidus. Furthermore long-term lithium therapy may trigger hyperparathyreoidism with hypercalcemia and chronic interstitial nephritis with development of microcysts. Long-term patients have an increased risk to develop impaired renal function. Lithium-induced endstage renal disease is rare. Termination of lithium treatment may decrease the risk of progression.To ensure security of lithium treatment regular controls of urine osmolarity, lithium-, creatinine- , thyroid stimulating hormone- and calcium-levels are essential. Patients with decreased renal function should be referred to a specialist early.
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