[Lithium induced dysfunction of the parathyroid hormone].

The prevalence of hyperparathyroidism (HPT) in patients treated with lithium is higher than that in controls. Lithium seems to affect calcium metabolism, by acting directly parathyroid hormone cells, and distal tubuli in the kidneys. Because hypercalcaemic HPT can cause psychiatric symptoms mistakenly attributed to the lithium treatment, ionised calcium should be a standard control.