It can be used as part of treatment including phosphate binders or vitamin D sterols. • to reduce hypercalcaemia (high blood calcium levels) in patients with parathyroid carcinoma (cancer of the parathyroid glands), or in patients with primary hyperparathyroidism who cannot have their parathyroid glands removed or when the doctor thinks that removal of the parathyroid glands is not appropriate. ‘ Primary ’ means that the hyperparathyroidism is not caused by any other condition.