recent reports that cimetidine , a blocker of histamine h2 receptors , lowered serum calcium and/or immunoreactive parathyroid hormone ( pth ) concentrations in primary or secondary hyperparathyroidism prompted us to administer the drug ( 300 mg , orally , every 6 h ) to two patients with hyperparathyroidism accompanying familial multiple endocrine neoplasia type 1 .
C0020503
secondary hyperparathyroidism
C0020502
hyperparathyroidism