patients with clinical siadh but low serum adh levels can harbor a malignant or benign process that , notwithstanding the low adh levels , may still remain responsive to demeclocycline , suggesting either neoplastic production of a biologically-active , immunologically-inactive adh-like peptide , or increased renal tubular sensitivity to adh .
C0021141
siadh
C0011276
demeclocycline