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Renal concentrating defects were found in 8 out of 24 patients treated with demeclocycline for acne. By evaluation of maximum and minimum urine osmolalities, free-water clearance (CH2O), and solute-free water reabsorption (TCH2O), in three of five symptomatic patients the defect was determined to be nephrogenic, dose-dependent, and reversible. A dose-dependent, reversible defect in antidiuretic hormone (ADH)-induced water flow was also produced by demeclocycline in gravimetric studies with paired toad urinary hemibladders. This defect in ADH responsiveness was probably located at the serosal surface and was probably caused by impairment of both cyclic-AMP generation and action.
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Singer et al. (1973) studied this question.
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