“…It has been claimed that while tetracyclines in general (Shils, 1963) and outdated tetracyclines in particular (Gross, 1963) can be nephrotoxic the renal effects of demeclocycline are confined to an impairment of concentrating ability (Wilson et al, 1973). Castell and Sparks (1965) were the first to describe this peculiar property of demeclocycline, and their initial observations have since been confirmed (Singer and Rotenberg, 1973;Wilson et al, 1973;Maxon and Rutsky, 1973; Hayek and Ramirez, Miller and Palo, 1974). The mode of action of demeclocycline in producing nephrogenic diabetes insipidus is complex as both ADH- (Singer and Rotenberg, 1973;Feldman and Singer, 1974) and cyclic AMP- (Singer and Rotenberg, 1973;Dousa and Wilson, 1974) mediated effects on water transport can be separately affected.…”