TY - JOUR T1 - EXacerbation of renal failure with doxycycline use AU - Whelton A Y1 - 1979/05/01 N1 - 10.1001/archinte.1979.03630420089033 JO - Archives of Internal Medicine SP - 603 EP - 604 VL - 139 IS - 5 N2 - To the Editor.—  The temporally related exacerbation of renal failure associated with doxycycline use, as reported by Dr Orr and colleagues in the Archives (138:793-794, 1978), is certainly of interest and importance. However, the report serves to emphasize the caution with which one should interpret such clinical findings in the absence of pertinent serum drug concentration data and the intercurrent use of other potent compounds that influence renal function.The case report indicates that, after doxycycline therapy, the patient in question received a potent diuretic twice daily at a time when she exhibited peripheral edema. She subsequently manifested evidence of fluid depletion and mild postural hypotension. The contribution of doxycycline to the pathogenesis of the patient's fluid depletion must remain speculative at best. It is perhaps worth noting that it is almost invariably the demethylchlortetracycline form of tetracycline that produces direct renal tubular concentration effects.1-3 The role of the SN - 0003-9926 M3 - doi: 10.1001/archinte.1979.03630420089033 UR - http://dx.doi.org/10.1001/archinte.1979.03630420089033 ER -