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The effect of intravenously administered ampicillin on plasma levels and renal clearance of enprofylline was investigated in seven young and six elderly volunteers. On one occasion, each subject received 2 g of ampicillin intravenously, and serum concentrations of ampicillin were followed for 4 hours. On a separate occasion, a loading infusion of enprofylline was administered over 60 min., aiming at a plasma level of 2 micrograms/ml, and followed by a maintenance infusion. During this an infusion of 2 g of ampicillin was given for 10 min., and subsequently, renal clearance and plasma levels of enprofylline were followed for 4 hours. Plasma enprofylline levels increased significantly in the subjects after ampicillin infusion, but the effects on renal clearance of enprofylline were not statistically significant. The magnitude of the effects on enprofylline plasma levels and renal clearance from high doses of ampicillin do not suggest that interaction with beta-lactam antibiotics will be a serious problem for patients on enprofylline treatment.
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