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Abstract
A highly sensitive method for the determination of meperidine and normeperidine in biological fluids is presented. Concentrations as low as 5 ng meperidine and 25 ng normeperidine per ml of sample can be determined. The recovery of meperidine from control plasma and urine was 91.3 to 102.5% and the recovery of normeperidine was 64.7 to 82.8%. The method has been successfully used for the determination of meperidine in human plasma and urine and of normeperidine in human urine.