RT Journal Article SR Electronic T1 BIOTRANSFORMATION PRODUCTS OF MEPERIDINE EXCRETED IN THE URINE OF MAN JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics SP 414 OP 419 VO 117 IS 4 A1 N. P. Plotnikoff A1 E. Leong Way A1 H. W. Elliott YR 1956 UL http://jpet.aspetjournals.org/content/117/4/414.abstract AB Employing the Brodie methyl orange and the Craig countercurrent techniques it was shown that meperidine is hydrolyzed and excreted in the urine of man as meperidinic acid and its corresponding acid conjugate. In addition, meperidine is demethylated to normeperidine which is then hydrolyzed to normeperidinic acid and partially conjugated.