PT - JOURNAL ARTICLE AU - FRED W. OBERST TI - A METHOD FOR THE DETERMINATION OF DEMEROL IN URINE AND RESULTS OF ITS APPLICATION DP - 1943 Sep 01 TA - Journal of Pharmacology and Experimental Therapeutics PG - 10--15 VI - 79 IP - 1 4099 - http://jpet.aspetjournals.org/content/79/1/10.short 4100 - http://jpet.aspetjournals.org/content/79/1/10.full SO - J Pharmacol Exp Ther1943 Sep 01; 79 AB - 1. A method for the determination of Demerol in urine is described. 2. The per cent of Demerol excreted in the urine of post-addicts not requiring an analgetic receiving 300 to 800 mgm. Demerol per day varied between 2.2 and 21.2. The average for 273 analyses was 9.1%. Tolerance was not a factor affecting Demerol excretion. 3. The average per cent excretion of Demerol after single doses of 100 mgm. was, after 24 hours, about the same as in patients receiving daily multiple doses varying from 300 to 800 mgm. About 72% of the total amount of detectable Demerol in urine is excreted within 7 hours after a dose.