in an attempt to examine norepinepherine metabolism in the human subject , tritium-labeled d , l-norepinephrine was administered to 11 normal adults and the definitive turnover rates and relative specific activities of norepinephrine and its major catabolites , vanillylmandelic acid , 3-methoxy-4-hydroxyphenylethyleneglycol , and normetanephrine , as well as the cumulative 24 hr isotope excretion were determined .
C0025519
metabolism
C0221102
excretion