In pediatric patients, which is the major conjugation pathway?

In pediatric patients, which is the major conjugation pathway?

• A. Glucuronidation
• B. Oxidation
• C. Sulfation
• D. Methylation

Answer: (C)

In pediatric patients, the major conjugation pathway is sulfation. This happens because the enzymes responsible for sulfation (sulfotransferases) mature early and are quite active even in newborns, while the enzymes for glucuronidation (UGTs) are still immature during early life and don’t reach adult-like activity until later. Conjugation adds a polar group to drugs to help excrete them, and in infants the sulfation route often handles most of this task, whereas in adults glucuronidation becomes the dominant pathway as UGT activity increases with age. Oxidation is a Phase I reaction, not a conjugation, and methylation is a less common Phase II route, so they aren’t the primary mechanisms driving drug clearance in young patients.

In pediatric patients, the major conjugation pathway is sulfation. This happens because the enzymes responsible for sulfation (sulfotransferases) mature early and are quite active even in newborns, while the enzymes for glucuronidation (UGTs) are still immature during early life and don’t reach adult-like activity until later. Conjugation adds a polar group to drugs to help excrete them, and in infants the sulfation route often handles most of this task, whereas in adults glucuronidation becomes the dominant pathway as UGT activity increases with age.

Oxidation is a Phase I reaction, not a conjugation, and methylation is a less common Phase II route, so they aren’t the primary mechanisms driving drug clearance in young patients.