Which is NOT listed as a route of drug elimination?

Which is NOT listed as a route of drug elimination?

• A. Feces
• B. Urine
• C. Expired Air
• D. Bile Excretion

Answer: (D)

Elimination routes describe how a drug leaves the body. The main pathways are through the kidneys (urine), through the GI tract (feces), and via the lungs (expired air) for volatile compounds. Biliary excretion is a mechanism by which drugs are secreted into bile and then enter the intestine, where they are ultimately eliminated in feces. In many standard lists, biliary excretion isn’t counted as a separate route of elimination; it’s viewed as a pathway that ends up as fecal elimination. So in that framing, biliary excretion isn’t listed as its own distinct route, even though it contributes to fecal excretion.

Elimination routes describe how a drug leaves the body. The main pathways are through the kidneys (urine), through the GI tract (feces), and via the lungs (expired air) for volatile compounds. Biliary excretion is a mechanism by which drugs are secreted into bile and then enter the intestine, where they are ultimately eliminated in feces. In many standard lists, biliary excretion isn’t counted as a separate route of elimination; it’s viewed as a pathway that ends up as fecal elimination. So in that framing, biliary excretion isn’t listed as its own distinct route, even though it contributes to fecal excretion.