How does lactulose reduce ammonia levels?

How does lactulose reduce ammonia levels?

• A. It lowers ammonia production in liver
• B. It traps ammonia in the gut and promotes excretion
• C. It reduces intestinal absorption of potassium
• D. It acts as an anti-inflammatory

Answer: (B)

Lactulose works by changing the gut environment to get rid of ammonia rather than altering liver production or having anti-inflammatory effects. It’s a nonabsorbable sugar that colonic bacteria ferment into acids, lowering the pH in the colon. This acidic environment converts ammonia (NH3) to ammonium (NH4+), which cannot be readily absorbed, so it stays in the gut and is eliminated in the stool. The laxative effect of lactulose also speeds intestinal transit, further reducing ammonia absorption. So the best description is that lactulose traps ammonia in the gut and promotes its excretion.

Lactulose works by changing the gut environment to get rid of ammonia rather than altering liver production or having anti-inflammatory effects. It’s a nonabsorbable sugar that colonic bacteria ferment into acids, lowering the pH in the colon. This acidic environment converts ammonia (NH3) to ammonium (NH4+), which cannot be readily absorbed, so it stays in the gut and is eliminated in the stool. The laxative effect of lactulose also speeds intestinal transit, further reducing ammonia absorption. So the best description is that lactulose traps ammonia in the gut and promotes its excretion.