Which medication is commonly given to treat hepatic encephalopathy by reducing ammonia levels?

Which medication is commonly given to treat hepatic encephalopathy by reducing ammonia levels?

• A. Lactulose
• B. Rifaximin
• C. Neomycin
• D. Metronidazole

Answer: (D)

Reducing ammonia production and absorption in the gut is the primary way to treat hepatic encephalopathy. Lactulose is a nonabsorbable sugar that, once in the colon, is metabolized by bacteria into short-chain acids, which lower the colonic pH. This acidic environment converts ammonia (NH3) to ammonium (NH4+), a form that is not readily absorbed into the bloodstream and will be excreted in stool. The laxative effect of lactulose also speeds bowel transit, further reducing the time available for ammonia production and absorption. This combination leads to lower blood ammonia levels and improvement in mental status. Rifaximin can be added to further decrease ammonia-producing gut bacteria, and older antibiotics like neomycin or metronidazole have fallen out of favor due to side effects. So, lactulose is commonly used to reduce ammonia levels in hepatic encephalopathy.

Reducing ammonia production and absorption in the gut is the primary way to treat hepatic encephalopathy. Lactulose is a nonabsorbable sugar that, once in the colon, is metabolized by bacteria into short-chain acids, which lower the colonic pH. This acidic environment converts ammonia (NH3) to ammonium (NH4+), a form that is not readily absorbed into the bloodstream and will be excreted in stool. The laxative effect of lactulose also speeds bowel transit, further reducing the time available for ammonia production and absorption. This combination leads to lower blood ammonia levels and improvement in mental status. Rifaximin can be added to further decrease ammonia-producing gut bacteria, and older antibiotics like neomycin or metronidazole have fallen out of favor due to side effects. So, lactulose is commonly used to reduce ammonia levels in hepatic encephalopathy.