MTTC Health Education (112) Practice Test

Which statement about acetaminophen safety is true?

It is safe in any amount regardless of alcohol.

The risk of liver damage increases with concurrent alcohol use.

Concurrent alcohol use increases the risk of liver injury from acetaminophen. Here’s why: acetaminophen is mostly safe at recommended doses, but a portion is processed in the liver into a toxic metabolite called NAPQI. Normally, glutathione neutralizes NAPQI, preventing damage. Alcohol changes this balance by inducing liver enzymes (like CYP2E1) that convert more acetaminophen into NAPQI, and chronic alcohol use can deplete glutathione stores. With more NAPQI produced and less detox capacity, the liver is more susceptible to injury. So, the risk of liver damage rises when acetaminophen is taken with alcohol. The other statements aren’t correct because acetaminophen can interact with alcohol, and risk isn’t limited to very high doses or entirely absent with alcohol use.

It is only hepatotoxic at high doses but not with alcohol.

It never interacts with alcohol.