Is Tylenol Safe During Pregnancy? Understanding Risk Factors Seeking Health USMLE Step 2 CK Question of the Day: Altered Mental State After Over the counter pain reliever and Prescription Hydrocodone acetaminophen Osmosis Blog Figure 1 from Acetaminophen toxicity and 5 oxoproline (pyroglutamic acid): a tale of two cycles, one an ATP depleting futile cycle and the other a useful cycle. Semantic Scholar Acetaminophen, also known as Tylenol, is used to help with pain & to reduce fever. However, taking too much acetaminophen can be harmful to the liver which filters out toxins &