Tylenol metabolism liver or kidney?

Is Tylenol (acetaminophen) mainly processed by the liver or the kidneys?

Tylenol (acetaminophen) is primarily metabolized in the liver. The liver breaks it down into harmless products, with a small fraction converted into a reactive substance that must be detoxified by the liver’s glutathione system. If too much acetaminophen is taken, the detoxifying capacity can be overwhelmed, which can lead to liver injury. [1]

What role do the kidneys play with Tylenol?

The kidneys mainly help by clearing breakdown products (metabolites) after the liver has processed acetaminophen. The kidney is not the primary site of acetaminophen metabolism. [1]

How does liver vs kidney damage change acetaminophen risk?

• If liver function is impaired, acetaminophen can be more dangerous because the liver is less able to detoxify the reactive intermediate. [1]
  
• Kidney disease can affect how metabolites are cleared, but acetaminophen’s metabolic “work” still happens largely in the liver. [1]
  
  

Why does acetaminophen dosing matter if the kidneys are okay?

Because the main toxicity risk is liver-related, dosing and total daily amount (including combination products that also contain acetaminophen) matter most for safety. Excess acetaminophen can increase the amount of the reactive metabolite the liver must handle. [1]

Does alcohol affect Tylenol metabolism?

Alcohol can increase acetaminophen toxicity risk by changing how acetaminophen is processed and by affecting the liver’s defenses, including glutathione availability. [1]

Sources
[1] https://medlineplus.gov/druginfo/meds/a682657.html