Which medication is most commonly involved in overdose?

• A. Diphenhydramine
• B. Ibuprofen
• C. Acetaminophen
• D. Aspirin

Answer: (C)

The situation tests understanding why a very common over-the-counter medication is the one most often involved in overdoses. Acetaminophen is found in countless medicines—pain relievers, cold and flu remedies, sleep aids, and combination products—so people may take multiple products without realizing the total dose has become toxic. When the dose exceeds what the liver can safely process, a toxic metabolite builds up and injures liver cells, which can lead to serious liver failure if not treated promptly. Early overdose symptoms are nonspecific (nausea, vomiting, malaise), so cases can go unrecognized until damage is significant, helping explain why acetaminophen overdoses are the most common. Other options can cause overdose too, but they occur far less frequently in comparison; they tend to produce different patterns of symptoms and are less likely to be the primary cause of a widespread overdose problem.