Review Question - QID 215150

A 25-year-old man presents to the emergency department with malaise. He states that he has not been feeling well for several weeks and has had a cough, low-grade fever, and runny nose. His doctor told him to take acetaminophen for his symptoms. He admits to taking triple the recommended dose of acetaminophen for the past several weeks. Today, the patient has noticed he feels nauseous but has not vomited. His temperature is 97.7°F (36.5°C), blood pressure is 114/64 mmHg, pulse is 89/min, respirations are 12/min, and oxygen saturation is 98% on room air. Physical exam reveals a young, healthy-appearing man who is not in any distress. Laboratory studies are ordered as seen below.

Hemoglobin: 13 g/dL
Hematocrit: 39%
Leukocyte count: 7,500/mm^3 with normal differential
Platelet count: 221,000/mm^3

Serum:
Na+: 139 mEq/L
Cl-: 100 mEq/L
K+: 4.2 mEq/L
HCO3-: 24 mEq/L
Blood urea nitrogen (BUN): 22 mg/dL
Glucose: 77 mg/dL
Creatinine: 1.2 mg/dL
Aspartate aminotransferase (AST): 92 U/L
Alanine aminotransferase (ALT): 100 U/L

Which of the following is the most appropriate next step in the management of this patient?