Nafcillin-Induced Hepatic Injury: A Case Report and Literature Review

Background: Drug-induced liver injury (DILI) is the most common cause of acute liver failure in the Western world. While it requires a diagnosis of exclusion, it is exceedingly prevalent in patients taking multiple hepatotoxic agents, the foremost of which are antibiotics, followed by herbal and dietary supplements. Below we will discuss a case of nafcillin-induced liver injury suggested by a thorough work-up and rule-out of other hepatic and biliary pathologies. Case presentation: We report the case of a 66-year-old white male who presented with painless jaundice. Clinical, laboratory and radiographic features demonstrated a cholestatic pattern of liver injury without significant abnormalities in the biliary tract. All workup for viral hepatitis and autoimmune diseases with liver involvement was negative. Liver biopsy showed acute necro-inflammatory changes suggestive of drug-induced liver injury. The patient had received 18 days of IV nafcillin for blood culture positive methicillin-susceptible Staphylococcus aureus (MSSA) four weeks prior to his presentation. He showed clinical and laboratory improvement of his liver functions with supportive care only. Conclusion: Nafcillin is a safe and effective antibiotic for the treatment of methicillin-susceptible Staphylococcal infections. However, physicians and prescribing healthcare professionals should be aware of the rare, but serious side effects, especially one of drug-induced liver injury with emphasis on the need for early cessation of nafcillin if liver function abnormalities develop.