The antidote for acetaminophen is acetylcysteine. The normal therapeutic serum level of acetaminophen is 10 to 20 mcg/mL(40 to 79 mcmol/L). Atoxic level is higher than 50 mcg/mL(200 mcmol/L), and levels higher than 100 mcg/mL (400 mcmol/L) could indicate hepatotoxicity. Auranofin is a gold preparation that may be used to treat rheumatoid arthritis. Pentostatin and fludarabine are antineoplastic agents.