Open Access Emerg Med. 2011 Oct 13;3:69-76. doi: 10.2147/OAEM.S24962. eCollection 2011.
Does cytochrome P450 liver isoenzyme induction increase the risk of liver toxicity after paracetamol overdose?.
Open access emergency medicine : OAEM
Sarbjeet S Kalsi, David M Wood, W Stephen Waring, Paul I Dargan
Affiliations
Affiliations
- Emergency Department, Guy's and St Thomas' NHS Foundation Trust, London;; Clinical Toxicology, Guy's and St Thomas' NHS Foundation Trust, London;
- Clinical Toxicology, Guy's and St Thomas' NHS Foundation Trust, London;
- York Teaching Hospital NHS Foundation Trust, York, UK.
PMID: 27147854
PMCID: PMC4753969 DOI: 10.2147/OAEM.S24962
Abstract
Paracetamol (acetaminophen, N-acetyl-p-aminophenol, 4-hydroxyacetanilide) is the most common cause of acute liver failure in developed countries. There are a number of factors which potentially impact on the risk of an individual developing hepatotoxicity following an acute paracetamol overdose. These include the dose of paracetamol ingested, time to presentation, decreased liver glutathione, and induction of cytochrome P450 (CYP) isoenzymes responsible for the metabolism of paracetamol to its toxic metabolite N-acetyl-p-benzoquinoneimine (NAPQI). In this paper, we review the currently published literature to determine whether induction of relevant CYP isoenzymes is a risk factor for hepatotoxicity in patients with acute paracetamol overdose. Animal and human in vitro studies have shown that the CYP isoenzyme responsible for the majority of human biotransformation of paracetamol to NAPQI is CYP2E1 at both therapeutic and toxic doses of paracetamol. Current UK treatment guidelines suggest that patients who use a number of drugs therapeutically should be treated as "high-risk" after paracetamol overdose. However, based on our review of the available literature, it appears that the only drugs for which there is evidence of the potential for an increased risk of hepatotoxicity associated with paracetamol overdose are phenobarbital, primidone, isoniazid, and perhaps St John's wort. There is no evidence that other drugs often quoted as increasing risk, such as carbamazepine, phenytoin, primidone, rifampicin, rifabutin, efavirenz, or nevirapine, should be considered risk factors for hepatotoxicity in patients presenting with acute paracetamol overdose.
Keywords: hepatotoxicity; isoenzymes; overdose; paracetamol
References
- Drug Metab Dispos. 1997 Oct;25(10):1165-75 - PubMed
- Lancet. 1990 Jun 23;335(8704):1526 - PubMed
- Clin Pharmacol Ther. 2000 Mar;67(3):275-82 - PubMed
- Pharmacology. 1974;12 (3):129-43 - PubMed
- Chem Res Toxicol. 2006 May;19(5):701-9 - PubMed
- QJM. 2008 Feb;101(2):121-5 - PubMed
- Biopharm Drug Dispos. 1999 Sep;20(6):285-91 - PubMed
- J Pharmacol Exp Ther. 1973 Oct;187(1):185-94 - PubMed
- Br Med J. 1966 Aug 27;2(5512):497-9 - PubMed
- Pediatrics. 1975 Jun;55(6):871-6 - PubMed
- Ugeskr Laeger. 1995 Feb 13;157(7):899-900 - PubMed
- Clin Pharmacol Ther. 1997 Jul;62(1):21-8 - PubMed
- Liver Transpl. 2002 Nov;8(11):1055-62 - PubMed
- Lancet. 1975 Sep 27;2(7935):579-81 - PubMed
- Drug Metab Dispos. 2003 Mar;31(3):282-8 - PubMed
- Hepatology. 2005 Dec;42(6):1364-72 - PubMed
- Toxicol Appl Pharmacol. 1998 Sep;152(1):193-9 - PubMed
- Drug Metab Rev. 2011 Feb;43(1):41-52 - PubMed
- Br J Clin Pharmacol. 1981 Aug;12(2):149-53 - PubMed
- Br J Clin Pharmacol. 2004 Apr;57(4):495-9 - PubMed
- Antimicrob Agents Chemother. 1997 May;41(5):924-6 - PubMed
- Xenobiotica. 2009 Jan;39(1):11-21 - PubMed
- Clin Pharmacol Ther. 1974 Oct;16(4):676-84 - PubMed
- Clin Pharmacol Ther. 1993 Aug;54(2):142-9 - PubMed
- Clin Pharmacol Ther. 2002 Sep;72(3):276-87 - PubMed
- Lancet. 1995 Aug 26;346(8974):547-52 - PubMed
- J Pharmacol Exp Ther. 1987 Nov;243(2):565-70 - PubMed
- Drug Metab Lett. 2010 Dec;4(4):185-94 - PubMed
- BMJ. 1990 Oct 27;301(6758):964-6 - PubMed
- J Hepatol. 2009 Feb;50(2):306-13 - PubMed
- Clin Pharmacol Ther. 1997 Jan;61(1):24-34 - PubMed
- Emerg Med J. 2002 May;19(3):202-5 - PubMed
- Dig Dis Sci. 2005 Oct;50(10):1836-8 - PubMed
- Med J Aust. 2008 Mar 3;188(5):296-301 - PubMed
- J Toxicol Clin Toxicol. 1999;37(6):753-7 - PubMed
- Pharmacology. 1985;30(2):100-8 - PubMed
- Lancet. 1971 Mar 13;1(7698):519-22 - PubMed
- Dig Dis Sci. 2007 Jan;52(1):208-9 - PubMed
- Clin Pharmacol Ther. 2001 Oct;70(4):317-26 - PubMed
- Pharmacology. 1974;12(4-5):251-71 - PubMed
- J Gastroenterol Hepatol. 1999 Aug;14(8):817-21 - PubMed
- J Pharm Pharmacol. 1968 Jan;20(1):64-7 - PubMed
- Biochem Biophys Res Commun. 1994 Aug 30;203(1):532-9 - PubMed
- Biochem Pharmacol. 1993 Apr 22;45(8):1563-9 - PubMed
- Curr Drug Metab. 2010 Mar;11(3):276-82 - PubMed
- Eur J Clin Pharmacol. 1996;50(5):411-5 - PubMed
- Can J Gastroenterol. 2002 Oct;16(10):672-6 - PubMed
- Drug Metab Dispos. 2007 Jul;35(7):1223-31 - PubMed
- Biochem Biophys Res Commun. 2002 Mar 8;291(4):1089-94 - PubMed
- Chem Res Toxicol. 1998 Apr;11(4):295-301 - PubMed
- Hum Exp Toxicol. 1992 Jul;11(4):265-70 - PubMed
- Ann Intern Med. 2002 Dec 17;137(12):947-54 - PubMed
- J Pharmacol Exp Ther. 1987 Feb;240(2):578-83 - PubMed
- Drugs. 1983 Mar;25(3):290-314 - PubMed
- Proc Natl Acad Sci U S A. 1984 Mar;81(5):1327-31 - PubMed
- Hum Toxicol. 1988 Jan;7(1):33-4 - PubMed
- Toxicol Sci. 2005 Sep;87(1):146-55 - PubMed
- Cochrane Database Syst Rev. 2006 Apr 19;(2):CD003328 - PubMed
- Aliment Pharmacol Ther. 1993 Oct;7(5):477-85 - PubMed
- JAMA. 2003 Sep 17;290(11):1500-4 - PubMed
- Ann Intern Med. 1984 Sep;101(3):403 - PubMed
- Br J Clin Pharmacol. 1979 Feb;7(2):201-6 - PubMed
- J Clin Pharmacol. 2004 Nov;44(11):1273-81 - PubMed
- Br Med J. 1966 Aug 27;2(5512):506-7 - PubMed
- Drug Metab Dispos. 2000 Dec;28(12):1397-400 - PubMed
- J Pharmacol Exp Ther. 1973 Oct;187(1):203-10 - PubMed
- Arch Biochem Biophys. 1989 Jun;271(2):270-83 - PubMed
- Mol Pharmacol. 1980 Nov;18(3):536-42 - PubMed
- Ugeskr Laeger. 1996 Nov 25;158(48):6892-5 - PubMed
- Gut. 1975 Oct;16(10):838 - PubMed
- Ann Emerg Med. 2007 Sep;50(3):292-313 - PubMed
- Drug Metab Dispos. 2009 Aug;37(8):1611-21 - PubMed
- Gastroenterology. 1989 Aug;97(2):439-45 - PubMed
- J Med Chem. 1982 Aug;25(8):885-6 - PubMed
- Drug Metab Dispos. 2002 Jul;30(7):795-804 - PubMed
- J Pharmacol Exp Ther. 1973 Oct;187(1):211-7 - PubMed
Publication Types