The hydroxymethylglutaryl-coenzyme A (HMG-CoA) reductase inhibitors, or statins, are the most potent, best tolerated and most widely used cholesterol lowering agents and represent some of the most commonly prescribed medications in the United States. HMG-CoA reductase is the rate limiting step in cholesterol synthesis by the liver, and inhibition of its activity causes a significant decrease in total and LDL cholesterol levels. The statins also have minor effects on triglyceride and HDL levels. Seven statins are available in the United States (year of approval and brand name in parentheses): lovastatin (1987: Mevacor), pravastatin (1991: Pravachol), simvastatin (1991: Zocor), fluvastatin (1993: Lescol), atorvastatin (1996: Lipitor), rosuvastatin (2003: Crestor) and pitavastatin (2009: Livalo). All 7 statins have been associated with mild-to-moderate serum aminotransferase elevations during therapy that are typically transient, asymptomatic and may resolve even with continuation without dose adjustment. All have also been associated rare instances of clinically apparent acute liver injury and the frequency of reports reflects, in some part, the frequency of their use. Nevertheless, the most reports have been with atorvastatin and simvastatin and the fewest with pravastatin and pitavastatin. The latency to onset variables considerably and can be more than 6 months or even several years after starting. The majority of cases are hepatocellular but cholestatic hepatitis is also well described for most statins. Cases with autoimmune features have been reported with atorvastatin, simvastatin, rosuvastatin and fluvastatin, as well as with combinations of these agents with ezetimibe. The following medications are discussed individually:
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by inhibition of the rate-limiting step in hepatic cholesterol
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Björnsson E, Olsson R. Suspected drug-induced liver fatalities reported to the WHO database. Dig Liver Dis 2006; 38: 33-8. PubMed Citation (In WHO database of fatal adverse drug reactions from 1968-2003, 4690 reports of drug induced liver fatality: none of the statins were in the top 20 suspected causes of acute liver failure due to medications).
Chalasani N, Fontana RJ, Bonkovsky HL, Watkins PB, Davern T, Serrano J, Yang H, Rochon J; Drug Induced Liver Injury Network (DILIN). Causes, clinical features, and outcomes from a prospective study of drug-induced liver injury in the United States. Gastroenterology 2008; 135: 1924-34. PubMed Citation (Among 300 cases of drug induced liver disease in the US collected from 2004 to 2008, statins represented 3% of cases overall including 3 cases attributed to atorvastatin, 3 simvastatin/ezetimibe, and one each to pravastatin, fluvastatin, and simvastatin).
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Hippisley-Cox J, Coupland C. Unintended effects of statins in men and women in England and Wales: population based cohort study using the QResearch database. BMJ 2010; 340: c2197. PubMed Citation (Among 225,922 new users of statins followed in a large UK healthcare database, the risk of moderate-to-severe liver dysfunction [ALT >3 times ULN] was increased in statin users compared to controls, relative risk ranging from 1.31-2.53 in women and 1.21-1.97 in men being highest with fluvastatin and lowest with pravastatin, more common with higher doses and usually arising within 6 months of starting).
Russo MW, Scobey M, Bonkovsky HL. Drug-induced liver injury associated with statins. Semin Liver Dis 2009; 29: 412-22. PubMed PubMed Citation (Review of statin hepatotoxicity and the several forms of liver injury that they can cause, including silent aminotransferase elevations, cholestatic and hepatocellular hepatitis and autoimmune hepatitis-like syndromes, all of which are rare).
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drug induced liver injury including 2 due to atorvastatin, 2 simvastatin and 2
cerivastatin, but none to other statins).
Björnsson E, Jacobsen EI, Kalaitzakis E. Hepatotoxicity associated with statins: reports of idiosyncratic liver injury post-marketing. J Hepatol 2012; 56:374-80. PubMed Citation (Between 1988 and 2010, the Swedish registry received 217 adverse event reports possibly related to statins, 124 [57%] being liver related, 73 of which could be evaluated; 2 were fatal and one led to liver transplant; 3 had positive rechallenge; 43 [59%] were hepatocellular, 22 [30%] cholestatic, and 8 [11%] mixed; 30 were due to atorvastatin, 28 simvastatin, 11 fluvastatin, 2 pravastatin and 2 rosuvastatin, arising after 30 to 248 days).
N, Bessone F, Sánchez A, di Pace M, Brahm J, Zapata R, A Chirino R, et al.
Profile of idiosyncratic drug induced liver injury in Latin America. An analysis
of published reports. Ann Hepatol 2014; 13: 231-9. PubMed Citation (Systematic review
of literature of drug induced liver injury in Latin American countries published
from 1996 to 2012 identified 176 cases, none of which were attributed to statins
or lipid lowering agents).
MW, Hoofnagle JH, Gu J, Fontana RJ, Barnhart H, Kleiner DE, Chalasani N, et al.
Spectrum of statin hepatotoxicity: Experience of the drug-induced liver injury
network. Hepatology 2014; 60: 679-86. PubMed Citation (Among 1,188
cases of drug induced liver disease collected in the US between 2004 to 2012, 22
[2%] were attributed to statins, including atorvastatin , simvastatin ,
rosuvastatin , fluvastatin , pravastatin  and lovastatin ; median
age was 60 years and 68% were women; 9 cases were cholestatic and 12
hepatocellular [6 with autoimmune features]; the latency ranged widely, from 1
month to 10 years; only one case was fatal [a man with preexisting cirrhosis
presenting with acute-on-chronic liver failure]).
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Task Force: 2014 update. J Clin Lipidol 2014; 8 (3 Suppl): S47-57. PubMed Citation (Review of the
safety of statins including their use in patients with liver disease
recommending that liver tests be obtained before therapy, but that routine
monitoring is not necessary and that statins can be safety used in patients with
nonalcoholic liver disease, and are probably safe in other forms of chronic
liver disease and after liver transplantation).
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stratified case-cohort study on statins and multiple adverse events in Japan.
PLoS One 2014; 9: e96919. PubMed Citation (Among 6877 patients
started on statins between 2008 and 2010, 139 developed an increase in ALT or
AST deemed likely due to the drug with no significant differences among those
treated with pra-, ator-, flu-, pita- or rosu-vastatin).
for lipids. Treat Guidel Med Lett 2014; 12 (137): 1-6. PubMed Citation (Concise
recommendations on management of hyperlipidemia mentions that 1-2% of patients
on high doses of statins develop ALT elevations [above 3 times ULN], but that
there is not always cross sensitivity to this side effect and that patients with
mild-to-moderate ALT elevations can tolerate statins; no discussion of
clinically apparent liver).
EV, Medina-Cáliz I, Hernando S, Ortega A, Martín-Ocaña F, Navarro JM, Peláez G,
et al. Hepatotoxicity associated with statin use: analysis of the cases included
in the Spanish Hepatotoxicity Registry. Rev Esp Enferm Dig 2014; 106: 246-54.
PubMed Citation (Among 858 cases of
drug induced liver injury enrolled in a Spanish Registry between 1994 and 2012,
47 [5.5%] were attributed to statins [16 atorvastatin, 13 simvastatin, 12
fluvastatin, 4 lovastatin and 2 pravastatin], usually with a hepatocellular
pattern of injury, 8.5% with autoimmune features, chronic injury in 19%, and no
liver related deaths).
N, Bonkovsky HL, Fontana R, Lee W, Stolz A, Talwalkar J, Reddy KR, et al.;
United States Drug Induced Liver Injury Network. Features and outcomes of 899
patients with drug-induced liver injury: The DILIN Prospective Study.
Gastroenterology 2015; 148: 1340-52.e7. PubMed Citation (Among
899 cases of drug induced liver injury enrolled in a US prospective study
between 2004 and 2013, 31 cases [3.4%] were attributed to statins, including 8
to atorvastatin, 8 simvastatin, 7 rosuvastatin, 4 pravastatin, 2 fluvastatin
and 2 lovastatin).
ES. Hepatotoxicity of statins and other lipid-lowering agents. Liver
2017; 37: 173-8. PubMed Citation (Review of the
hepatotoxicity of statins mentions that statins account for approximately 5% of cases of clinically apparent liver injury, atorvastatin has been the most
frequently implicated statin [accounting for 30-40% of cases] followed by simvastatin and fluvastatin; chronic injury lasting more than 6 months occurs in 18% of cases and fatalities are uncommon, usually the result of acute injury occurring in a patient with preexisting cirrhosis).
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