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Get Permission Singh, SIngh, and Singh: Hepatotoxicity: A comprehensive review


Introduction

The liver assumes a significant part in the digestion and expulsion of medications. Detoxification of medications and xenobiotic in the liver by drug utilizing chemicals (DMEs) is a significant wonder in the securing of homeostasis.1 The liver is an imperative organ and its key area and multidimensional capacities uphold pretty much every other organ in the body. Liver is likewise the primary organ for digestion and disposal of medications.2 Poisonous hepatitis is the most extreme antagonistic response to antituberculosis drugs, it as a rule starts in the initial not many long stretches of treatment alongside liver rot, which may advance to encephalopathy and demise. Alcoholic liver illnesses with cirrhosis (development of stringy tissue in liver) brought about by unreasonable liquor utilization is a typical event. Liver can once in a while be harmed by certain synthetic substances called hepatotoxins. 3 Drug-induced liver injury (DILI) is the most continuous sign for drug withdrawal from the drug market because of its relationship with noteworthy antagonistic impacts, dismalness, and mortality. 4 DILI is liable for most of intense liver disappointment cases and is currently the main source for liver transplantation among patients. 5 It is critical to perceive that DILI is generally named characteristic (or direct) versus particular. Natural DILI is regularly portion related and happens in a huge extent of people presented to the medication (unsurprising) and beginning is inside a brief timeframe length (hours to days). 6

Table 1

Types of drug induced liver injury 7

Types

Prognosis

Enzymatic Profile

Hepatocellular

More Severe prognosis

Alanine transaminase >2ULN, Serum ALT/Serum Alk.

Cholestatic

More prone to chronic disease

Alk phos> 2 Upper limit of normal, Serum Alanine transaminase, serum Alk.

Mixed

More prone to chronic disease

Alanine transaminase > 2 Upper limit of normal, Phos between 2 & 5

Figure 1

Types of drug induced Hepatotoxicity7

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Types of liver diseases and its symptom

There are various types of liver disease mentioned bellow in the table.8, 9, 10

Table 2

Types of liver diseases and its symptom

Liver Disease

Characterization

Causes/Conditions of Disease

Acute liver failure

Reduction in liver function

Drugs, toxic chemicals, various liver diseases

Autoimmune related

Development of antibodies against self- liver cells, Inappropriate immune response against hepatic cells

Primary   biliary   cirrhosis,   Primary sclerosing cholangitis, Autoimmune hepatitis

Genetic disease

Gene mutations that causes liver injury

Hemochromatosis, Wilson's disease, deficiency of α-1 antitrypsin

Liver infections

Infections that leads to several type of liver damage and blockage of bile ducts

Viral hepatitis (Hepatitis A, B, C, D and E), Parasitic infections (yellow fever virus, herpes viruses)

Hepatitis (A,B,C,D and E)

Acute   or chronic liver damage

Hepatotropic viruses, alcohol assumption, drugs, xenobiotics, autoimmune disease, non-alcoholic fatty liver disease (NAFLD)

Liver cancer

Cancerous tumour in the liver

Increased risk of chronic Hepatitis ; hepatocellular carcinoma (HCC)

Hepatic vein obstruction

Blood clots obstruct , blood flow from the liver; development of symptoms such like jaundice enlarged liver, ascites, and abdominal pain

Hypercoagulable disorders, thrombosis of the hepatic vein, hepatic cancer, parasitic infection

Bile ducts obstruction

Blockage of bile ducts

Tumours, Gallbladder stones, inflammation, sudden physical injury

Table 3

Types of drug induced liver disease and its mechanism

Liver diseases

Drugs

Mechanism

Zonal necrosis

Paracetamol, carbon tetrachloride, Amatoxins

Cessation of protein synthesis due to the inhibition of RNA synthesis, largely confined to a particular zone of the liver lobule 1

Cholestasis

Chlorpromazine, estrogen, erythromycin and its derivatives 11

Impairment of bile flow, itching and jaundice. Injury to canalicular membrane and transporters (Kaplowitz; 2004).

Steatosis

Carbamazepine 12

Triglyceride accumulation which leads to either small droplet [micro vesicular] or large droplet [macro vesicular] fatty liver

Micro vesicular fats Non-alcoholic steatohepatitis Lactic acidosis

Didanosine, tetracycline, acetylsalicylic   acid, valproic acid Amiodarone, tamoxifen Zidovudine, riboflavin, metformin

Altered mitochondrial respiration, β- oxidation leads to lactic acidosis and triglyceride accumulation12

Granuloma

Diltiazem, sulfa drugs, quinidine

Granulomas located in periportal or portal areas and show features of systemic vasculitis and hypersensitivity, Macrophages, lymphocytes infiltrate hepatic lobule.

Vascular lesions/collapse 13

Nicotinic acid, cocaine, methylenedioxymeth amphetamine

Injury to the vascular endothelium/ Causes ischemic or hypoxic injury.

Oncogenesis

Oral   contraceptives, androgens

Encourages tumor formation 13

Veno- occlusive 14

Busulfan, cyclophosphamide

Injury to the hepatic venous endothelium.

Table 4

Therapeutic agents causing hepatotoxicity. 15, 16

Antimicrobial

Anti- epileptics

Analgesics and Anti- Tuberculosis drug

Immunomodulator

Others

Amoxicillin

Phenytoin

NSAIDs

Interferon- β

Methotrexate

Isoniazid

Lamotrigine

Rifampicin, Rifabutin

Interferon-α

Androgen- containing steroids

Sulfamethoxazole

Valproic Acid

Pyrazinamide

Anti-TNF agents Azathioprine

Amiodarone

Trimethoprim

Carbamazepine

Prothionamide

Cyclophosphamide

Inhaled anaesthetics

Conclusion

Drug induced Liver Injury harm goes from the unusual and non-portion identified with that happening typically after overdoses. It may include digestion to harmful, receptive intermediates, obstruction, with film transport or with cell natural chemistry, for example, protein amalgamation, or immunological instruments and contrasts in resistant responsiveness, hereditary, dietary and different variables. The liver is dependent upon expected harm from a gigantic exhibit of drug operators, Natural poisons, metals and metalloids, mycotoxins, endotoxins.

Acknowledgment

The authors acknowledge the chairman of Mr. Anil Chopra, Vice Chairperson Ms.Sangeeta Chopra & Pro-Chairman Mr. Prince Chopra, St. Soldier Group of Educational Society, Jalandhar for providing the necessary facilities to complete this review work.

Conflicts of Interest

All contributing authors declare no conflicts of interest.

Source of Funding

None.

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