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LiverTox: Clinical and Research Information on Drug-Induced Liver Injury [Internet]. Bethesda (MD): National Institute of Diabetes and Digestive and Kidney Diseases; 2012-.

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LiverTox: Clinical and Research Information on Drug-Induced Liver Injury [Internet].

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Tenofovir

Last Update: October 20, 2020.

OVERVIEW

Introduction

Tenofovir is an acyclic nucleotide analogue of adenosine used in combination with other agents in the therapy of the human immunodeficiency virus (HIV) and as single agent in hepatitis B virus (HBV) infection. Tenofovir does not appear to be a significant cause of drug induced liver injury.

Background

Tenofovir (ten of' oh vir) is an acyclic nucleotide analogue of adenosine, but is poorly absorbed orally. For this reason, the prodrug is used, either tenofovir disoproxil fumarate or more recently tenofovir alafenamide, which are well absorbed from the intestines, rapidly hydrolyzed to tenofovir intracellularly and then phosphorylated to the active form, tenofovir diphosphate. Tenofovir diphosphate is a competitive inhibitor of the HIV reverse transcriptase (and the HBV polymerase) and is also incorporated into the nascent DNA strand causing chain termination. Tenofovir disoproxil fumarate (TDF) was approved for use in HIV infection in the United States in 2001 and for use in hepatitis B in 2008. Tenofovir alafenamide (TAF) was approved in 2015 for use both in HIV and HBV infection. Clinical indications include treatment and prevention of HIV infection, usually in combination with other reverse transcriptase, protease or integrase inhibitors. Tenofovir is also approved for use in chronic hepatitis B as a single agent. TDF is available generically and under the brand name Viread in 300 mg oral tablets. TAF is available under the brand name Vemlidy in 25 mg tablets. Both TDF and TAF are also available in various fixed combinations with other antiviral agents for use in treatment of HIV infection, usually in a single oral daily dose that is often referred to as a “single tablet regimen” (STR) which is extremely helpful in insuring compliance with HIV therapy. Examples of some of the single tablet regimen combinations and their brand names and doses are given in the Table below. The recommended daily dose of TDF in adults is 300 mg and of TAF is 25 mg, the lower dose of TAF being considered important in decreasing long term side effects, particularly those on phosphate metabolism and bone and kidney effects. Side effects of tenofovir are not common but can include asthenia, diarrhea, flatulence, nausea and vomiting, headache, renal dysfunction and rash. Rare but potentially severe adverse events associated with long term therapy include lactic acidosis and liver failure when given with other antiretroviral agents, severe withdrawal flares of hepatitis B upon discontinuation of tenofovir therapy, osteoporosis, and phosphate wasting proximal tubular dysfunction, renal tubular acidosis and renal failure. The bone and renal effects of tenofovir are believed to be less common with TAF than TDF.

Table: Tenofovir Combination Single Tablet Regimens Approved for HIV Therapy*†

Brand Name#Drug #1Drug #2Drug #3Drug #4
Atripla3TDF 300Emtricitabine 200Efavirenz 600
Biktarvy3TAF 25Emtricitabine 200Bictegravir 50
Cimduo2TDF 300Lamivudine 300
Complera3TDF 300Emtricitabine 200Rilpivirine 25
Delstrigo3TDF 300Lamivudine 300Doravirine 100
Descovy2TAF 25Emtricitabine 200
Genvoya4TAF 10Emtricitabine 200Elvitegravir 25Cobicistat 150
Odefsey3TAF 25Emtricitabine 200Rilpivirine 25
Stribild4TDF 300Emtricitabine 200Elvitegravir 25Cobicistat 150
Symfi3TDF 300Lamivudine 300Efavirenz 600
Symfi Lo3TDF 300Lamivudine 300Efavirenz 400
Symtuza4TAF 10Emtricitabine 200Darunavir 800Cobicistat 150
Temixys2TDF 300Lamivudine 300
Truvada2TDF 300Emtricitabine 200

Abbreviations: TDF, tenofovir disoproxil fumarate; TAF, tenofovir alafenamide.

*

Dose given after each agent in mg/day.

†

The 2 drug regimens are tenofovir [TDF or TAF] with a nucleoside reverse transcriptase inhibitor; the 3 drug regimens add a nonnucleoside reverse transcriptase inhibitor, or an HIV protease inhibitor or an HIV integrase inhibitor to the 2 drug regimens; the 4 drug regimens add a CYP 3A4 inhibitor as a pharmacological enhancer.

Hepatotoxicity

Like all nucleoside analogues used as therapy of hepatitis B, tenofovir can cause transient increases in serum aminotransferases during or after therapy. These abnormalities appear to be due to an exacerbation or flare of the underlying hepatitis B. Three types of flares due to nucleoside analogue therapy have been described: transient flares during initiation of therapy (treatment flares), flares occurring in association with development of antiviral resistance (breakthrough flares) and flares occurring in the few months after stopping therapy (withdrawal flares). Treatment flares generally arise during the first few months of starting therapy, are usually mild, asymptomatic and self-limited and do not require dose modification or interruption of therapy. Breakthrough flares generally follow the development of antiviral resistance and subsequent rise in HBV DNA levels during nucleoside analogue therapy. Breakthrough flares can be symptomatic and severe. Because tenofovir is associated with a very low rate of antiviral resistance (<1% after 4 years), no convincing cases of breakthrough hepatitis have been linked to its use. Finally, sudden discontinuation of antiviral therapy is capable of causing a hepatitis B withdrawal flare. Withdrawal flares can be severe and several instances of acute liver failure resulting in death or the need for liver transplantation have been reported after stopping nucleoside analogue therapy. The rate of such flares after withdrawal of tenofovir therapy has not been clearly defined.

Tenofovir appears to have little or no direct hepatotoxicity. In patients without HBV and HIV infection, given tenofovir as a part of preexposure prevention, minor serum ALT and AST elevations are more frequent than with placebo, but are rarely above 5 times ULN (<1%). There have been no convincing reports of acute, clinically apparent liver injury attributable to tenofovir, although the combination of tenofovir and didanosine appears to lead to liver injury, with microvesicular fatty liver disease and lactic acidosis more commonly than didanosine with other antiretrovirals, perhaps because of drug-drug interactions. Tenofovir may also predispose to serum aminotransferase elevations during efavirenz therapy, again possibly because of drug-drug interactions.

Likelihood score: C (has been associated with flares of hepatitis when it is withdrawn and rarely with a sudden antiviral effect early during therapy and finally linked to episodes of lactic acidosis due to its effects on drug levels of other nucleosides that can cause lactic acidosis).

Mechanism of Injury

The majority of cases of lactic acidosis and hepatic failure in patients receiving tenofovir appear to be due to didanosine, stavudine or zidovudine coadministration. Addition of tenofovir to an antiretroviral regimen including didanosine concurrently can increase didanosine concentrations by up to 60%, thus amplifying its potential to cause mitochondrial injury. Tenofovir by itself appears to have little hepatotoxic potential.

Outcome and Management

The minor ALT elevations associated with initiation of tenofovir therapy in chronic hepatitis B are usually asymptomatic and transient. Care should be taken in stopping tenofovir therapy in patients with chronic HBV infection. If administered concurrently with tenofovir, didanosine should be reduced in dosage and patients monitored carefully.

Agents used in therapy of HBV infection include adefovir, emtricitabine, entecavir, lamivudine, telbivudine, tenofovir, interferon alfa and peginterferon.

Drug Class: Antiviral Agents, Antiretroviral Agents, Hepatitis B Agents

Other Drugs in the Subclass, Nucleoside Analogues: Abacavir, Adefovir, Didanosine, Emtricitabine, Entecavir, Lamivudine, Stavudine, Telbivudine, Zidovudine

CASE REPORTS

Case 1. Lactic acidosis arising during therapy with didanosine after addition of tenofovir.(1)

A 45 year old woman with HIV infection and chronic hepatitis C developed vomiting, abdominal pain, and obtundation 8 weeks after the addition of tenofovir to her long term antiretroviral regimen of stavudine and didanosine. Tenofovir was used to replace nevirapine, which was discontinued because of minor serum enzymes elevations which then returned to initial values. On admission, she was jaundiced and disoriented and had tender hepatomegaly. Serum bilirubin was 12.6 mg/dL, ALT 157 U/L, and an international normalized ratio (INR) was 2.1. She had lactic acidosis with blood pH of 7.24 and lactate levels of 16.4 mmol/L. Imaging of the liver suggested fatty infiltration. Antiretrovirals were discontinued, but the lactic acidosis and hepatic failure worsened and she died two days after admission.

Key Points

Medication:Didanosine, stavudine, and tenofovir
Pattern:Mild serum ALT elevations
Severity:5 (fatal)
Latency:8 weeks
Recovery:None
Other medications:Nevirapine, 8 weeks previously

Comment

Acute microvesicular hepatic steatosis with liver failure and lactic acidosis is a syndrome associated with several medications including the nucleoside analogues, particularly didanosine, stavudine and zidovudine. A similar syndrome occurs with intravenous tetracycline, aspirin (Reyes syndrome) and valproate, but the timing and course is different for those agents (shorter latency period), probably because they directly affect function of mitochondria rather than by causing functional failure by inhibition of mitochondrial replication and mitochondrial depletion. Mitochondria have a half-life of several weeks, so that inhibition of mitochondrial replication would be expected to lead to severe dysfunction (mitochondrial failure) after 2 to 3 months. Both didanosine and stavudine have been linked to many cases of hepatic steatosis and lactic acidosis and the addition of tenofovir appears to increase the risk of this complication. This syndrome has not been reported with the use of tenofovir alone. Other risk factors for hepatic steatosis with lactic acidosis include presence of underlying liver disease (such as hepatitis C), obesity and alcohol use.

Case 2. Transient flare of hepatitis B with initiation of tenofovir therapy.(2)

A 29 year old Asian-American woman was started on the combination of tenofovir and emtricitabine (Truvada) in a clinical trial of therapy of HBeAg-positive hepatitis B and developed a doubling of serum ALT levels to ~14 times the upper limit of normal within two weeks of starting therapy. At the same time, HBV DNA levels had fallen by four log10 IU (352 million to 36,160 IU/mL), but she remained HBsAg and HBeAg positive. Serum direct and total bilirubin levels increased slightly, but remained in the normal range. She had no symptoms of hepatitis and reported no other side effects. Tests for hepatitis A, C and D showed no evidence of de novo infection with these viruses. She was taking no other medications or herbal products. The dose of tenofovir and emtricitabine was not changed and, subsequently, her serum aminotransferase levels fell into the normal range and HBV DNA to undetectable. After 36 weeks of treatment, she became HBeAg-negative but did not develop anti-HBe. At one year, histologic evidence of inflammation and fibrosis had improved, but she remained HBsAg-positive and was continued on therapy.

Key Points

Medication:Tenofovir (300 mg) and emtricitabine (200 mg) daily
Pattern:Hepatocellular (ALT elevations only; R=14)
Severity:1+ (aminotransferase elevations without jaundice)
Latency:1 month
Recovery:2 weeks
Other medications:None

Laboratory Values

Weeks After
Starting		ALT
(U/L)		Alk P
(U/L)		Direct and Total
Bilirubin (mg/dL)		HBV DNA
(IU/mL)		Other
Pre261670.20.876,000,000
0272690.20.6352,000,000HBeAg +ve
2569950.31.036,100INR=1.06
426590.10.791
830450.00.728
1243430.10.5<10
2423520.20.6<10
3623820.10.5<10HBeAg -ve
4822620.20.6<10
Normal <40 <115 <0.3 <1.2 <10

Comment

A minor flare in hepatitis is not uncommon with initiation of antiviral therapy of hepatitis B and should not lead to dose modification, if HBV DNA levels are decreasing and no other cause for acute liver injury can be found. The flare of hepatitis probably represents an immunological reaction to the sudden decrease in HBV replication and may actually be a favorable sign, predictive of a serological and virological response (loss of HBeAg during treatment which occurred at 36 weeks).

PRODUCT INFORMATION

REPRESENTATIVE TRADE NAMES

Tenofovir (Tenofovir disoproxil fumarate) – Generic, Viread®

Tenofovir (Tenofovir alafenamide) – Generic, Vemlidy®

DRUG CLASS

Antiviral Agents

COMPLETE LABELING (Tenofovir disoproxil fumarate)

COMPLETE LABELING (Tenofovir alafenamide)

Product labeling at DailyMed, National Library of Medicine, NIH

CHEMICAL FORMULA AND STRUCTURE

DRUGCAS REGISTRY NUMBERMOLECULAR FORMULASTRUCTURE
Tenofovir 147127-20-6 C9-H14-N5-O4-P image 135078595 in the ncbi pubchem database

CITED REFERENCES

1.
Rivas P, Polo J, de Górgolas M, Fernández-Guerrero ML. Drug Points: Fatal lactic acidosis associated with tenofovir. BMJ. 2003;327:711. [PMC free article: PMC200801] [PubMed: 14512477]
2.
Case from the National Institutes of Health, Tenofovir Study Patient A2.

ANNOTATED BIBLIOGRAPHY

References updated: 20 October 2020

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    (Retrospective analysis of 227 patients with cirrhosis due to hepatitis B who were treated with lamivudine [n=74], entecavir [n=77] or tenofovir [n=72]; viral breakthrough occurred in 32% on lamivudine, 2.5% on entecavir, but none on tenofovir; no discussion of ALT flares).
  • Mandala J, Nanda K, Wang M, De Baetselier I, Deese J, Lombaard J, Owino F, et al. Liver and renal safety of tenofovir disoproxil fumarate in combination with emtricitabine among African women in a pre-exposure prophylaxis trial. BMC Pharmacol Toxicol. 2014;15:77. [PMC free article: PMC4297367] [PubMed: 25539648]
    (Among 2058 HIV-positive African women enrolled in a controlled trial of preexposure prophylaxis against HIV who were treated with tenofovir/emtricitabine vs placebo, minor elevations in creatinine and ALT were more frequent in those on antivirals but marked ALT elevations [above 5 times ULN] were rare and occurred in a similar proportion [8 women in both groups]).
  • Patil R, Ona MA, Papafragkakis H, Carey J, Moshenyat Y, Alhaddad A, Anand S. Acute liver toxicity due to efavirenz/ emtricitabine/tenofovir. Case Reports Hepatol. 2015;2015:280353. [PMC free article: PMC4487274] [PubMed: 26161275]
    (24 year old man with HIV infection developed hepatitis 2 months after starting a regimen of efavirenz with tenofovir and emtricitabine [bilirubin 0.6 mg/dL, ALT 1793 U/L], which resolved after switching from efavirenz to rilpivirine).
  • Habib G, Nashashibi M. Tenofovir-induced severe hepatitis in occult hepatitis B reactivation. Dig Liver Dis. 2015;47:898–9. [PubMed: 26346266]
    (56 year old man with B-cell lymphoma treated with rituximab-CHOP developed reactivation of hepatitis B but did not develop abnormal liver tests until treated with tenofovir, serum ALT rising from normal to 1418 U/L and bilirubin from normal to 18.6 mg/dL, then resolving when he was switched to entecavir).
  • Gowda C, Newcomb CW, Liu Q, Carbonari DM, Lewis JD, Forde KA, Goldberg DS, et al. Risk of acute liver injury with antiretroviral therapy by viral hepatitis status. Open Forum Infect Dis. 2017;4:ofx012. [PMC free article: PMC5407218] [PubMed: 28470014]
    (Among 10,083 patients with HIV followed after initiation of antiretroviral therapy, 206 [2%] developed de novo ALT elevations above 200 U/L but no instances of acute liver failure, elevations being more common among those with hepatitis B or C co-infection).
  • Kang MK, Park JG. Tenofovir disoproxil fumarate-induced severe liver injury in a patient with chronic hepatitis B virus infection. Dig Liver Dis. 2018;50:628–30. [PubMed: 29625906]
    (68 year old woman with cirrhosis due to hepatitis B developed a flare on starting therapy with tenofovir [ALT rising from 62 to 357 U/L, bilirubin 1.69 to 3.63 mg/dL], resolving on switching to entecavir and adefovir).

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