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DRUG RECORD

 

PANTOPRAZOLE

OVERVIEW
Pantoprazole

 

Introduction

Pantoprazole is a proton pump inhibitor (PPI) and a potent inhibitor of gastric acidity which is widely used in the therapy of gastroesophageal reflux and peptic ulcer disease.  Pantoprazole therapy is associated with a low rate of transient and asymptomatic serum aminotransferase elevations and is a rare cause of clinically apparent liver injury.

 

Background

Pantoprazole, (pan toe' pra zole) like other PPIs, blocks gastric acid production by binding to and inactivating the H+/K+-ATPase of gastric parietal cells, causing inhibition of the proton pump that transports H+ into the gastric lumen, the final common step in gastric acid production.  Pantoprazole is a prodrug and is converted to the active form in the acidic secretory canaliculi of parietal cells.  Because the inhibition is irreversible, acid secretion is suppressed for 24 to 48 hours, until new proton pump molecules have been synthesized and transported to the cell membrane.  Pantoprazole was the fourth PPI approved for use in the United States (2000) and now is in wide use.  Pantoprazole is available as delayed release tablets of 20 and 40 mg, and in 40 mg vials for parenteral use generically and under the brand name of Protonix.  The typical dose of pantoprazole for peptic ulcer disease is 40 mg once daily for 4 to 8 weeks with similar long term maintenance doses.  Twice daily doses are recommended for more severe cases of gastrointestinal reflux and peptic ulcer disease, and doses of up to 240 mg daily for Zollinger-Ellison syndrome.  Pantoprazole is very well tolerated.  Side effects are uncommon and usually mild, and include diarrhea, nausea, vomiting, abdominal discomfort, flatulence, skin rash, headaches and dizziness.

 

Hepatotoxicity

Despite its wide use, pantoprazole has only rarely been associated with hepatic injury.  In large scale, long term trials of pantoprazole, serum ALT elevations have occurred in less than 1% of patients and at rates similar to those that occur with placebo or comparator drugs.  Only a small number of cases of clinically apparent liver disease attributed to pantoprazole have been published, but the clinical pattern of injury has resembled acute hepatic necrosis which has been described with other proton pump inhibitors.  Clinically apparent liver injury due to proton pump inhibitors generally arises within the first 4 weeks of therapy and is characterized by an acute hepatocellular pattern of injury with rapid recovery upon withdrawal.  Rash, fever and eosinophilia are rare, as is autoantibody formation.  In large case series of drug induced liver injury, pantoprazole has accounted for few instances of symptomatic acute liver injury.

 

Mechanism of Injury

The acute onset and rapid recurrence of hepatic injury with proton pump inhibitors suggests a hypersensitivity reaction, but may merely reflect altered metabolism or acute toxicity of a metabolic byproduct.  Pantoprazole is metabolized predominantly by hepatic CYP 2C19 with lesser metabolism by CYP 3A4.  Drug interactions may occur with agents that share these pathways of metabolism.

 

Outcome and Management

The mild and asymptomatic elevations in serum aminotransferase that have been observed during pantoprazole therapy are usually transient and may resolve even without dose modification.  Clinically apparent liver injury due to pantoprazole is rare, but calls for prompt withdrawal of the agent.  Cases of acute liver failure due to proton pump inhibitors have been described, but are exceedingly rare.  There is no information about cross reactivity among the various PPIs after pantoprazole hepatotoxicity, but the PPIs all share a benzimidazole structure, and caution should be used in attempting to reintroduce another PPI after clinically apparent PPI associated hepatic injury.

 

Drug Class:  Antiulcer Agents

 

Other Drugs in the Subclass, Proton Pump InhibitorsDexlansoprazole, Esomeprazole, Lansoprazole, Omeprazole, Rabeprazole

 

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CASE REPORT
Pantoprazole

 

Case 1.  Acute liver injury due to pantoprazole.
[Modified from:  Cordes A, Vogt W, Maier KP. [Pantoprazole-induced hepatitis]. Dtsch Med Wochenschr 2003; 128: 611-4. German. PubMed Citation]

 

A 46 year old woman with symptoms of gastroesophageal reflux developed epigastic pain 8 days after starting pantoprazole.  She denied jaundice, dark urine, fever, rash or poor appetite.  She had no history of liver disease, jaundice, alcohol abuse or risk factors for viral hepatitis.  She took no other medications.  Her serum aminotransferase levels had been normal 3 days previously when she underwent a routine upper endoscopy under midazolam anesthesia (which showed changes suggestive of gastroesophageal reflux disease).  On examination, she had no fever, jaundice, rash, hepatomegaly or tenderness.  Laboratory tests showed moderate elevations in serum aminotransferase levels and bilirubin of 1.0 mg/dL (Table).  The alkaline phosphatase levels were normal, but lactic dehydrogenase was slightly elevated (LDH 686 U/L, normal <240).  The white blood cell count was normal without eosinophilia.  Tests for hepatitis A, B and C and for autoantibodies were negative.  An ultrasound showed a gallstone without evidence of biliary obstruction.  Pantoprazole was stopped.  Serum bilirubin and ALT levels rose for a day and then began to fall and were near normal one week later.  A liver biopsy was not done and she was not reexposed to pantoprazole or other proton pump inhibitors.

 

Key Points

Medication:Pantoprazole (dose not given)
Pattern: Hepatocellular (R=37)
Severity: 3+ (jaundice, hospitalization)
Latency: 8 days to onset of symptoms, 9 days to jaundice
Recovery: ~2 weeks
Other medications:Intravenous midazolam, 3 days before onset

Laboratory Values

Time After Starting Time After Stopping ALT (U/L) Alk P (U/L) Bilirubin (mg/dL) Other
5 days 0 12 13 Upper endoscopy
8 days 0 359 175 1.0 Epigastric pain
9 days 1 day 590 190 3.5 Jaundice
10 days 2 days 555 180 2.5
12 days 4 days 310 170 0.6
17 days 9 days 100 100 0.5 Discharged
Normal Values <17 <130 <1.2

* Values estimated from Figure 1.

Comment

This patient developed a mild hepatitis-like syndrome within 8-9 days of starting pantoprazole.  The pattern of serum enzyme elevations was hepatocellular, but the LDH elevation suggested an acute hepatic necrosis-like clinical picture, which was further supported by the rapidity of improvement on stopping pantoprazole.  Other possibilities were that the injury was due to midazolam anesthesia or to an undocumented episode of hypotension during the upper endoscopy, but both of those possibilities are unlikely.  The signature pattern of short latency to onset of an acute hepatic necrosis with prompt improvement on stopping is typical of proton pump associated hepatotoxicity.

 

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PRODUCT INFORMATION
Pantoprazole

 

REPRESENTATIVE TRADE NAMES
Pantoprazole – Generic, Protonix®

 

DRUG CLASS
Antiulcer Agents

 

COMPLETE LABELING

Product labeling at DailyMed, National Library of Medicine, NIH

 

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DRUG CAS REGISTRY NUMBER MOLECULAR FORMULA STRUCTURE
Pantoprazole 102625-70-7 C16-H15-F2-N3-O4-S Pantoprazole Chemical Structure

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REFERENCES
Pantoprazole

 

References Last Updated: 15 January 2014

  1. Zimmerman HJ. Proton pump inhibitors. In, Zimmerman HJ. Hepatotoxicity: the adverse effects of drugs and other chemicals on the liver. 2nd ed. Philadelphia: Lippincott, 1999, pp. 720-1.  (Expert review of hepatotoxicity published in 1999 states that aminotransferase elevations occur in ~1% of PPI treated patients and only 1 case of acute liver injury reported with omeprazole, none with the more recently released lansoprazole and pantoprazole).

  2. Wallace JL, Sharkey KA. Pharmacotherapy of gastric acidity, peptic ulcers, and gastroesophageal reflux disease. In, Brunton LL, Chabner BA, Knollman BC, eds. Goodman & Gilman's the pharmacological basis of therapeutics. 12th ed. New York: McGraw-Hill, 2011, pp. 1309-22.  (Textbook of pharmacology and therapeutics).

  3. Arnold R. Safety of proton pump inhibitors--an overview. Aliment Pharmacol Ther 1994; 8 Suppl 1: 65-70. PubMed Citation  (Side effects of PPIs are uncommon and no more frequent than with cimetidine and ranitidine; "Omeprazole had no clinically relevant effects on laboratory values including...liver function").

  4. Yusoff IF, Nairn P, Morgan CA. Multiple organ failure related to pantoprazole. Aust N Z J Med 1999; 9: 33-4. PubMed Citation  (68 year old with ulcer disease developed muscle aches, shortness of breath and abdominal pain 2 days after being switched from famotidine to pantoprazole [bilirubin 4.1 mg/dL, ALT 4080 U/L, Alk P 261 U/L, CPK 12,210 U/L, INR 3.1, lactate 7 mmol, creatinine 4.1 mg/dL], recovered within 2 weeks of stopping).

  5. Reilly JP. Safety profile of the proton-pump inhibitors. Am J Health Syst Pharm 1999; 56(23 Suppl 4): S11-7. PubMed Citation  (Review of side effects of proton pump inhibitors including long term tolerance).

  6. Martin RM, Dunn NR, Freemantle S, Shakir S. The rates of common adverse events reported during treatment with proton pump inhibitors used in general practice in England: cohort studies. Br J Clin Pharmacol 2000; 50: 366-72. PubMed Citation  (Prescription event monitoring of common side effects of omeprazole, lansoprazole and pantoprazole from the UK found low rates of diarrhea [0.18-0.39/1000 days], abdominal pain [0.17-.21], nausea [0.16-0.22] and headache [0.10-0.17]; no analysis of liver toxicities).

  7. Wilton LV, Key C, Shakir SA. The pharmacovigilance of pantoprazole: the results of postmarketing surveillance on 11 541 patients in England. Drug Saf 2003; 26: 121-32. PubMed Citation  (Prescription event monitoring among general practitioners in the UK during 6 months after launch of pantoprazole found low rate of adverse events, most common being diarrhea, nausea, headache and dizziness; among 12,521 forms returned, were 8 cases of jaundice and 2 of abnormal liver tests, but no details provided).

  8. Cordes A, Vogt W, Maier KP. [Pantoprazole-induced hepatitis]. Dtsch Med Wochenschr 2003; 128: 611-4. German. PubMed Citation  (46 year old developed abdominal pain 8 days after starting pantoprazole [bilirubin <1.0 mg/dL, ALT 359 U/L, Alk P normal], resolving within 12 days of stopping).

  9. Wellhöfer B. [Pantoprazole-induced hepatitis]. Dtsch Med Wochenschr 2003; 128: 1502; author reply 1502. German. PubMed Citation  (Letter in response to Cordes [2003] suggesting that the hepatic injury may have been due to cholelithiasis and would have warranted endoscopic retrograde pancreatocholangiography).

  10. Russo MW, Galanko JA, Shrestha R, Fried MW, Watkins P. Liver transplantation for acute liver failure from drug-induced liver injury in the United States. Liver Transpl 2004; 10: 1018-23. PubMed Citation  (Among ~50,000 liver transplants reported to UNOS between 1990 and 2002, 270 [0.5%] were done for drug induced acute liver failure, but none were attributed to an H2 blocker or proton pump inhibitor).

  11. de Abajo FJ, Montero D, Madurga M, García Rodríguez LA. Acute and clinically relevant drug-induced liver injury: a population based case-control study. Br J Clin Pharmacol 2004; 58: 71-80. PubMed Citation  (Analysis of General Practice Research Database from UK on 1.6 million persons from 1994-2000 found 128 cases of drug induced liver injury [2.4/100,000 person years]; 3 cases were attributed to cimetidine for an odds ratio of 2.0 compared to controls [n=5000] which was not statistically significant).

  12. Björnsson E, Jerlstad P, Bergqvist A, Olsson R. Fulminant drug-induced hepatic failure leading to death or liver transplantation in Sweden. Scand J Gastroenterol 2005; 40: 1095-101. PubMed Citation  (Survey of all cases of DILI with fatal outcome from Swedish Adverse Drug Reporting system from 1966-2002: 103 cases identified as highly probable, probable or possible, one case attributed to ranitidine and one to omeprazole, but none to the other antiulcer agents).

  13. Darabi K. Proton-pump-inhibitor-induced hepatitis. South Med J 2005; 98: 844-5. PubMed Citation  (39 year old developed fatigue and abdominal pain 2 weeks after starting pantoprazole [bilirubin 1.2 mg/dL, ALT 3061 U/L, Alk P 89 U/L], which gradually resolved after drug was stopped).

  14. Salgueiro E, Rubio T, Hidalgo A, Manso G. Safety profile of proton pump inhibitors according to the spontaneous reports of suspected adverse reactions. Int J Clin Pharmacol Ther 2006; 44: 548-56. PubMed Citation  (Analysis of PPI related reports to Spanish Pharmacovigilance Database during 2004 found 58 reports of liver injury from omeprazole [n=36], lansoprazole [7], pantoprazole [12], rabeprazole [2] and esomeprazole [1], correlating somewhat with relative number of prescriptions; 82% were taking other medications; most "evolved to recovery").

  15. Sabaté M, Ibáñez L, Pérez E, Vidal X, Buti M, Xiol X, Mas A et al. Risk of acute liver injury associated with the use of drugs: a multicentre population survey. Aliment Pharmacol Ther 2007; 25:1401-9. PubMed Citation  (Population based survey of 126 cases of acute liver injury due to drugs between 1993-1999 in Spain; 8 were attributed to ranitidine alone [incidence 5.1/100,000 person-years] and 5 to omeprazole alone [2.1/100,000], no mention of pantoprazole).

  16. 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 between 2004 and 2008, 2 were attributed to ranitidine, none to cimetidine or the proton pump inhibitors).

  17. Sandig C, Flechtenmacher C, Stremmel W, Eisenbach C. Pantoprazole induces severe acute hepatitis. Z Gastroenterol 2011; 49: 207-10. PubMed Citation  (52 year old woman developed jaundice 1 month after starting pantoprazole [bilirubin 4.8 mg/dL, ALT 1276 U/L, Alk P 196 U/L], resolving within 2 months of stopping).

  18. Ferrajolo C, Capuano A, Verhamme KM, Schuemie M, Rossi F, Stricker BH, Sturkenboom MC. Drug-induced hepatic injury in children: a case/non-case study of suspected adverse drug reactions in VigiBase. Br J Clin Pharmacol 2010; 70: 721-8. PubMed Citation  (World wide pharmacovigilance database contained 9036 hepatic adverse drug reactions in children, no antiulcer medication was listed in the top 40 causes).

  19. Reuben A, Koch DG, Lee WM; Acute Liver Failure Study Group. Drug-induced acute liver failure: results of a U.S. multicenter, prospective study. Hepatology 2010; 52: 2065-76. PubMed Citation  (Among 1198 patients with acute liver failure enrolled in a US prospective study between 1998 and 2007, 133 were attributed to drug induced liver injury, but none were linked to pantoprazole or other antiulcer medications).

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Pantoprazole
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