Rabeprazole is a proton pump inhibitor (PPI) and a potent inhibitor of gastric acidity used in the therapy of gastroesophageal reflux and peptic ulcer disease. Rabeprazole therapy is associated with a low rate of transient and asymptomatic serum aminotransferase elevations and is a rare cause of clinically apparent liver injury.
Rabeprazole (ra bep' ra zole), like other PPIs, binds to and inactivates 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. Rabeprazole 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. Rabeprazole was the third PPI approved for use in the United States (1999) and is widely used in the therapy of acid-peptic disease, including duodenal and gastric ulcer disease and gastroesophageal reflux. Rabeprazole is available in delayed release tablets of 20 mg in generic forms and under the brand name Aciphex. The typical dose for duodenal ulcer disease is 20 mg once daily for 4 to 8 weeks, with similar doses for long term maintenance therapy. Twice daily doses are used for more severe cases of gastrointestinal reflux and peptic ulcer disease, and doses of up to 120 mg daily for Zollinger-Ellison syndrome. Rabeprazole is very well tolerated. Side effects are uncommon and usually mild; they may include nausea, vomiting, abdominal discomfort, constipation, diarrhea, flatulence, skin rash, headaches and dizziness.
Despite its wide use, rabeprazole has only rarely been associated with hepatic injury. In large scale, long term trials of rabeprazole, serum ALT elevations occurred in less than 1% of patients and at rates similar to those with placebo or comparator drugs. In large case series of drug induced liver injury, rabeprazole has accounted for few instances of symptomatic acute liver injury. Only a few cases of clinically apparent liver disease due to rabeprazole have been published and the characteristics of the injury have not been well defined, but appear to be similar to the features of hepatic injury associated with other proton pump inibitors. Clinically apparent liver injury due to proton pump inhibitors typically arises within the first 4 weeks of treatment with symptoms of jaundice, nausea and fatigue and a hepatocellular or mixed pattern of serum enzyme elevations. Recovery is typically rapid upon withdrawal of the agent. Rash, fever and eosinophilia are rare, as is autoantibody formation. Instances of recurrence on rechallenge have been reported.
Likelihood score: D (possible rare cause of clinically apparent 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. Rabeprazole is metabolized predominantly by the CYP 2C19 microsomal drug-metabolizing enzyme and may interfere with clearance of other agents metabolized in a similar fashion.
Outcome and Management
The mild and asymptomatic elevations in serum aminotransferase that have been observed during rabeprazole therapy are usually transient and may resolve even without dose modification. Clinically apparent liver injury due to rabeprazole is rare, but calls for prompt withdrawal of the agent. Cases of acute liver failure due to proton pump inhibitor use have been described, but not specifically with rabeprazole. Recurrence of acute liver injury on rechallenge after an initial episode of clinically apparent liver injury with rabeprazole has been reported. There is no information about cross reactivity among the various PPIs after rabeprazole 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.
REPRESENTATIVE TRADE NAMES
Rabeprazole – Generic, Aciphex®
Product labeling at DailyMed, National Library of Medicine, NIH
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References updated: 10 May 2018
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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, but no antiulcer medication was listed in the top 40 causes).
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PubMed Citation (46 year old man developed jaundice one week after starting rabeprazole [bilirubin 8.3 mg/dL, ALT 374 U/L, Alk P 470 U/L], with resolution within 15 days of stopping and recurrence of jaundice within 3 days of restarting).
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Hernández 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 rabeprazole or other proton pump inhibitors).
Chalasani 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, 3 [0.3%] were attributed to proton pump inhibitors [omeprazole, esomeprazole and lansoprazole], but none to rabeprazole).
Tsai CF, Chen MH, Wang YP, Chu CJ, Huang YH, Lin HC, Hou MC, Let al.
Proton pump inhibitors increase risk for hepatic encephalopathy in patients With cirrhosis in a population study.
Gastroenterology 2017; 152: 134-41. PubMed Citation (Analysis of the Taiwan National Health Insurance database found a higher rate of proton pump inhibitor use among patients with cirrhosis who developed hepatic encephalopathy [38%: 445 of 1166] compared to a matched group with cirrhosis who did not [rate not provided]; the relative risk was raised for all agents except for rabeprazole).
Weersink RA, Bouma M, Burger DM, Drenth JPH, Froukje Harkes-Idzinga S, Hunfeld NGM, Metselaar HJ, et al.
Safe use of proton pump inhibitors in patients with cirrhosis.
Br J Clin Pharmacol 2018 Apr 24. Epub ahead of print]. PubMed Citation (Systematic review of 69 publications in the literature suggested that doses of proton pump inhibitors should be reduced in patients with cirrhosis and only omeprazole used in those with Child Pugh Class C cirrhosis).
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