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12.1 Mechanism of Action Rabeprazole belongs to a class of antisecretory compounds (substituted benzimidazole proton-pump inhibitors) that do not exhibit anticholinergic or histamine H 2 -receptor antagonist properties, but suppress gastric acid secretion by inhibiting the gastric H + , K + ATPase at the secretory surface of the gastric parietal cell. Because this enzyme is regarded as the acid (proton) pump within the parietal cell, rabeprazole has been characterized as a gastric proton-pump inhibitor. Rabeprazole blocks the final step of gastric acid secretion. In gastric parietal cells, rabeprazole is protonated, accumulates, and is transformed to an active sulfenamide. When studied in vitro , rabeprazole is chemically activated at pH 1.2 with a half-life of 78 seconds. It inhibits acid transport in porcine gastric vesicles with a half-life of 90 seconds.

Rabeprazole sodium delayed-release tablets is a proton pump inhibitor (PPI) indicated in adults for: Healing of Erosive or Ulcerative Gastroesophageal Reflux Disease (GERD) ( 1.1 ). Maintenance of Healing of Erosive or Ulcerative GERD ( 1.2 ). Treatment of Symptomatic GERD ( 1.3 ). Healing of Duodenal Ulcers ( 1.4 ). Helicobacter pylori Eradication to Reduce Risk of Duodenal Ulcer Recurrence ( 1.5 ). Treatment of Pathological Hypersecretory Conditions, Including Zollinger-Ellison Syndrome ( 1.6 ). In adolescent patients 12 years of age and older for: Short-term Treatment of Symptomatic GERD ( 1.7 ). 1.1 Healing of Erosive or Ulcerative GERD in Adults Rabeprazole sodium delayed-release tablets are indicated for short-term (4 to 8 weeks) treatment in the healing and symptomatic relief of erosive or ulcerative gastroesophageal reflux disease (GERD). For those patients who have not healed after 8 weeks of treatment, an additional 8-week course of rabeprazole sodium delayed-release tablets may be considered. 1.2 Maintenance of Healing of Erosive or Ulcerative GERD in Adults Rabeprazole sodium delayed-release tablets are indicated for maintaining healing and reduction in relapse rates of heartburn symptoms in patients with erosive or ulcerative gastroesophageal reflux disease (GERD Maintenance). Controlled studies do not extend beyond 12 months. 1.3 Treatment of Symptomatic GERD in Adults Rabeprazole sodium delayed-release tablets are indicated for the treatment of daytime and nighttime heartburn and other symptoms associated with GERD in adults for up to 4 weeks. 1.4 Healing of Duodenal Ulcers in Adults Rabeprazole sodium delayed-release tablets are indicated for short-term (up to four weeks) treatment in the healing and symptomatic relief of duodenal ulcers. Most patients heal within four weeks. 1.5 Helicobacter pylori Eradication to Reduce the Risk of Duodenal Ulcer Recurrence in Adults Rabeprazole sodium delayed-release tablets, in combination with amoxicillin and clarithromycin as a three drug regimen, are indicated for the treatment of patients with H. pylori infection and duodenal ulcer disease (active or history within the past 5 years) to eradicate H. pylori . Eradication of H. pylori has been shown to reduce the risk of duodenal ulcer recurrence. In patients who fail therapy, susceptibility testing should be done....

Indication Recommended Dosage ( 2 ) Healing of Erosive or Ulcerative Gastroesophageal Reflux Disease (GERD) 20 mg once daily for 4 to 8 weeks Maintenance of Healing of Erosive or Ulcerative GERD* studied for 12 months 20 mg once daily* Symptomatic GERD in Adults 20 mg once daily for 4 weeks Healing of Duodenal Ulcers 20 mg once daily after morning meal for up to 4 weeks Helicobacter pylori Eradication to Reduce the Risk of Duodenal Ulcer Recurrence Three Drug Regimen: Rabeprazole sodium delayed-release tablets 20 mg Amoxicillin 1,000 mg Clarithromycin 500 mg All three medications should be taken twice daily with morning and evening meals for 7 days. Pathological Hypersecretory Conditions, Including Zollinger-Ellison Syndrome Starting dose 60 mg once daily then adjust to patient needs Symptomatic GERD in Adolescents 12 Years of Age and Older 20 mg once daily for up to 8 weeks Administration Instructions ( 2 ) : Swallow rabeprazole sodium delayed-release tablets whole. Do not chew, crush or split the tablets. For the treatment of duodenal ulcers take rabeprazole sodium delayed-release tablets after a meal. For Helicobacter pylori eradication take rabeprazole sodium delayed-release tablets with food. For all other indications rabeprazole sodium delayed-release tablets can be taken with or without food. Table 1 shows the recommended dosage of rabeprazole sodium delayed-release tablets in adults and adolescent patients 12 years of age and older. The use of rabeprazole sodium delayed-release tablets is not recommended for use in pediatric patients 1 year to less than 12 years of age because the lowest available tablet strength (20 mg) exceeds the recommended dose for these patients. Use another rabeprazole formulation for pediatric patients 1 year to less than 12 years of age. Table 1: Recommended Dosage and Duration of Rabeprazole Sodium Delayed-Release Tablets in Adults and Adolescents 12 Years of Age and Older * For those patients who have not healed after 8 weeks of treatment, an additional 8-week course of rabeprazole sodium delayed-release tablets may be considered. ** If symptoms do not resolve completely after 4 weeks, an additional course of treatment may be considered. *** Most patients heal within 4 weeks; some patients may require additional therapy to achieve healing....

Most common in adults (>2%) are pain, pharyngitis, flatulence, infection, and constipation ( 6.1 ). Most common in adolescents (≥2%) are headache, diarrhea, nausea, vomiting, and abdominal pain ( 6.1 ). To report SUSPECTED , contact Torrent Pharma Inc. at 1-800-912-9561 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch The following serious are described below and elsewhere in labeling: Acute Tubulointerstitial Nephritis [see ( 5.3 )] Clostridium difficile- Associated Diarrhea [see ( 5.4 )] Bone Fracture [see ( 5.5 )] Cutaneous and Systemic Lupus Erythematosus [ see ( 5.7 ) ] Cyanocobalamin (Vitamin B-12) Deficiency [see ( 5.8 )] Hypomagnesemia and Mineral Metabolism [see ( 5.9 )] Fundic Gland Polyps [see ( 5.11 )] 6.1 Clinical Studies Experience Because clinical trials are conducted under varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. Adults The data described below reflect exposure to rabeprazole sodium delayed-release tablets in 1,064 adult patients exposed for up to 8 weeks. The studies were primarily placebo- and active-controlled trials in adult patients with Erosive or Ulcerative Gastroesophageal Reflux Disease (GERD), Duodenal Ulcers and Gastric Ulcers. The population had a mean age of 53 years (range 18 to 89 years) and had a ratio of approximately 60% male: 40% female. The racial distribution was 86% Caucasian, 8% African American, 2% Asian, and 5% other. Most patients received either 10 mg, 20 mg or 40 mg per day of rabeprazole sodium delayed-release tablets. An analysis of appearing in ≥2% of patients treated with rabeprazole sodium delayed-release tablets (n=1,064) and with a greater frequency than placebo (n=89) in controlled North American and European acute treatment trials, revealed the following : pain (3% vs. 2%), pharyngitis (3% vs. 2%), pharyngitis (3% vs. 2%), flatulence (3% vs. 1%), infection (2% vs. 1%), and constipation (2% vs. 1%). Three long-term maintenance studies consisted of a total of 740 adult patients; at least 54% of adult patients were exposed to rabeprazole sodium delayed-release tablets for 6 months and at least 33% were exposed for 12 months....

Patients with a history of hypersensitivity to rabeprazole ( 4 ). PPIs, including rabeprazole sodium delayed-release tablets, are contraindicated in patients receiving rilpivirine-containing products ( 4 , 7 ). Refer to the section of the prescribing information for clarithromycin and amoxicillin, when administered in combination with rabeprazole sodium delayed-release tablets ( 4 ). Rabeprazole sodium delayed-release tablets are contraindicated in patients with known hypersensitivity to rabeprazole, substituted benzimidazoles, or to any component of the formulation. Hypersensitivity reactions may include anaphylaxis, anaphylactic shock, angioedema, bronchospasm, acute tubulointerstitial nephritis, and urticaria [see ( 5.3 ), ( 6 )] . PPIs, including rabeprazole sodium delayed-release tablets, are contraindicated with rilpivirine-containing products [see ( 7 )]. For information about of antibacterial agents (clarithromycin and amoxicillin) indicated in combination with rabeprazole sodium delayed-release tablets, refer to the section of their package inserts.