OMEPRAZOLE/BICARBONATE

Omeprazole and sodium bicarbonate is a combination of omeprazole, a proton-pump inhibitor, and sodium bicarbonate, an antacid. Omeprazole is a substituted benzimidazole, 5-methoxy-2-[[(4-methoxy-3,5dimethyl-2-pyridinyl)methyl]sulfinyl]-1 H -benzimidazole, a racemic mixture of two enantiomers that inhibits gastric acid secretion. Its empirical formula is C 17 H 19 N 3 O 3 S, with a molecular weight of 345.42. The structural formula is: Omeprazole, USP is a white or almost white powder which melts with decomposition at about 155°C. Soluble in dichloromethane, practically insoluble in water. The stability of omeprazole is a function of pH; it is rapidly degraded in acid media, but has acceptable stability under alkaline conditions. Omeprazole and sodium bicarbonate is supplied as immediate-release capsules. Each capsule contains either 40 mg or 20 mg of omeprazole and 1100 mg of sodium bicarbonate with the following excipients: croscarmellose sodium and sodium stearyl fumarate. The capsules consist of gelatin and titanium dioxide. In addition the 20 mg/1100 mg capsule shell contains sodium lauryl sulfate and the 40 mg/1100 mg capsule shell contains FD&C Blue 1. The capsules are printed with edible ink containing black iron oxide, butyl alcohol, dehydrated alcohol, isopropyl alcohol, propylene glycol, potassium hydroxide, shellac and strong ammonia solution. Chemical Structure

Omeprazole and sodium bicarbonate is a proton pump inhibitor (PPI) indicated for: • Short-term treatment of active duodenal ulcer ( 1.1 ) • Short-term treatment of active benign gastric ulcer ( 1.2 ) • Treatment of gastroesophageal reflux disease (GERD) ( 1.3 ) • Maintenance of healing of erosive esophagitis ( 1.4 ) The safety and effectiveness of omeprazole and sodium bicarbonate capsules in pediatric patients (<18 years of age) have not been established. ( 8.4 ) 1.1 Duodenal Ulcer Omeprazole and sodium bicarbonate is indicated for short-term treatment of active duodenal ulcer. Most patients heal within four weeks. Some patients may require an additional four weeks of therapy. [See Clinical Studies (14.1) .] 1.2 Gastric Ulcer Omeprazole and sodium bicarbonate is indicated for short-term treatment (4-8 weeks) of active benign gastric ulcer. [See Clinical Studies (14.2) .] 1.3 Treatment of Gastroesophageal Reflux Disease (GERD) Symptomatic GERD Omeprazole and sodium bicarbonate is indicated for the treatment of heartburn and other symptoms associated with GERD for up to 4 weeks. [See Clinical Studies (14.3) .] Erosive Esophagitis Omeprazole and sodium bicarbonate is indicated for the short-term treatment (4-8 weeks) of erosive esophagitis which has been diagnosed by endoscopy. The efficacy of omeprazole and sodium bicarbonate used for longer than 8 weeks in these patients has not been established. If a patient does not respond to 8 weeks of treatment, it may be helpful to give up to an additional 4 weeks of treatment. If there is recurrence of erosive esophagitis or GERD symptoms (e.g., heartburn), an additional 4-8 week courses of omeprazole and sodium bicarbonate may be considered. [See Clinical Studies (14.3) .] 1.4 Maintenance of Healing of Erosive Esophagitis Omeprazole and sodium bicarbonate is indicated to maintain healing of erosive esophagitis. Controlled studies do not extend beyond 12 months. [See Clinical Studies (14.4) .]

Omeprazole and sodium bicarbonate is available as a capsule in 20 mg and 40 mg strengths of omeprazole for adult use. Directions for use for each indication are summarized in Table 1 . All recommended doses throughout the labeling are based upon omeprazole. Since both the 20 mg and 40 mg capsules contain the same amount of sodium bicarbonate (1,100 mg), two capsules of 20 mg are not equivalent to one capsule of omeprazole and sodium bicarbonate 40 mg; therefore, two 20 mg capsules of omeprazole and sodium bicarbonate should not be substituted for one capsule of omeprazole and sodium bicarbonate 40 mg. Omeprazole and sodium bicarbonate capsules should be taken on an empty stomach at least one hour before a meal. Table 1: Recommended Doses of Omeprazole and Sodium Bicarbonate by Indication for Adults 18 Years and Older Indication Recommended Dose Frequency Short-Term Treatment of Active Duodenal Ulcer 20 mg Once daily for 4 weeks Most patients heal within 4 weeks. Some patients may require an additional 4 weeks of therapy. [See Clinical Studies (14.1) .] , For additional information, [See Indications and Usage (1) ] Benign Gastric Ulcer 40 mg Once daily for 4-8 weeks , Controlled studies do not extend beyond 12 months. [See Clinical Studies (14) .] Gastroesophageal Reflux Disease (GERD) Symptomatic GERD (with no esophageal erosions) 20 mg Once daily for up to 4 weeks Erosive Esophagitis 20 mg Once daily for 4-8 weeks Maintenance of Healing of Erosive Esophagitis 20 mg Once daily • Short-Term Treatment of Active Duodenal Ulcer: 20 mg once daily for 4 weeks (some patients may require an additional 4 weeks of therapy ( 14.1 )) ( 2 ) • Gastric Ulcer: 40 mg once daily for 4-8 weeks ( 2 ) • Gastroesophageal Reflux Disease (GERD) ( 2 ) o Symptomatic GERD (with no esophageal erosions): 20 mg once daily for up to 4 weeks o Erosive Esophagitis: 20 mg once daily for 4-8 weeks • Maintenance of Healing of Erosive Esophagitis: 20 mg once daily* ( 2 ) *Studied for 12 months Special Populations Hepatic Insufficiency Consider dose reduction, particularly for maintenance of healing of erosive esophagitis. [See Clinical Pharmacology (12.3) .] Administration of Capsules Omeprazole and sodium bicarbonate capsules should be swallowed intact with water. DO NOT USE OTHER LIQUIDS. DO NOT OPEN CAPSULE AND SPRINKLE CONTENTS INTO FOOD.

Omeprazole and sodium bicarbonate is contraindicated in patients with known hypersensitivity to any components of the formulation. Hypersensitivity reactions may include anaphylaxis, anaphylactic shock, angioedema, bronchospasm, acute interstitial nephritis, and urticaria. [See Adverse Reactions (6) .] • Known hypersensitivity to any components of the formulation ( 4 )

The following serious adverse reactions are described below and elsewhere in labeling: • Acute Interstitial Nephritis [see Warnings and Precautions (5.2) ] • Clostridium difficile -Associated Diarrhea [see Warnings and Precautions (5.4) ] • Bone Fracture [see Warnings and Precautions (5.5) ] • Cutaneous and Systemic Lupus Erythematosus [see Warnings and Precautions (5.6) ] • Cyanocobalamin (Vitamin B-12) Deficiency [see Warnings and Precautions (5.8) ] • Hypomagnesemia [see Warnings and Precautions (5.9) ] • Fundic Gland Polyps [see Warnings and Precautions (5.13) ] Most common adverse reactions (incidence ≥ 2%) are: headache, abdominal pain, nausea, diarrhea, vomiting, and flatulence ( 6 ) To report SUSPECTED ADVERSE REACTIONS, contact Westminster Pharmaceuticals, LLC at 1-844-221-7294 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.1 Clinical Trials Experience Because clinical trials are conducted under widely 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 clinical practice. In the U.S. clinical trial population of 465 patients, the adverse reactions summarized in Table 2 were reported to occur in 1% or more of patients on therapy with omeprazole. Numbers in parentheses indicate percentages of the adverse reactions considered by investigators as possibly, probably or definitely related to the drug. Table 2: Adverse Reactions Occurring in 1% or More of Patients on Omeprazole Therapy Omeprazole (n = 465) Placebo (n = 64) Ranitidine (n = 195) Headache 6.9 (2.4) 6.3 7.7 (2.6) Diarrhea 3.0 (1.9) 3.1 (1.6) 2.1 (0.5) Abdominal Pain 2.4 (0.4) 3.1 2.1 Nausea 2.2 (0.9) 3.1 4.1 (0.5) URI 1.9 1.6 2.6 Dizziness 1.5 (0.6) 0.0 2.6 (1.0) Vomiting 1.5 (0.4) 4.7 1.5 (0.5) Rash 1.5 (1.1) 0.0 0.0 Constipation 1.1 (0.9) 0.0 0.0 Cough 1.1 0.0 1.5 Asthenia 1.1 (0.2) 1.6 (1.6) 1.5 (1.0) Back Pain 1.1 0.0 0.5 Table 3 summarizes the adverse reactions that occurred in 1% or more of omeprazole-treated patients from international double-blind and open-label clinical trials in which 2,631 patients and subjects received omeprazole. Table 3: Incidence of Adverse Reactions ≥ 1% Causal Relationship not Assessed Omeprazole (n = 2631) Placebo (n = 120) Body as a Whole, Site Unspecified Abdominal Pain 5.2 3.3 Asthenia 1.3 0.8 Digestive System Constipation 1.5 0.8 Diarrhea 3.7 2.5 Flatulence 2.7 5 .8 Nausea 4.0 6.7 Vomiting 3.2 10.0 Acid Regurgitation 1.9 3.3 Nervous System/Psychiatric Headache 2.9 2.5 6.2 Postmarketing Experience The following adverse reactions have been identified during post-approval use of omeprazole. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. Body as a Whole: Hypersensitivity reactions, including anaphylaxis, anaphylactic shock, angioedema, bronchospasm, interstitial nephritis, urticaria (see also Error! Hyperlink reference not valid. below), fever, pain, fatigue, malaise, and systemic lupus erythematosus. Cardiovascular: Chest pain or angina, tachycardia, bradycardia, palpitation, elevated blood pressure, and peripheral edema. Gastrointestinal: Pancreatitis (some fatal), anorexia, irritable colon, flatulence, fecal discoloration, esophageal candidiasis, mucosal atrophy of the tongue, dry mouth, stomatitis, abdominal swelling and fundic gland polyps. Gastroduodenal carcinoids have been reported in patients with Zollinger-Ellison syndrome on long-term treatment with omeprazole. This finding is believed to be a manifestation of the underlying condition, which is known to be associated with such tumors. Hepatic: Mild and, rarely, marked elevations of liver function tests [ALT (SGPT), AST (SGOT), γ-glutamyltranspeptidase, alkaline phosphatase, and bilirubin (jaundice)]. In rare instances, overt liver disease has occurred, including hepatocellular, cholestatic, or mixed hepatitis, liver necrosis (some fatal), hepatic failure (some fatal), and hepatic encephalopathy. Infections and Infestations: Clostridium difficile- associated diarrhea. Metabolism and Nutritional Disorders: Hyponatremia, hypoglycemia, hypomagnesemia, and weight gain. Musculoskeletal: Muscle cramps, myalgia, muscle weakness, joint pain, bone fracture, and leg pain. Nervous System/Psychiatric: Psychic disturbances including depression, agitation, aggression, hallucinations, confusion, insomnia, nervousness, tremors, apathy, somnolence, anxiety, dream abnormalities; vertigo; paresthesia; and hemifacial dysesthesia. Respiratory: Epistaxis, pharyngeal pain. Skin: Severe generalized skin reactions including toxic epidermal necrolysis (TEN; some fatal), Stevens-Johnson syndrome, cutaneous lupus erythematosus and erythema multiforme (some severe); purpura and/or petechiae (some with rechallenge); skin inflammation, urticaria, angioedema, pruritus, photosensitivity, alopecia, dry skin, and hyperhidrosis. Special Senses: Tinnitus, taste perversion. Ocular: Blurred vision, ocular irritation, dry eye syndrome, optic atrophy, anterior ischemic optic neuropathy, optic neuritis and double vision. Urogenital: Interstitial nephritis (some with positive rechallenge), urinary tract infection, microscopic pyuria, urinary frequency, elevated serum creatinine, proteinuria, hematuria, glycosuria, testicular pain, and gynecomastia. Hematologic: Rare instances of pancytopenia, agranulocytosis (some fatal), thrombocytopenia, neutropenia, leukopenia, anemia, leukocytosis, and hemolytic anemia have been reported. The incidence of clinical adverse experiences in patients greater than 65 years of age was similar to that in patients 65 years of age or less. Additional adverse reactions that could be caused by sodium bicarbonate include metabolic alkalosis, seizures, and tetany.

• May interfere with drugs for which gastric pH can affect bioavailability (e.g., ketoconazole, ampicillin esters, iron salts, erlotinib, digoxin, and mycophenolate mofetil). ( 7.1 ) • Drugs metabolized by cytochrome P450 (e.g., diazepam, warfarin, phenytoin, cyclosporine, disulfiram, benzodiazepines): Omeprazole and sodium bicarbonate can prolong their elimination. Monitor to determine the need for possible dose adjustments when taken with omeprazole and sodium bicarbonate. ( 7.2 ) • Patients treated with proton pump inhibitors and warfarin concomitantly may need to be monitored for increases in INR and prothrombin time. ( 7.2 ) • Voriconazole: May increase plasma levels of omeprazole. ( 7.2 ) • Saquinavir: Omeprazole and sodium bicarbonate increases plasma levels of saquinavir. ( 7.3 ) • Omeprazole and sodium bicarbonate may reduce plasma levels of atazanavir and nelfinavir. ( 7.3 ) • Clopidogrel: Omeprazole and sodium bicarbonate decreases exposure to the active metabolite of clopidogrel. ( 7.5 ) • Tacrolimus: Omeprazole and sodium bicarbonate may increase serum levels of tacrolimus. ( 7.6 ) 7.1 Drugs for Which Gastric pH Can Affect Bioavailability Due to its effects on gastric acid secretion, omeprazole can reduce the absorption of drugs where gastric pH is an important determinant of their bioavailability. Like with other drugs that decrease the intragastric acidity, the absorption of drugs such as ketoconazole, atazanavir, iron salts, erlotinib, and mycophenolate mofetil (MMF) can decrease, while the absorption of drugs such as digoxin can increase during treatment with omeprazole. Concomitant treatment with omeprazole (20 mg daily) and digoxin in healthy subjects increased the bioavailability of digoxin by 10% (30% in two subjects). Coadministration of digoxin with omeprazole and sodium bicarbonate is expected to increase the systemic exposure of digoxin. Therefore, patients may need to be monitored when digoxin is taken concomitantly with omeprazole and sodium bicarbonate. Co-administration of omeprazole in healthy subjects and in transplant patients receiving MMF has been reported to reduce the exposure to the active metabolite, mycophenolic acid (MPA), possibly due to a decrease in MMF solubility at an increased gastric pH. The clinical relevance of reduced MPA exposure on organ rejection has not been established in transplant patients receiving omeprazole and sodium bicarbonate and MMF. Use omeprazole with caution in transplant patients receiving MMF. [ See Clinical Pharmacology (12.3) . ] 7.2 Drugs Metabolized by Cytochrome P450 (CYP) Omeprazole can prolong the elimination of diazepam, warfarin and phenytoin, drugs that are metabolized by oxidation in the liver. There have been reports of increased international normalized ratio (INR) and prothrombin time in patients receiving proton pump inhibitors, including omeprazole, and warfarin concomitantly. Increases in INR and prothrombin time may lead to abnormal bleeding and even death. Patients treated with proton pump inhibitors and warfarin may need to be monitored for increases in INR and prothrombin time. Although in normal subjects no interaction with theophylline or propranolol was found, there have been clinical reports of interaction with other drugs metabolized via the cytochrome P450 system (e.g., cyclosporine, disulfiram, benzodiazepines). Patients should be monitored to determine if it is necessary to adjust the dosage of these drugs when taken concomitantly with omeprazole and sodium bicarbonate. Concomitant administration of omeprazole and voriconazole (a combined inhibitor of CYP2C19 and CYP3A4) resulted in more than doubling of the omeprazole exposure. Dose adjustment of omeprazole is not normally required. When voriconazole (400 mg every 12 hours for one day, then 200 mg for 6 days) was given with omeprazole (40 mg once daily for 7 days) to healthy subjects, it significantly increased the steady-state C max and AUC 0-24 of omeprazole, an average of 2 times (90% CI: 1.8, 2.6) and 4 times (90% CI: 3.3, 4.4) respectively as compared to when omeprazole was given without voriconazole. Drugs known to induce CYP2C19 or CYP3A4 (such as rifampin) may lead to decreased omeprazole serum levels. In a crossover study in 12 healthy male subjects, St. John's wort (300 mg three times daily for 14 days), an inducer of CYP3A4, decreased the systemic exposure of omeprazole in CYP2C19 poor metabolizers (C max and AUC decreased by 37.5% and 37.9%, respectively) and extensive metabolizers (C max and AUC decreased by 49.6% and 43.9%, respectively). Avoid concomitant use of St. John's Wort or rifampin with omeprazole. 7.3 Antiretroviral Agents Concomitant administration of atazanavir and proton pump inhibitors is not recommended. Co-administration of atazanavir with proton pump inhibitors is expected to substantially decrease atazanavir plasma concentrations and thereby reduce its therapeutic effect. Omeprazole has been reported to interact with some antiretroviral drugs. The clinical importance and the mechanisms behind these interactions are not always known. Increased gastric pH during omeprazole treatment may change the absorption of the antiretroviral drug. Other possible interaction mechanisms are via CYP2C19. For some antiretroviral drugs, such as atazanavir and nelfinavir, decreased serum levels have been reported when given together with omeprazole. Following multiple doses of nelfinavir (1250 mg, twice daily) and omeprazole (40 mg, daily), AUC was decreased by 36% and 92%, C max by 37% and 89% and C min by 39% and 75% respectively for nelfinavir and M8. Following multiple doses of atazanavir (400 mg, daily) and omeprazole (40 mg, daily, 2 hours before atazanavir), AUC was decreased by 94%, C max by 96%, and C min by 95%. Concomitant administration with omeprazole and drugs such as atazanavir and nelfinavir is therefore not recommended. Increased Concentration of Saquinavir For other antiretroviral drugs, such as saquinavir, elevated serum levels have been reported with an increase in AUC by 82%, in C max by 75% and in C min by 106% following multiple dosing of saquinavir/ritonavir (1000/100 mg) twice daily for 15 days with omeprazole 40 mg daily co-administered days 11 to 15. Dose reduction of saquinavir should be considered from the safety perspective for individual patients. There are also some antiretroviral drugs of which unchanged serum levels have been reported when given with omeprazole. 7.4 Combination Therapy with Clarithromycin Concomitant administration of clarithromycin with other drugs can lead to serious adverse reactions due to drug interaction [ See Warnings and Precautions in prescribing information for clarithromycin]. Because of these drug interactions, clarithromycin is contraindicated for co-administration with certain drugs [ See Contraindications in prescribing information for clarithromycin.] 7.5 Clopidogrel Omeprazole is an inhibitor of CYP2C19 enzyme. Clopidogrel is metabolized to its active metabolite in part by CYP2C19. Concomitant use of omeprazole 80 mg results in reduced plasma concentrations of the active metabolite of clopidogrel and a reduction in platelet inhibition. Avoid concomitant administration of omeprazole and sodium bicarbonate with clopidogrel. When using omeprazole and sodium bicarbonate, consider use of alternative anti-platelet therapy. [ See Clinical Pharmacology (12.3.) ] 7.6 Tacrolimus Concomitant administration of omeprazole and tacrolimus may increase the serum levels of tacrolimus. 7.7 Interactions with Investigations of Neuroendocrine Tumors Drug-induced decrease in gastric acidity results in enterochromaffin-like cell hyperplasia and increased Chromogranin A levels which may interfere with investigations for neuroendocrine tumors. [ See Clinical Pharmacology (12) . ] 7.8 Methotrexate Case reports, published population pharmacokinetic studies, and retrospective analyses suggest that concomitant administration of PPIs and methotrexate (primarily at high dose; see methotrexate prescribing information) may elevate and prolong serum levels of methotrexate and/or its metabolite hydroxymethotrexate. However, no formal drug interaction studies of methotrexate with PPIs have been conducted. [See Warnings and Precautions (5.12) .]

Storage Store at 25°C (77°F); excursions permitted to 15°C to 30°C (59°F to 86°F) [see USP Controlled Room Temperature]. Keep container tightly closed. Protect from light and moisture.