esomeprazole 20 MG Delayed Release Oral Tablet

INDICATIONS AND USAGE Esomeprazole magnesium for delayed-release oral suspension is a proton pump inhibitor (PPI). Esomeprazole magnesium for delayed-release oral suspension are indicated for the: Short-term treatment in the healing of erosive esophagitis (EE) in adults and pediatric patients 12 years to 17 years of age. ( 1.1 ) Maintenance of healing of EE in adults. ( 1.2 ) Short-term treatment of heartburn and other symptoms associated GERD in adults and pediatric patients 12 years to 17 years of age. ( 1.3 ) Risk reduction of nonsteroidal anti-inflammatory drugs (NSAID)-associated gastric ulcer in adults at risk for developing gastric ulcers due to age (60 years and older) and/or documented history of gastric ulcers. ( 1.4 ) Helicobacter pylori eradication in adult patients to reduce the risk of duodenal ulcer recurrence in combination with amoxicillin and clarithromycin. ( 1.5 ) Long-term treatment of pathological hypersecretory conditions, including Zollinger-Ellison syndrome in adults. ( 1.6 ) Esomeprazole magnesium for delayed-release oral suspension is indicated for the: Short-term treatment in the healing of EE in pediatric patients 1 year to 11 years of age and of EE due to acid-mediated GERD in pediatric patients 1 month to less than 1 year of age. ( 1.1 ) Short-term treatment of heartburn and other symptoms associated with GERD in pediatric patients 1 year to 11 years of age. ( 1.3 ) 1.1 Healing of Erosive Esophagitis (EE) Adults Esomeprazole magnesium for delayed-release oral suspension is indicated for the short-term treatment (4 to 8 weeks) in the healing and symptomatic resolution of diagnostically confirmed EE in adults. For those patients who have not healed after 4 to 8 weeks of treatment, an additional 4 to 8 week course of esomeprazole magnesium for delayed-release oral suspension may be considered. Pediatric Patients 12 Years to 17 Years of Age Esomeprazole magnesium for delayed-release oral suspension is indicated for the short-term treatment (4 to 8 weeks) for the healing of EE in pediatric patients 12 years to 17 years of age. Pediatric Patients 1 Year to 11 Years of Age Esomeprazole magnesium for delayed-release oral suspension is indicated for the short-term treatment (8 weeks) for the healing of EE in pediatric patients 1 year to 11 years of age. Pediatric Patients 1 Month to Less Than 1 Year of Age Esomeprazole magnesium for delayed-release oral suspension is indicated for short-term treatment (up to 6 weeks) of EE due to acid-mediated GERD in pediatric patients 1 month to less than 1 year of age. 1.2 Maintenance of Healing of EE Esomeprazole magnesium for delayed-release oral suspension is indicated for the maintenance of healing of EE in adults. Controlled studies do not extend beyond 6 months. 1.3 Treatment of Symptomatic GERD Adults Esomeprazole magnesium for delayed-release oral suspension is indicated for short-term treatment (4 to 8 weeks) of heartburn and other symptoms associated with GERD in adults. Pediatric Patients 12 Years to 17 Years of Age Esomeprazole magnesium for delayed-release oral suspension is indicated for short-term treatment (4 weeks) of heartburn and other symptoms associated with GERD in pediatric patients 12 years to 17 years of age. Pediatric Patients 1 Year to 11 Years of Age Esomeprazole magnesium for delayed-release oral suspension is indicated for short-term treatment (up to 8 weeks) of heartburn and other symptoms associated with GERD in pediatric patients 1 year to 11 years of age. 1.4 Risk Reduction of Nonsteroidal Anti-Inflammatory Drugs (NSAID)-Associated Gastric Ulcer Esomeprazole magnesium for delayed-release oral suspension is indicated for the reduction in the occurrence of gastric ulcers associated with continuous NSAID therapy in adult patients at risk for developing gastric ulcers. Patients are considered to be at risk due to their age (60 years and older) and/or documented history of gastric ulcers. Controlled studies do not extend beyond 6 months. 1.5 Helicobacter pylori Eradication to Reduce the Risk of Duodenal Ulcer Recurrence Eradication of H. pylori has been shown to reduce the risk of duodenal ulcer recurrence. Triple Therapy Esomeprazole magnesium for delayed-release oral suspension in combination with amoxicillin and clarithromycin is indicated for the treatment of adult patients with H. pylori infection and duodenal ulcer disease (active or history of within the past 5 years) to eradicate H. pylori . In patients who fail therapy, susceptibility testing should be done. If resistance to clarithromycin is demonstrated or susceptibility testing is not possible, alternative antimicrobial therapy should be instituted [see Clinical Pharmacology ( 12.4 ) and the prescribing information for clarithromycin] . 1.6 Pathological Hypersecretory Conditions Including Zollinger-Ellison Syndrome Esomeprazole magnesium for delayed-release oral suspension is indicated for the long-term treatment of pathological hypersecretory conditions, including Zollinger-Ellison Syndrome, in adults.

DOSAGE AND ADMINISTRATION GERD with Erosive Esophagitis ( 2.1 ): • The recommended adult dosage is either 20 mg or 40 mg once daily by intravenous injection (no less than 3 minutes) or intravenous infusion (10 minutes to 30 minutes) for up to 10 days. • The recommended pediatric dosage is based upon age and weight. See full prescribing information. Risk Reduction of Rebleeding of Gastric and Duodenal Ulcers ( 2.2 ) : • The recommended adult dosage is 80 mg administered as an intravenous infusion over 30 minutes, followed by a continuous infusion of 8 mg/hour for a total treatment duration of 72 hours. Dosage Adjustment for Hepatic Impairment ( 2.3 ) : • See full prescribing information for dosage adjustment by severity of impairment and by indication. Preparation and Administration ( 2.4 , 2.5 ) : • See full prescribing information for preparation and administration instructions by indication. 2.1 Dosage for GERD with EE Adult Patients The recommended adult dosage is either 20 mg or 40 mg esomeprazole sodium for injection given once daily by intravenous injection (over at least 3 minutes) or intravenous infusion (10 minutes to 30 minutes) for up to 10 days [see Dosage and Administration (2.4) ]. Pediatric Patients The recommended dosage for pediatric patients is based on age and body weight as shown in Table 1 below. Administer as an intravenous infusion over 10 to 30 minutes once daily for up to 10 days [ see Dosage and Administration (2.4) ]. Table 1: Recommended Pediatric Dosage Regimen for GERD with EE Age and Body Weight Dosage Regimen 1 month to less than 1 year of age 0.5 mg/kg once daily 1 year to 17 years less than 55 kg 10 mg once daily 55 kg or greater 20 mg once daily Completion of Treatment • The safety and effectiveness of esomeprazole sodium for injection for more than 10 days have not been demonstrated. • As soon as oral therapy is possible or appropriate, discontinue intravenous therapy with esomeprazole sodium for injection and continue with oral esomeprazole therapy. 2.2 Dosage for Risk Reduction of Rebleeding of Gastric or Duodenal Ulcers following Therapeutic Endoscopy in Adults The recommended adult dosage is 80 mg esomeprazole sodium administered as an intravenous infusion over 30 minutes followed by a continuous infusion of 8 mg/hour for a total treatment duration of 72 hours (i.e., includes initial 30-minute loading dose plus 71.5 hours of continuous infusion) [see Dosage and Administration (2.5) ]. Intravenous therapy is aimed solely at the acute initial management of bleeding gastric or duodenal ulcers and does not constitute full treatment. Administer oral acid-suppressive therapy following intravenous therapy for a full course of treatment. 2.3 Dosage Adjustment for Hepatic Impairment GERD with EE For patients with severe hepatic impairment (Child-Pugh Class C), the maximum dosage is 20 mg once daily [see Use in Specific Populations (8.6) ]. Risk Reduction of Rebleeding of Gastric or Duodenal Ulcers following Therapeutic Endoscopy in Adults For patients with mild to moderate hepatic impairment (Child-Pugh Classes A and B, respectively), administered 80 mg as an intravenous infusion over 30 minutes, followed by a continuous infusion of 6 mg/hour for 71.5 hours. For patients with severe hepatic impairment (Child-Pugh Class C), administered 80 mg as an intravenous infusion over 30 minutes, followed by a continuous infusion of 4 mg/hour for 71.5 hours [see Use in Specific Populations (8.6) ]. 2.4 Preparation and Administration Instructions for GERD with EE Do not administer esomeprazole sodium for injection concomitantly with any other medications through the same intravenous site and/or tubing. Oral antacids may be used during treatment with esomeprazole sodium for injection. I ntravenous Injection Over At Least 3 Minutes in Adult Patients 1. Reconstitute esomeprazole sodium for injection with 5 mL of 0.9% Sodium Chloride Injection, USP. 2. Withdraw the desired dose of the reconstituted esomeprazole sodium solution for a 20 mg or 40 mg dose. 3. Discard any unused portion of esomeprazole sodium for injection solution remaining in the vial. 4. Inspect the reconstituted esomeprazole sodium for injection solution visually for particulate matter and discoloration prior to and during administration. 5. Administer as an intravenous injection over no less than 3 minutes. 6. Flush the intravenous line with either 0.9% Sodium Chloride Injection, USP, Lactated Ringer’s Injection, USP or 5% Dextrose Injection, USP both prior to and after administration of esomeprazole sodium for injection. Intravenous Infusion Over 10 Minutes to 30 Minutes in Adult and Pediatric Patients 1. Reconstitute the contents of one vial of esomeprazole sodium for injection with 5 mL of 0.9% Sodium Chloride Injection, USP, Lactated Ringer’s Injection, USP or 5% Dextrose Injection, USP. 2. Further dilute the resulting solution with 45 mL of 0.9% Sodium Chloride Injection, USP, Lactated Ringer’s Injection, USP or 5% Dextrose Injection, USP to a final concentration of 0.8 mg/mL. 3. Withdraw the desired dose of the reconstituted esomeprazole sodium for injection solution for an adult or pediatric dose. 4. Discard any unused portion of esomeprazole sodium for injection solution remaining in the vial. 5. Inspect the reconstituted esomeprazole sodium for injection solution visually for particulate matter and discoloration prior to and during administration. 6. Administer intravenously over 10 minutes to 30 minutes. 7. Flush the intravenous line with either 0.9% Sodium Chloride Injection, USP, Lactated Ringer’s Injection, USP or 5% Dextrose Injection, USP both prior to and after administration of esomeprazole sodium for injection. Storage Store the final (diluted) esomeprazole sodium for injection solution at room temperature up to 30°C (86°F) and administer within the designated time period as listed in Table 2 below. Table 2: Storage Time for Final (diluted) Esomeprazole Sodium for Injection Solution Diluent Administer within: 0.9% Sodium Chloride Injection, USP 12 hours Lactated Ringer’s Injection, USP 12 hours 5% Dextrose Injection, USP 6 hours 2.5 Preparation and Administration Instructions for Risk Reduction of Rebleeding of Gastric or Duodenal Ulcers in Adults Do not administer esomeprazole sodium for injection concomitantly with any other medications through the same intravenous site and/or tubing. Oral antacids may be used during treatment with esomeprazole sodium for injection. Loading Dose (80 mg) 1. Reconstitute each of two 40 mg vials of esomeprazole sodium for injection with 5 mL of 0.9% Sodium Chloride Injection, USP. 2. Further dilute the resulting solution in 100 mL 0.9% Sodium Chloride Injection, USP. 3. Inspect the reconstituted esomeprazole sodium for injection solution visually for particulate matter and discoloration prior to and during administration. 4. Administer intravenously over 30 minutes. 5. Flush the intravenous line with either 0.9% Sodium Chloride Injection, USP, Lactated Ringer’s Injection, USP or 5% Dextrose Injection, USP both prior to and after administration of esomeprazole sodium for injection. Continuous Infusion 1. Reconstitute each of two 40 mg vials of esomeprazole sodium for injection with 5 mL of 0.9% Sodium Chloride Injection, USP. 2. Further dilute the reconstituted esomeprazole sodium for injection solution in 100 mL 0.9% Sodium Chloride Injection, USP. 3. Inspect the reconstituted esomeprazole sodium for injection solution visually for particulate matter and discoloration prior to and during administration. 4. Administer intravenously as a continuous infusion at a rate of 8 mg/hour for 71.5 hours. 5. Flush the intravenous line with either 0.9% Sodium Chloride Injection, USP, Lactated Ringer’s Injection, USP or 5% Dextrose Injection, USP both prior to and after administration of esomeprazole sodium for injection. Storage • Store the final (diluted) esomeprazole sodium for injection solution at room temperature up to 30°C

WARNINGS AND PRECAUTIONS Gastric Malignancy : In adults, symptomatic response does not preclude the presence of gastric malignancy. Consider additional follow-up and diagnostic testing. ( 5.1 ) Acute Tubulointerstitial Nephritis : Discontinue treatment and evaluate patients. ( 5.2 ) Clostridium difficile- Associated Diarrhea : PPI therapy may be associated with increased risk. ( 5.3 ) Bone Fracture : Long-term and multiple daily dose PPI therapy may be associated with an increased risk for osteoporosis-related fractures of the hip, wrist or spine. ( 5.4 ) Severe Cutaneous Adverse Reactions : Discontinue at the first signs or symptoms of severe cutaneous adverse reactions or other signs of hypersensitivity and consider further evaluation. ( 5.5 ) Cutaneous and Systemic Lupus Erythematosus : Mostly cutaneous; new onset or exacerbation of existing disease; discontinue esomeprazole magnesium delayed-release capsules and refer to specialist for evaluation. ( 5.6 ) Interaction with Clopidogrel : Avoid concomitant use of esomeprazole magnesium delayed-release capsules. ( 5.7 ) Cyanocobalamin (Vitamin B-12) Deficiency : Daily long-term use (e.g., longer than 3 years) may lead to malabsorption or a deficiency of cyanocobalamin. ( 5.8 ) Hypomagnesemia and Mineral Metabolism : Reported rarely with prolonged treatment with PPIs. ( 5.9 ) Interaction with St. John’s Wort or Rifampin : Avoid concomitant use of esomeprazole magnesium delayed-release capsules. ( 5.10 , 7 ) Interactions with Diagnostic Investigations for Neuroendocrine Tumors : Increased chromogranin A (CgA) levels may interfere with diagnostic investigations for neuroendocrine tumors, temporarily stop esomeprazole magnesium delayed-release capsules at least 14 days before assessing CgA levels. ( 5.11 , 12.2 ) Interaction with Methotrexate : Concomitant use with PPIs may elevate and/or prolong serum concentrations of methotrexate and/or its metabolite, possibly leading to toxicity. With high dose methotrexate administration, consider temporary withdrawal of esomeprazole magnesium delayed-release capsules. ( 5.12 , 7 ) Fundic Gland Polyps: Risk increases with long-term use, especially beyond one year. Use the shortest duration of therapy. ( 5.13 ) 5.1 Presence of Gastric Malignancy In adults, symptomatic response to therapy with esomeprazole magnesium delayed-release capsules do not preclude the presence of gastric malignancy. Consider additional follow-up and diagnostic testing in adult patients who have a suboptimal response or an early symptomatic relapse after completing treatment with a PPI. In older patients, also consider an endoscopy. 5.2 Acute Tubulointerstitial Nephritis Acute tubulointerstitial nephritis (TIN) has been observed in patients taking PPIs and may occur at any point during PPI therapy. Patients may present with varying signs and symptoms from symptomatic hypersensitivity reactions to non-specific symptoms of decreased renal function (e.g., malaise, nausea, anorexia). In reported case series, some patients were diagnosed on biopsy and in the absence of extra-renal manifestations (e.g., fever, rash or arthralgia). Discontinue esomeprazole magnesium delayed-release capsules and evaluate patients with suspected acute TIN [see Contraindications (4) ] . 5.3 Clostridium difficile- Associated Diarrhea Published observational studies suggest that PPI therapy like esomeprazole magnesium delayed-release capsules may be associated with an increased risk of Clostridium difficile- associated diarrhea, especially in hospitalized patients. This diagnosis should be considered for diarrhea that does not improve [see Adverse Reactions (6.2) ]. Patients should use the lowest dose and shortest duration of PPI therapy appropriate to the condition being treated. Clostridium difficile- associated diarrhea (CDAD) has been reported with use of nearly all antibacterial agents. For more information specific to antibacterial agents (clarithromycin and amoxicillin) indicated for use in combination with esomeprazole magnesium delayed-release capsules, refer to Warnings and Precautions section of the corresponding prescribing information. 5.4 Bone Fracture Several published observational studies suggest that proton pump inhibitor (PPI) therapy may be associated with an increased risk for osteoporosis-related fractures of the hip, wrist, or spine. The risk of fracture was increased in patients who received high-dose, defined as multiple daily doses, and long-term PPI therapy (a year or longer). Patients should use the lowest dose and shortest duration of PPI therapy appropriate to the condition being treated. Patients at risk for osteoporosis-related fractures should be managed according to established treatment guidelines [see Dosage and Administration (2) and Adverse Reactions (6.2) ]. 5.5 Severe Cutaneous Adverse Reactions Severe cutaneous adverse reactions, including Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN), drug reaction with eosinophilia and systemic symptoms (DRESS), and acute generalized exanthematous pustulosis (AGEP) have been reported in association with the use of PPIs [see Adverse Reactions (6.2) ] . Discontinue esomeprazole magnesium delayed-release capsules at the first signs or symptoms of severe cutaneous adverse reactions or other signs of hypersensitivity and consider further evaluation. 5.6 Cutaneous and Systemic Lupus Erythematosus Cutaneous lupus erythematosus (CLE) and systemic lupus erythematosus (SLE) have been reported in patients taking PPIs, including esomeprazole. These events have occurred as both new onset and an exacerbation of existing autoimmune disease. The majority of PPI-induced lupus erythematosus cases were CLE. The most common form of CLE reported in patients treated with PPIs was subacute CLE (SCLE) and occurred within weeks to years after continuous drug therapy in patients ranging from infants to the elderly. Generally, histological findings were observed without organ involvement. Systemic lupus erythematosus (SLE) is less commonly reported than CLE in patients receiving PPIs. PPI associated SLE is usually milder than non-drug induced SLE. Onset of SLE typically occurred within days to years after initiating treatment primarily in patients ranging from young adults to the elderly. The majority of patients presented with rash; however, arthralgia and cytopenia were also reported. Avoid administration of PPIs for longer than medically indicated. If signs or symptoms consistent with CLE or SLE are noted in patients receiving esomeprazole magnesium delayed-release capsules, discontinue the drug and refer the patient to the appropriate specialist for evaluation. Most patients improve with discontinuation of the PPI alone in 4 to 12 weeks. Serological testing (e.g., ANA) may be positive and elevated serological test results may take longer to resolve than clinical manifestations. 5.7 Interaction with Clopidogrel Avoid concomitant use of esomeprazole magnesium delayed-release capsules with clopidogrel. Clopidogrel is a prodrug. Inhibition of platelet aggregation by clopidogrel is entirely due to an active metabolite. The metabolism of clopidogrel to its active metabolite can be impaired by use with concomitant medications, such as esomeprazole, that inhibit CYP2C19 activity. Concomitant use of clopidogrel with 40 mg esomeprazole reduces the pharmacological activity of clopidogrel. When using esomeprazole magnesium delayed-release capsules consider alternative anti-platelet therapy [see Drug Interactions (7) ]. 5.8 Cyanocobalamin (Vitamin B-12) Deficiency Daily treatment with any acid-suppressing medications over a long period of time (e.g., longer than 3 years) may lead to malabsorption of cyanocobalamin (vitamin B-12) caused by hypo- or achlorhydria. Rare reports of cyanocobalamin deficiency occurring with acid-suppressing therapy have been reported in the literature. This diagnosis should be considered if clinical symptoms consistent with cyanoc

CONTRAINDICATIONS • Esomeprazole magnesium delayed-release capsules are contraindicated in patients with known hypersensitivity to substituted benzimidazoles or to any component of the formulation. Hypersensitivity reactions may include anaphylaxis, anaphylactic shock, angioedema, bronchospasm, acute tubulointerstitial nephritis, and urticaria [see Warnings and Precautions ( 5.2 ), Adverse Reactions ( 6.2 )] . • For information about contraindications of amoxicillin and clarithromycin, indicated in combination with esomeprazole magnesium delayed-release capsules for H. pylori eradication to reduce the risk of duodenal ulcer recurrence, refer to the Contraindications section of the respective prescribing information. • Proton pump inhibitors (PPIs), including esomeprazole magnesium delayed-release capsules, are contraindicated in patients receiving rilpivirine-containing products [see Drug Interactions ( 7 )]. • Known hypersensitivity to substituted benzimidazoles or any component of the formulation. ( 4 ) • Patients receiving rilpivirine-containing products. ( 4 , 7 ) • Refer to the Contraindications section of the prescribing information for amoxicillin and clarithromycin, when administered in combination with esomeprazole magnesium delayed-release capsules. ( 4 )

CLINICAL PHARMACOLOGY 12.1 Mechanism of Action Esomeprazole belongs to a class of antisecretory compounds, the substituted benzimidazoles, that suppress gastric acid secretion by specific inhibition of the H+/K+ ATPase enzyme system at the secretory surface of the gastric parietal cell. Esomeprazole is protonated and converted in the acidic compartment of the parietal cell forming the active inhibitor, the achiral sulphenamide. Because this enzyme system is regarded as the acid (proton) pump within the gastric mucosa, esomeprazole has been characterized as a gastric acid-pump inhibitor, in that it blocks the final step of acid production. This effect is dose-related and leads to inhibition of both basal and stimulated acid secretion irrespective of the stimulus. 12.2 Pharmacodynamics Antisecretory Activity Adults The effect of esomeprazole magnesium delayed-release capsules on intragastric pH was determined in adult patients with symptomatic GERD in two separate studies. In the first study of 36 patients, esomeprazole magnesium delayed-release capsules 40 mg and 20 mg capsules were administered once daily over 5 days as shown in Table 5: Table 5: Effect of Esomeprazole on Intragastric pH on Day 5 (N=36) Following Once Daily Dosing of Esomeprazole magnesium Delayed-Release Capsules in Adult Patients with Symptomatic GERD 1 Gastric pH was measured over a 24-hour period 2 p< 0.01 Esomeprazole magnesium delayed-release capsules 40 mg vs. esomeprazole magnesium delayed-release capsules 20 mg Parameter Esomeprazole magnesium delayed-release capsules 40 mg once daily 20 mg once daily % Time Gastric pH >4 1 (Hours) 70% 2 (16.8 h) 53% (12.7 h) Coefficient of variation 26% 37% Median 24 Hour pH 4.9 2 4.1 Coefficient of variation 16% 27% In a second study, the effect on intragastric pH of esomeprazole magnesium delayed-release capsules 40 mg administered once daily over a five-day period was similar to the first study, (% time with pH > 4 was 68% or 16.3 hours). Serum Gastrin Effects The effect of esomeprazole magnesium delayed-release capsules on serum gastrin concentrations was evaluated in approximately 2,700 patients in clinical trials of oral esomeprazole for up to 8 weeks and in over 1,300 patients for up 12 months. The mean fasting gastrin level increased in a dose-related manner. This increase in serum gastrin concentrations reached a plateau within two to three months of therapy and returned to baseline levels within four weeks after discontinuation of therapy. Increased gastrin causes enterochromaffin-like cell hyperplasia and increased serum Chromogranin A (CgA) levels. The increased CgA levels may cause false positive results in diagnostic investigations for neuroendocrine tumors [see Warnings and Precautions ( 5.11 )] Enterochromaffin-like (ECL) Cell Effects Human gastric biopsy specimens have been obtained from more than 3,000 patients (both pediatrics and adults) treated with omeprazole in long-term clinical trials. The incidence of ECL cell hyperplasia in these studies increased with time; however, no case of ECL cell carcinoids, dysplasia, or neoplasia has been found in these patients [see Nonclinical Toxicology ( 13.1 )]. In over 1,000 patients treated with oral esomeprazole (10 mg, 20 mg or 40 mg/day) up to 12 months, the prevalence of ECL cell hyperplasia increased with time and dose. No patient developed ECL cell carcinoids, dysplasia, or neoplasia in the gastric mucosa. Endocrine Effects Esomeprazole had no effect on thyroid function in adults when given esomeprazole magnesium delayed-release capsules 20 mg or 40 mg once daily for 4 weeks. Other effects of esomeprazole on the endocrine system were assessed in studies of omeprazole. Oral doses of omeprazole 30 mg or 40 mg once daily for 2 to 4 weeks had no effect on carbohydrate metabolism, circulating levels of parathyroid hormone, cortisol, estradiol, testosterone, prolactin, cholecystokinin, or secretin. 12.3 Pharmacokinetics Absorption Esomeprazole magnesium delayed-release capsules showed similar bioavailability after a single dose (40 mg) administration in 94 healthy male and female subjects under fasting conditions. After oral administration, peak plasma levels (C max ) of esomeprazole occur at approximately 1.5 hours (T max ). The C max increases proportionally when the dose is increased, and there is a three-fold increase in the area under the plasma concentration-time curve (AUC) from 20 mg to 40 mg. At repeated once-daily dosing with 40 mg, the systemic bioavailability is approximately 90% compared to 64% after a single dose of 40 mg. The mean exposure (AUC) to esomeprazole increases from 4.32 μmol*hr/L on Day 1 to 11.2 μmol*hr/L on Day 5 after 40 mg once daily dosing. The AUC after administration of a single 40 mg dose of esomeprazole magnesium delayed-release capsules are decreased by 43% to 53% after food intake compared to fasting conditions [see Dosage and Administration ( 2.3 )]. The pharmacokinetics profile of esomeprazole in adult patients with symptomatic GERD following repeated once daily administration of 20 mg and 40 mg esomeprazole magnesium delayed-release capsules over a period of five days are shown in Table 6: Table 6: Geometric Mean (95% CI) Pharmacokinetic Parameters of Esomeprazole on Day 5 Following Once Daily Dosing of Esomeprazole magnesium Delayed-Release Capsules in Adult Patients with Symptomatic GERD 1 Values represent the geometric mean, except the T max , which is the arithmetic mean; CV = Coefficient of variation Esomeprazole magnesium delayed-release capsules Parameter 1 (CV) 40 mg once daily (n=36) 20 mg once daily (n=36) AUC (μmol·h/L) 12.6 (42%) 4.2 (59%) C max (μmol/L) 4.7 (37%) 2.1 (45%) T max (h) 1.6 1.6 t 1/2 (h) 1.5 1.2 Esomeprazole is a time-dependent inhibitor of CYP2C19, resulting in autoinhibition and nonlinear pharmacokinetics. The systemic exposure increases in a more than dose proportional manner after multiple oral doses of esomeprazole. Compared to the first dose, the systemic exposure (C max and AUC 0-24h ) at steady state following once a day dosing increased by 43% and 90%, respectively, compared to after the first dose for the 20 mg dose and increased by 95% and 159%, respectively, for the 40 mg dose. Distribution Esomeprazole is 97% bound to plasma proteins. Plasma protein binding is constant over the concentration range of 2 to 20 μmol/L. The apparent volume of distribution at steady state in healthy subjects is approximately 16 L. Elimination Metabolism Esomeprazole is extensively metabolized in the liver by the cytochrome P450 (CYP) enzyme system. The metabolites of esomeprazole lack antisecretory activity. The major part of esomeprazole's metabolism is dependent upon the CYP2C19 isoenzyme, which forms the hydroxy and desmethyl metabolites. The remaining amount is dependent on CYP3A4 which forms the sulphone metabolite. Excretion The plasma elimination half-life of esomeprazole is approximately 1 to 1.5 hours. Less than 1% of parent drug is excreted in the urine. Approximately 80% of an oral dose of esomeprazole is excreted as inactive metabolites in the urine, and the remainder is found as inactive metabolites in the feces. Combination Therapy with Amoxicillin and Clarithromycin Esomeprazole magnesium delayed-release capsules 40 mg once daily was given in combination with amoxicillin 1,000 mg twice daily and clarithromycin 500 mg twice daily for 7 days to 17 healthy male and female subjects. The mean steady state AUC and C max of esomeprazole increased by 70% and 18%, respectively during combination therapy compared to treatment with esomeprazole alone. The observed increase in esomeprazole exposure during co-administration with amoxicillin and clarithromycin is not expected to be clinically relevant. The pharmacokinetic parameters for amoxicillin and clarithromycin were similar during combination therapy and administration of each drug alone. However, the mean AUC and C max for 14-hydroxyclarithromycin increased by 19% a