Esomeprazole Magnesium Delayed Release Capsules

1 INDICATIONS AND USAGE Esomeprazole magnesium is a proton pump inhibitor (PPI). Esomeprazole magnesium delayed-release capsules 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 ) 1.1 Healing of Erosive Esophagitis (EE) Adults Esomeprazole magnesium delayed-release capsules are 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 may be considered. Pediatric Patients 12 Years to 17 Years of Age Esomeprazole magnesium delayed-release capsules 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. 1.2 Maintenance of Healing of EE Esomeprazole magnesium delayed-release capsules are 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 delayed-release capsules are 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 delayed-release capsules are 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. 1.4 Risk Reduction of Nonsteroidal Anti-Inflammatory Drugs (NSAID)-Associated Gastric Ulcer Esomeprazole magnesium delayed-release capsules are 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 delayed-release capsules 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 delayed-release capsules are indicated for the long-term treatment of pathological hypersecretory conditions, including Zollinger-Ellison Syndrome, in adults.

2 DOSAGE AND ADMINISTRATION Population Recommended Adult (2.1) and Pediatric Dosage (2.2) Healing of EE (12 year and older) Adults 20 mg or 40 mg 1 once daily for 4 to 8 weeks; some patients may require an additional 4 to 8 weeks 12 years to 17 years 20 mg or 40 mg 1 once daily for 4 to 8 weeks Maintenance of Healing of EE Adults 20 mg once daily. Controlled studies do not extend beyond 6 months Treatment of Symptomatic GERD Adults 20 mg once daily once daily for 4 weeks some patients may require an additional 4 weeks 12 years to 17 years 20 mg once daily for 4 weeks Risk Reduction of NSAID-Associated Gastric Ulcer Adults 20 mg or 40 mg 1 once daily for up to 6 months 2 H. pylori Eradication to Reduce the Risk of Duodenal Ulcer Recurrence Adults Esomeprazole magnesium 40 mg 1 once daily for 10 days Amoxicillin 1000 mg twice daily for 10 days 3 Clarithromycin 500 mg twice daily for 10 days 3 Pathological Hypersecretory Conditions Including Zollinger-Ellison Syndrome Adults Starting dosage is 40 mg twice daily 4 (varies with the individual patient) as long as clinically indicated. 1 A maximum dosage of 20 mg once daily is recommended for patients with severe liver impairment (Child-Pugh Class C). 2 Controlled studies do not extend beyond 6 months. 3 Refer to the amoxicillin and clarithromycin prescribing information for dosage adjustments in elderly and renally-impaired patients. 4 A starting dosage of 20 mg twice daily is recommended for patients with severe liver impairment (Child-Pugh Class C). Preparation and Administration Information Swallow capsules whole; do not crush or chew. For patients who cannot swallow intact capsule, the capsule can be opened, and the contents mixed with applesauce. ( 2.3 ) Opened capsules can be administered through a nasogastric tube and oral suspension can be administered through a nasogastric tube. ( 2.3 ) 2.1 Recommended Dosage in Adults by Indication Table 1 shows the recommended adult dosage of esomeprazole magnesium by indication. The duration of esomeprazole magnesium treatment should be based on available safety and efficacy data specific to the defined indication and dosing frequency and individual patient medical needs. Esomeprazole magnesium should only be initiated and continued if the benefits outweigh the risks of treatment. Table 1: Recommended Dosage of esomeprazole magnesium in Adults by Indication Adult Indication Recommended Dosage of esomeprazole magnesium delayed-release capsules Treatment Duration Healing of EE 20 mg or 40 mg 1 once daily 4 to 8 weeks 2 Maintenance of Healing of EE 20 mg once daily Controlled studies do not extend beyond 6 months Treatment of Symptomatic GERD 20 mg once daily 4 weeks; if symptoms do not resolve completely, consider an additional 4 weeks Risk Reduction of NSAID-Associated Gastric Ulcer 20 mg or 40 mg 1 once daily Controlled studies do not extend beyond 6 months H. pylori Eradication to Reduce the Risk of Duodenal Ulcer Recurrence (Triple Therapy) Esomeprazole magnesium 40 mg once daily 1 10 days Amoxicillin 1000 mg twice daily 3 10 days Clarithromycin 500 mg twice daily 3 10 days Pathological Hypersecretory Conditions Including Zollinger-Ellison Syndrome Starting dosage is 40 mg twice daily 4 ; individualize the regimen to patient needs. Dosages of up to 240 mg/day have been administered [see Clinical Studies (14.7) ]. As long as clinically indicated A maximum dosage of 20 mg once daily is recommended for patients with severe liver impairment (Child-Pugh Class C) [see Use in Specific Populations ( 8.6 ) ]. Most patients are healed within 4 to 8 weeks. For patients who do not heal after 4 to 8 weeks, an additional 4 to 8 weeks of treatment may be required to achieve healing [see Clinical Studies ( 14.1 ) ] . Refer to the amoxicillin and clarithromycin prescribing information for dosage adjustments in elderly and renally-impaired patients. A starting dosage of 20 mg twice daily is recommended for patients with severe liver impairment (Child-Pugh Class C) [see Use in Specific Populations ( 8.6 ) ] . 2.2 Recommended Dosage in Pediatric Patients by Indication Table 2 shows the recommended dosage of esomeprazole magnesium in pediatric patients by indication. Table 2: Recommended Dosage of Esomeprazole Magnesium in Pediatric Patients by Indication Indication Patient Age Recommended Dosage Duration Healing of EE 12 years to 17 years Esomeprazole magnesium delayed-release capsules: 20 mg or 40 mg once daily 4 to 8 Weeks Treatment of Symptomatic GERD 12 years to 17 years Esomeprazole magnesium delayed-release capsules: 20 mg once daily 4 weeks 1 Dosages over 1 mg/kg/day have not been studied 2 Dosages over 1.33 mg/kg/day have not been studied 2.3 Preparation and Administration Instructions Take esomeprazole magnesium delayed-release capsules at least one hour before meals [see Clinical Pharmacology ( 12.3 ) ] . Antacids may be used concomitantly with esomeprazole magnesium. Take a missed dose as soon as possible. If it is almost time for the next dose, skip the missed dose and take the next dose at the regular scheduled time. Do not take 2 doses at the same time. Esomeprazole Magnesium Delayed-Release Capsules Administer esomeprazole magnesium delayed-release capsules orally or via a nasogastric tube, as described below. Oral Administration Swallow esomeprazole magnesium delayed-release capsules whole; do not chew or crush the capsules. For patients who have difficulty swallowing capsules, esomeprazole magnesium delayed-release capsules can be opened, and the contents sprinkled on applesauce. Use with other foods has not been evaluated and is not recommended. Add one tablespoon of applesauce to an empty bowl. The applesauce used should not be hot and should be soft enough to be swallowed without chewing. Open the esomeprazole magnesium delayed-release capsule and carefully empty the granules inside the capsule onto the applesauce. Mix the granules with the applesauce. Administer the mixture immediately. Do not chew or crush the granules Discard any remaining mixture. Do not store the mixture for future use. Administration via Nasogastric Tube Open the esomeprazole magnesium delayed-release capsule and empty the granules into a 60 mL catheter-tipped syringe. Mix the granules with 50 mL of water. Replace the plunger and shake the catheter-tipped syringe vigorously for 15 seconds. Hold the catheter-tipped syringe with the tip up and check for any granules remaining in the tip. Attach the catheter-tipped syringe to a nasogastric tube and deliver the contents of the syringe through the nasogastric tube into the stomach. After administering the granules, flush the nasogastric tube with additional water. Use the mixture immediately after preparation. Do not administer the granules if they have dissolved or disintegrated.

6 ADVERSE REACTIONS The following serious adverse reactions are described below and elsewhere in labeling: Acute Tubulointerstitial Nephritis [see Warnings and Precautions ( 5.2 ) ] Clostridium difficile -Associated Diarrhea [see Warnings and Precautions ( 5.3 ) ] Bone Fracture [see Warnings and Precautions ( 5.4 )] Severe Cutaneous Adverse Reactions [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 and Mineral Metabolism [see Warnings and Precautions ( 5.9 )] Fundic Gland Polyps [see Warnings and Precautions ( 5.13 ) ] Most common adverse reactions ( 6.1 ) : Adults (≥ 18 years) (≥1%) are: headache, diarrhea, nausea, flatulence, abdominal pain, constipation, and dry mouth. Pediatrics (1 to 17 years) ( > 2%) are: headache, diarrhea, abdominal pain, nausea, and somnolence. To report SUSPECTED ADVERSE REACTIONS, contact Ascend Laboratories, LLC at 1-877-272-7901 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 practice. Adults The safety of esomeprazole magnesium delayed-release capsules was evaluated in over 15,000 patients (aged 18 to 84 years) in clinical trials worldwide including over 8,500 patients in the United States and over 6,500 patients in Europe and Canada. Over 2,900 patients were treated in long-term studies for up to 6 to 12 months. The safety in the treatment of healing of EE in adults was assessed in four randomized comparative clinical trials, which included 1,240 patients who received esomeprazole magnesium 20 mg once daily, 2,434 patients on esomeprazole magnesium 40 mg once daily, and 3,008 patients on omeprazole 20 mg once daily. The most frequently occurring adverse reactions (at least 1%) in all three groups were headache (5.5%, 5%, and 3.8%, respectively) and diarrhea (no difference among the three groups). Nausea, flatulence, abdominal pain, constipation, and dry mouth occurred at similar rates among patients taking esomeprazole magnesium or omeprazole. Less common adverse reactions with an incidence of less than 1% are listed below by body system: Body as a Whole: abdomen enlarged, allergic reaction, asthenia, back pain, chest pain, substernal chest pain, facial edema, peripheral edema, hot flushes, fatigue, fever, flu-like disorder, generalized edema, leg edema, malaise, pain, rigors; Cardiovascular: flushing, hypertension, tachycardia; Endocrine: goiter; Gastrointestinal: bowel irregularity, constipation aggravated, dyspepsia, dysphagia, dysplasia GI, epigastric pain, eructation, esophageal disorder, frequent stools, gastroenteritis, GI hemorrhage, GI symptoms not otherwise specified, hiccup, melena, mouth disorder, pharynx disorder, rectal disorder, serum gastrin increased, tongue disorder, tongue edema, ulcerative stomatitis, vomiting; Hearing: earache, tinnitus; Hematologic: anemia, anemia hypochromic, cervical lymphadenopathy, epistaxis, leukocytosis, leukopenia, thrombocytopenia; Hepatic: bilirubinemia, hepatic function abnormal, SGOT increased, SGPT increased; Metabolic/Nutritional: glycosuria, hyperuricemia, hyponatremia, increased alkaline phosphatase, thirst, vitamin B12 deficiency, weight increase, weight decrease; Musculoskeletal: arthralgia, arthritis aggravated, arthropathy, cramps, fibromyalgia syndrome, hernia, polymyalgia rheumatica; Nervous System/Psychiatric: anorexia, apathy, appetite increased, confusion, depression aggravated, dizziness, hypertonia, nervousness, hypoesthesia, impotence, insomnia, migraine, migraine aggravated, paresthesia, sleep disorder, somnolence, tremor, vertigo, visual field defect; Reproductive: dysmenorrhea, menstrual disorder, vaginitis; Respiratory: asthma aggravated, coughing, dyspnea, larynx edema, pharyngitis, rhinitis, sinusitis; Skin and Appendages: acne, angioedema, dermatitis, pruritus, pruritus ani, rash, rash erythematous, rash maculo-papular, skin inflammation, sweating increased, urticaria; Special Senses: otitis media, parosmia, taste loss, taste perversion; Urogenital: abnormal urine, albuminuria, cystitis, dysuria, fungal infection, hematuria, micturition frequency, moniliasis, genital moniliasis, polyuria; Visual: conjunctivitis, vision abnormal. The following potentially clinically significant laboratory changes in clinical trials, irrespective of relationship to esomeprazole magnesium, were reported in 1% or less of patients: increased creatinine, uric acid, total bilirubin, alkaline phosphatase, ALT, AST, hemoglobin, white blood cell count, platelets, serum gastrin, potassium, sodium, thyroxine and thyroid stimulating hormone [see Clinical Pharmacology ( 12.2 ) ] . Decreases were seen in hemoglobin, white blood cell count, platelets, potassium, sodium, and thyroxine. Endoscopic findings that were reported as adverse reactions include: duodenitis, esophagitis, esophageal stricture, esophageal ulceration, esophageal varices, gastric ulcer, gastritis, hernia, benign polyps or nodules, Barrett’s esophagus, and mucosal discoloration. The incidence of adverse reactions during 6-month trials for the maintenance of healing of EE with esomeprazole magnesium 20 mg once daily was similar to placebo. There were no differences in types of adverse reactions seen during maintenance treatment up to 12 months compared to short-term treatment. Two placebo-controlled studies were conducted in 710 adult patients for the treatment of symptomatic GERD. The most common adverse reactions that were reported were: diarrhea (4%), headache (4%), and abdominal pain (4%). Combination Treatment with esomeprazole magnesium, Amoxicillin and Clarithromycin In clinical trials of H. pylori eradication of to reduce duodenal ulcer recurrence, no additional adverse reactions specific to the combination of esomeprazole magnesium delayed-release capsules, amoxicillin and clarithromycin were observed and were similar to those observed with esomeprazole magnesium, amoxicillin, or clarithromycin alone. The most frequently reported adverse reactions for patients who received esomeprazole magnesium, amoxicillin and clarithromycin for 10 days were diarrhea (9%), taste perversion (4%), and abdominal pain (4%). No adverse reactions were observed at higher rates with esomeprazole magnesium, amoxicillin and clarithromycin than were observed with esomeprazole magnesium alone. In clinical trials using of esomeprazole magnesium, amoxicillin and clarithromycin, no additional increased laboratory abnormalities particular to these drug combinations were observed. For more information on adverse reactions and laboratory changes with amoxicillin or clarithromycin, refer to Adverse Reactions section of the respective prescribing information. Pediatrics 1 Year to 17 Years of Age The safety of esomeprazole magnesium delayed-release capsules and NEXIUM for delayed-release oral suspension was evaluated in 316 pediatric and adolescent patients aged 1 year to 17 years in four clinical trials for the treatment of symptomatic GERD [see Clinical Studies ( 14.3 ) ] . In 109 pediatric patients aged 1 year to 11 years, the most frequently reported (at least 1%) treatment-related adverse reactions in these patients were diarrhea (3%), headache (2%) and somnolence (2%). In 149 pediatric patients aged 12 years to 17 years the most frequently reported adverse reactions (at least 2%) were headache (8%), abdominal pain (3%), diarrhea (2%), and nausea (2%). 6.2 Postmarketing Experience The following adverse reactions have been identified during post-approval use of esomeprazole. 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. These reports are listed below by body system: Blood and Lymphatic: agranulocytosis, pancytopenia; Eye: blurred vision; Gastrointestinal: pancreatitis; stomatitis; microscopic colitis; fundic gland polyps; Hepatobiliary: hepatic failure, hepatitis with or without jaundice; Immune System: anaphylactic reaction/shock; systemic lupus erythematosus; Infections and Infestations: GI candidiasis; Clostridium difficile -associated diarrhea; Metabolism and nutritional disorders: hypomagnesemia (may lead to hypocalcemia and/or hypokalemia) [see Warnings and Precautions ( 5.9) ]; Musculoskeletal and Connective Tissue: muscular weakness, myalgia, bone fracture; Nervous System: hepatic encephalopathy, taste disturbance; Psychiatric: aggression, agitation, depression, hallucination; Renal and Urinary: interstitial nephritis; Reproductive System and Breast: gynecomastia, erectile dysfunction; Respiratory, Thoracic, and Mediastinal: bronchospasm; Skin and Subcutaneous Tissue: alopecia, erythema multiforme, hyperhidrosis, photosensitivity, Stevens-Johnson syndrome, toxic epidermal necrolysis (some fatal), drug reaction with eosinophilia and systemic symptoms (DRESS), and acute generalized exanthematous pustulosis (AGEP), cutaneous lupus erythematosus. Adverse reactions associated with omeprazole may also be expected to occur with esomeprazole. See the full prescribing information for omeprazole for complete safety information.

12.3 Pharmacokinetics Absorption Esomeprazole magnesium delayed-release capsules and NEXIUM for delayed-release oral suspension 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 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 micromol*hr/L on Day 1 to 11.2 micromol*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 is decreased by 43% to 53% after food intake compared to fasting conditions [see Dosage and Administration ( 2.3 ) ] . The pharmacokinetics 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 Esomeprazole magnesium delayed-release capsules Parameter 1 (CV) 40 mg once daily (n=36) 20 mg once daily (n=36) AUC (micromol·h/L) 12.6 (42%) 4.2 (59%) C max (micromol/L) 4.7 (37%) 2.1 (45%) T max (hours) 1.6 1.6 t 1/2 (hours) 1.5 1.2 1. Values represent the geometric mean, except the T max , which is the arithmetic mean; CV = Coefficient of variation 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 micromol/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 1000 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 magnesium 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% and 22%, respectively, during combination therapy compared to treatment with clarithromycin alone. This increase in exposure to 14-hydroxyclarithromycin is not considered to be clinically relevant. Specific Populations Geriatric Patients The AUC and C max values of esomeprazole were slightly higher (25% and 18%, respectively) in the elderly as compared to younger subjects at steady state. This increase in exposure is not considered clinically relevant. Pediatric Patients 12 Years to 17 Years of Age The pharmacokinetics of esomeprazole magnesium were studied in 28 adolescent patients with GERD aged 12 to 17 years inclusive, in a single center study. Patients were randomized to receive esomeprazole magnesium 20 mg or 40 mg once daily for 8 days. Mean C max and AUC values of esomeprazole were not affected by body weight or age; and more than dose-proportional increases in mean C max and AUC values were observed between the two dose groups in the study. Overall, esomeprazole magnesium pharmacokinetics in adolescent patients aged 12 to 17 years were similar to those observed in adult patients with symptomatic GERD. See Table 9. Table 9: Comparison of Esomeprazole Pharmacokinetic Parameters Following Once Daily Dosing of Esomeprazole Magnesium Delayed-Release Capsules in Pediatric Patients 12 Years to 17 Years with GERD and Adults with Symptomatic GERD 1 Parameter Esomeprazole Magnesium Delayed-Release Capsules 12 Years to 17 Years (N=28) Adults (N=36) 20 mg once daily for 8 days 40 mg once daily for 8 days 20 mg once daily for 5 days 40 mg once daily for 5 days AUC (micromol·h/L) 3.65 13.86 4.2 12.6 C max (micromol/L) 1.45 5.13 2.1 4.7 t max (h) 2.00 1.75 1.6 1.6 t ½ λz (h) 0.82 1.22 1.2 1.5 Data presented are geometric means for AUC, C max and t ½λz , and median value for t max . 1. Data obtained from two independent studies Male and Female Patients The AUC and C max values of esomeprazole were slightly higher (13%) in females than in males at steady state when dosed orally. This increase in exposure is not considered clinically relevant. Patients with Renal Impairment The pharmacokinetics of esomeprazole magnesium in patients with renal impairment are not expected to be altered relative to healthy subjects as less than 1% of esomeprazole is excreted unchanged in urine. Patients with Hepatic Impairment The steady state pharmacokinetics of esomeprazole obtained after administration of esomeprazole magnesium delayed-release capsules 40 mg orally once daily to patients with mild (Child-Pugh Class A, n=4), moderate (Child-Pugh Class B, n=4), and severe (Child-Pugh Class C, n=4) hepatic impairment were compared to those obtained in 36 male and female GERD patients with normal liver function. In patients with mild and moderate hepatic impairment, the AUCs were within the range that could be expected in patients with normal liver function. In patients with severe hepatic impairment the AUCs were 2 to 3 times higher than in the patients with normal liver function [see Use in Specific Populations ( 8.6 ) ] . Drug Interaction Studies Effect of Esomeprazole/Omeprazole on Other Drugs In vitro and in vivo studies have shown that esomeprazole is not likely to inhibit CYPs 1A2, 2A6, 2C9, 2D6, 2E1 and 3A4. Antiretrovirals For some antiretroviral drugs, such as rilpivirine, atazanavir and nelfinavir, decreased serum concentrations have been reported when given together with omeprazole [see Drug Interactions ( 7 ) ]. Rilpivirine: Following multiple doses of rilpivirine (150 mg, daily) and omeprazole (20 mg, daily), AUC was decreased by 40%, C max by 40%, and C min by 33% for rilpivirine [see Contraindications (4) ] . Nelfinavir: 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. Atazanavir: 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%. Saquinavir: 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. The AUC was increased by 82%, C max by 75%, and C min by 106%. The mechanism behind this interaction is not fully elucidated. Clopidogrel In a crossover study, healthy subjects were administered clopidogrel (300 mg loading dose followed by 75 mg per day as the maintenance dosage for 28 days) alone and with esomeprazole (40 mg orally once daily at the same time as clopidogrel) for 29 days. Exposure to the active metabolite of clopidogrel was reduced by 35% to 40% over this time period when clopidogrel and esomeprazole were administered together. Pharmacodynamic parameters were also measured and demonstrated that the change in inhibition of platelet aggregation was related to the change in the exposure to clopidogrel active metabolite [see Warnings and Precautions ( 5.7 ) and Drug Interactions ( 7 ) ] . Mycophenolate Mofetil Administration of omeprazole 20 mg twice daily for 4 days and a single 1000 mg dose of MMF approximately one hour after the last dose of omeprazole to 12 healthy subjects in a cross-over study resulted in a 52% reduction in the C max and 23% reduction in the AUC of MPA [see Drug Interactions ( 7 ) ] . Cilostazol Omeprazole acts as an inhibitor of CYP2C19. Omeprazole, given in doses of 40 mg daily for one week to 20 healthy subjects in cross-over study, increased C max and AUC of cilostazol by 18% and 26% respectively. The C max and AUC of one of the active metabolites, 3,4-dihydro-cilostazol, which has 4 to 7 times the activity of cilostazol, were increased by 29% and 69%, respectively. Co-administration of cilostazol with omeprazole is expected to increase concentrations of cilostazol and the above mentioned active metabolite [see Drug Interactions ( 7 ) ] . Diazepam Co-administration of esomeprazole 30 mg and diazepam, a CYP2C19 substrate, resulted in a 45% decrease in clearance of diazepam. Increased plasma levels of diazepam were observed 12 hours after dosing and onwards. However, at that time, the plasma levels of diazepam were below the therapeutic interval, and thus this interaction is unlikely to be of clinical relevance. Digoxin Concomitant administration of omeprazole 20 mg once daily and digoxin in healthy subjects increased the bioavailability of digoxin by 10% (30% in two subjects) [ see Drug Interactions ( 7 ) ] . Other Drugs Concomitant administration of esomeprazole and either naproxen (non-selective NSAID) did not identify any clinically relevant changes in the pharmacokinetic profiles of these NSAIDs. Effect of Other Drugs on Esomeprazole/Omeprazole St. John’s Wort In a cross-over study in 12 healthy male subjects, St. John’s Wort (300 mg three times daily for 14 days) significantly decreased the systemic exposure of omeprazole in CYP2C19 poor metabolizers (C max and AUC both decreased by 38%) and extensive metabolizers (C max and AUC decreased by 50% and 44%, respectively) [see Drug Interactions ( 7 ) ] . Voriconazole Concomitant administration of omeprazole and voriconazole (a combined inhibitor of CYP2C19 and CYP3A4) resulted in more than doubling of the omeprazole exposure. When voriconazole (400 mg every 12 hours for one day, followed by 200 mg once daily for 6 days) was given with omeprazole (40 mg once daily for 7 days) to healthy subjects, the steady-state C max and AUC 0-24 of omeprazole significantly increased: 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 [see Drug Interactions ( 7 ) ] . Other Drugs Co-administration of esomeprazole with oral contraceptives, diazepam, phenytoin, quinidine, naproxen (non-selective NSAID) did not seem to change the pharmacokinetic profile of esomeprazole.