The active ingredient in PREVACID Delayed-Release Capsules and PREVACID SoluTab Delayed-Release Orally Disintegrating Tablets is lansoprazole, a substituted benzimidazole, 2-[[[3-methyl-4-(2,2,2-trifluoroethoxy)-2-pyridyl] methyl] sulfinyl] benzimidazole, a compound that inhibits gastric acid secretion. Its empirical formula is C 16 H 14 F 3 N 3 O 2 S with a molecular weight of 369.37. Lansoprazole has the following structure: Lansoprazole is a white to brownish-white odorless crystalline powder which melts with decomposition at approximately 166°C. Lansoprazole is freely soluble in dimethylformamide; soluble in methanol; sparingly soluble in ethanol; slightly soluble in ethyl acetate, dichloromethane and acetonitrile; very slightly soluble in ether; and practically insoluble in hexane and water. Lansoprazole is stable when exposed to light for up to two months. The rate of degradation of the compound in aqueous solution increases with decreasing pH. The degradation half-life of the drug substance in aqueous solution at 25°C is approximately 0.5 hour at pH 5.0 and approximately 18 hours at pH 7.0. PREVACID is supplied in delayed-release capsules and PREVACID SoluTab is supplied in delayed-release orally disintegrating tablets (SoluTab) for oral administration. PREVACID is available in one dosage strength: 30 mg of lansoprazole per capsule. Each delayed-release capsule contains enteric-coated granules consisting of 30 mg of lansoprazole (active ingredient) and the following inactive ingredients: sugar sphere, sucrose, methacrylic acid copolymer, low substituted hydroxypropyl cellulose, starch, magnesium carbonate, talc, polyethylene glycol, titanium dioxide, polysorbate 80, hydroxypropyl cellulose, colloidal silicon dioxide, D&C Red No. 28, FD&C Blue No. 1, and FD&C Red No. 40. The 15 mg strength of PREVACID is not currently marketed by Takeda Pharmaceuticals America, Inc. PREVACID SoluTab is available in two dosage strengths: 15 and 30 mg of lansoprazole per tablet. Each delayed-release orally disintegrating tablet contains enteric-coated microgranules consisting of 15 or 30 mg of lansoprazole (active ingredient) and the following inactive ingredients: mannitol, methacrylic acid, hydroxypropyl cellulose, lactose monohydrate-microcrystalline cellulose sphere, triethyl citrate, crospovidone, polyacrylate, magnesium carbonate, aspartame Phenylketonurics: PREVACID SoluTab Contains Phenylalanine 2.5 mg per 15 mg Tablet and 5.1 mg per 30 mg Tablet. , glyceryl monostearate, hypromellose, magnesium stearate, citric acid, titanium dioxide, talc, artificial strawberry flavor, polyethylene glycol, polysorbate 80 and ferric oxide. Chemical Structure

PREVACID and PREVACID SoluTab are proton pump inhibitors (PPIs) indicated for the: Treatment of active duodenal ulcer in adults. Eradication of H. pylori to reduce the risk of duodenal ulcer recurrence in adults. Maintenance of healed duodenal ulcers in adults. Treatment of active benign gastric ulcer in adults. Healing of nonsteroidal anti-inflammatory drugs (NSAID)-associated gastric ulcer in adults. Risk reduction of NSAID-associated gastric ulcer in adults. Treatment of symptomatic gastroesophageal reflux disease (GERD) in adults and pediatric patients 1 year of age and older. Treatment of erosive esophagitis (EE) in adults and pediatric patients 1 year of age and older. Maintenance of healing of EE in adults. Pathological hypersecretory conditions, including Zollinger-Ellison syndrome (ZES) in adults

Treatment of Active Duodenal Ulcer PREVACID and PREVACID SoluTab are indicated in adults for short-term treatment (for four weeks) for healing and symptom relief of active duodenal ulcer

Eradication of H. pylori to Reduce the Risk of Duodenal Ulcer Recurrence Triple Therapy: PREVACID or PREVACID SoluTab/amoxicillin/clarithromycin PREVACID or PREVACID SoluTab in combination with amoxicillin plus clarithromycin as triple therapy is indicated in adults for the treatment of patients with H. pylori infection and duodenal ulcer disease (active or one year history of a duodenal ulcer) to eradicate H. pylori. Eradication of H. pylori has been shown to reduce the risk of duodenal ulcer recurrence . Please refer to the full prescribing information for amoxicillin and clarithromycin. Dual Therapy: PREVACID or PREVACID SoluTab/amoxicillin PREVACID or PREVACID SoluTab in combination with amoxicillin as dual therapy is indicated in adults for the treatment of patients with H. pylori infection and duodenal ulcer disease (active or one year history of a duodenal ulcer) who are either allergic or intolerant to clarithromycin or in whom resistance to clarithromycin is known or suspected . Eradication of H. pylori has been shown to reduce the risk of duodenal ulcer recurrence . Please refer to the full prescribing information for amoxicillin

Maintenance of Healed Duodenal Ulcers PREVACID and PREVACID SoluTab are indicated in adults to maintain healing of duodenal ulcers. Controlled studies do not extend beyond 12 months

Treatment of Active Benign Gastric Ulcer PREVACID and PREVACID SoluTab are indicated in adults for short-term treatment (up to eight weeks) for healing and symptom relief of active benign gastric ulcer

Healing of NSAID-Associated Gastric Ulcer PREVACID and PREVACID SoluTab are indicated in adults for the treatment of NSAID-associated gastric ulcer in patients who continue NSAID use. Controlled studies did not extend beyond eight weeks

Risk Reduction of NSAID-Associated Gastric Ulcer PREVACID and PREVACID SoluTab are indicated in adults for reducing the risk of NSAID-associated gastric ulcers in patients with a history of a documented gastric ulcer who require the use of an NSAID. Controlled studies did not extend beyond 12 weeks

Treatment of Symptomatic Gastroesophageal Reflux Disease (GERD) PREVACID and PREVACID SoluTab are indicated for short-term treatment in adults and pediatric patients 12 to 17 years of age (up to eight weeks) and pediatric patients one to 11 years of age (up to 12 weeks) for the treatment of heartburn and other symptoms associated with GERD

Treatment of Erosive Esophagitis (EE) PREVACID and PREVACID SoluTab are indicated for short-term treatment in adults and pediatric patients 12 to 17 years of age (up to eight weeks) and pediatric patients one to 11 years of age (up to 12 weeks) for healing and symptom relief of all grades of EE. For adults who do not heal with PREVACID or PREVACID SoluTab for eight weeks (5 to 10%), it may be helpful to give an additional eight weeks of treatment. If there is a recurrence of erosive esophagitis an additional eight week course of PREVACID or PREVACID SoluTab may be considered

Maintenance of Healing of EE PREVACID and PREVACID SoluTab are indicated in adults to maintain healing of EE. Controlled studies did not extend beyond 12 months

Pathological Hypersecretory Conditions Including Zollinger-Ellison Syndrome (ZES) PREVACID and PREVACID SoluTab are indicated in adults for the long-term treatment of pathological hypersecretory conditions, including Zollinger-Ellison syndrome .

PREVACID delayed-release capsules: 15 mg strength is not currently marketed by Takeda Pharmaceuticals America, Inc. 30 mg strength is an opaque, pink and black capsule imprinted with "TAP" and "PREVACID 30". PREVACID SoluTab delayed-release orally disintegrating tablets: 15 mg strength is a white to yellowish white, uncoated round tablet containing orange to dark brown speckles with "15" debossed on one side. 30 mg strength is a white to yellowish white, uncoated round tablet containing orange to dark brown speckles with "30" debossed on one side. Delayed-release capsules: 30 mg. Delayed-release orally disintegrating tablets: 15 mg and 30 mg.

Recommended Dosage : See full prescribing information for complete dosing information for PREVACID and PREVACID SoluTab by indication and age group and dosage adjustment in patients with severe hepatic impairment. ( 2.1 , 2.2 , 2.3 ) Administration Instructions PREVACID capsules Should be swallowed whole. See full prescribing information for alternative administration options. PREVACID SoluTab Should not be broken or cut. Should not be chewed. Place the tablet on the tongue and allow it to disintegrate, with or without water, until the particles can be swallowed. See full prescribing information for alternative administration options

Recommended Adult Dosage by Indication Indication Recommended Dose Frequency Duodenal Ulcers Short-Term Treatment 15 mg Once daily for 4 weeks Maintenance of Healed 15 mg Once daily Eradication of H. pylori to Reduce the Risk of Duodenal Ulcer Recurrence Please refer to the amoxicillin and clarithromycin full prescribing information, Contraindications and Warnings and Precautions sections, and for information regarding dosing in elderly and renally-impaired patients. Triple Therapy: PREVACID or PREVACID SoluTab 30 mg Twice daily for 10 or 14 days Amoxicillin 1 gram Twice daily for 10 or 14 days Clarithromycin 500 mg Twice daily for 10 or 14 days Dual Therapy: PREVACID or PREVACID SoluTab 30 mg Three times daily for 14 days Amoxicillin 1 gram Three times daily for 14 days Benign Gastric Ulcer Short-Term Treatment 30 mg Once daily for up to 8 weeks NSAID-Associated Gastric Ulcer Healing 30 mg Once daily for 8 weeks Controlled studies did not extend beyond indicated duration. Risk Reduction 15 mg Once daily for up to 12 weeks Gastroesophageal Reflux Disease (GERD) Short-Term Treatment of Symptomatic GERD 15 mg Once daily for up to 8 weeks Short-Term Treatment of Erosive Esophagitis 30 mg Once daily for up to 8 weeks For patients who do not heal with PREVACID or PREVACID SoluTab for eight weeks (5 to 10%), it may be helpful to give an additional eight weeks of treatment. If there is a recurrence of erosive esophagitis, an additional eight week course of PREVACID or PREVACID SoluTab may be considered. Maintenance of Healing of Erosive Esophagitis 15 mg Once daily Controlled studies did not extend beyond 12 months. Pathological Hypersecretory Conditions Including Zollinger-Ellison Syndrome 60 mg Once daily Varies with individual patient. Recommended adult starting dose is 60 mg once daily. Doses should be adjusted to individual patient needs and should continue for as long as clinically indicated. Dosages up to 90 mg twice daily have been administered. Daily dose of greater than 120 mg should be administered in divided doses. Some patients with Zollinger-Ellison syndrome have been treated continuously with PREVACID for more than four years

Recommended Pediatric Dosage by Indication Pediatric Patients 1 to 11 Years of Age In clinical studies, PREVACID was not administered beyond 12 weeks in 1 to 11 year olds. It is not known if PREVACID is safe and effective if used longer than the recommended duration. Do not exceed the recommended dose and duration of use in pediatric patients as outlined below . Indication Recommended Dose Frequency Short-Term Treatment of Symptomatic GERD and Short-Term Treatment of Erosive Esophagitis ≤30 kg 15 mg Once daily for up to 12 weeks >30 kg 30 mg Once daily for up to 12 weeks Pediatric Patients 12 to 17 Years of Age Indication Recommended Dose Frequency Short-Term Treatment of Symptomatic GERD Non-erosive GERD 15 mg Once daily for up to 8 weeks Erosive Esophagitis 30 mg Once daily for up to 8 weeks 2.3 Hepatic Impairment The recommended dosage is 15 mg orally daily in patients with severe liver impairment (Child-Pugh C)

Important Administration Information Take PREVACID or PREVACID SoluTab before meals. Do not crush or chew PREVACID capsule or PREVACID SoluTab. Take PREVACID or PREVACID SoluTab at least 30 minutes prior to sucralfate . Antacids may be used concomitantly with PREVACID or PREVACID SoluTab. Missed doses: If a dose is missed, administer as soon as possible. However, if the next scheduled dose is due, do not take the missed dose, and take the next dose on time. Do not take two doses at one time to make up for a missed dose. PREVACID capsules Swallow whole; do not chew. For patients who have difficulty swallowing capsules, PREVACID capsules can be opened and administered orally or via a nasogastric tube in the soft foods or liquids specified below. Administration of PREVACID in foods or liquids other than those discussed below have not been studied clinically and therefore are not recommended. Administration in Soft Foods (applesauce, ENSURE pudding, cottage cheese, yogurt or strained pears): Open capsule. Sprinkle intact granules on one tablespoon of either applesauce, ENSURE pudding, cottage cheese, yogurt or strained pears. Swallow immediately. Administration in Liquids (apple juice, orange juice or tomato juice): Open capsule. Sprinkle intact granules into a small volume of either apple juice, orange juice or tomato juice (60 mL – approximately two ounces). Mix briefly. Swallow immediately. To ensure complete delivery of the dose, rinse the glass with two or more volumes of juice and swallow the contents immediately. Administration with Apple Juice Through a Nasogastric Tube (≥16 French) Open capsule. Sprinkle intact granules into 40 mL of apple juice. Mix briefly. Using a catheter-tipped syringe, draw up the mixture. Inject through the nasogastric tube into the stomach. Flush with additional apple juice to clear the tube. PREVACID SoluTab Do not break or cut. Place the tablet on the tongue, allow it to disintegrate, with or without water, until the microgranules can be swallowed. Do not chew the microgranules. The tablet typically disintegrates in less than one minute. Alternatively, for children or other patients who have difficulty swallowing tablets, PREVACID SoluTab can be administered with water via oral syringe or NG tube as follows: Administration with Water in an Oral Syringe Place a 15 mg tablet in oral syringe and draw up 4 mL of water, or place a 30 mg tablet in oral syringe and draw up 10 mL of water. Shake gently to allow for a quick dispersal. After the tablet has dispersed, administer the contents within 15 minutes of mixing into the mouth. Do not save the water and microgranule mixture for later use. Refill the syringe with approximately 2 mL (5 mL for the 30 mg tablet) of water, shake gently, and administer any remaining contents. Administration with Water via a NG Tube (≥8 French) Place a 15 mg tablet in a catheter-tip syringe and draw up 4 mL of water, or place a 30 mg tablet in a catheter-tip syringe and draw up 10 mL of water. Shake gently to allow for a quick dispersal. After the tablet has dispersed, shake the catheter-tip syringe gently in order to keep the microgranules from settling, and immediately inject the mixture through the NG tube into the stomach within 15 minutes of mixing. Do not save the water and microgranule mixture for later use. Refill the catheter-tip syringe with approximately 5 mL of water, shake gently, and flush the tube.

Gastric Malignancy : In adults, symptomatic response with PREVACID or PREVACID SoluTab does not preclude the presence of gastric malignancy. Consider additional follow-up and diagnostic testing. Acute Tubulointerstitial Nephritis : Discontinue treatment and evaluate patients. Clostridium difficile -Associated Diarrhea : PPI therapy may be associated with increased risk of Clostridium difficile -associated diarrhea. 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. 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. Cutaneous and Systemic Lupus Erythematosus : Mostly cutaneous; new onset or exacerbation of existing disease; discontinue PREVACID and PREVACID SoluTab and refer to specialist for evaluation. Cyanocobalamin (Vitamin B12) Deficiency : Daily long-term use (e.g., longer than 3 years) may lead to malabsorption or a deficiency of cyanocobalamin. Hypomagnesemia and Mineral Metabolism : Hypomagnesemia has been reported rarely with prolonged treatment with PPIs. Interactions with Investigations for Neuroendocrine Tumors : Increases in intragastric pH may result in hypergastrinemia and enterochromaffin-like cell hyperplasia and increased chromogranin A levels which may interfere with diagnostic investigations for neuroendocrine tumors. ( 5.9 , 7 ) 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 a temporary withdrawal of PREVACID. ( 5.10 , 7 ) Patients with Phenylketonuria : Each 15 mg PREVACID SoluTab contains 2.5 mg and each 30 mg PREVACID SoluTab contains 5.1 mg of phenylalanine. Fundic Gland Polyps : Risk increases with long-term use, especially beyond 1 year. Use the shortest duration of therapy. Risk of Heart Valve Thickening in Pediatric Patients Less than One Year of Age : PREVACID is not recommended in pediatric patients less than 1 year of age. ( 5.13 , 8.4 ) 5.1 Presence of Gastric Malignancy In adults, symptomatic response to therapy with PREVACID or PREVACID SoluTab does 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

Acute Tubulointerstitial Nephritis Acute tubulointerstial 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 PREVACID or PREVACID SoluTab and evaluate patients with suspected acute TIN

Clostridium difficile -Associated Diarrhea Published observational studies suggest that PPI therapy like PREVACID and PREVACID SoluTab may be associated with an increased risk of Clostridium difficile -associated diarrhea (CDAD), especially in hospitalized patients. This diagnosis should be considered for diarrhea that does not improve . Patients should use the lowest dose and shortest duration of PPI therapy appropriate to the condition being treated. 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 PREVACID or PREVACID SoluTab, refer to Warnings and Precautions section of their prescribing information

Bone Fracture Several published observational studies suggest that 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

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 . Discontinue PREVACID or PREVACID SoluTab at the first signs or symptoms of severe cutaneous adverse reactions or other signs of hypersensitivity and consider further evaluation

Cutaneous and Systemic Lupus Erythematosus Cutaneous lupus erythematosus (CLE) and systemic lupus erythematosus (SLE) have been reported in patients taking PPIs, including lansoprazole. 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 nondrug 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 PREVACID or PREVACID SoluTab, discontinue the drug and refer the patient to the appropriate specialist for evaluation. Most patients improve with discontinuation of the PPI alone in four to 12 weeks. Serological testing (e.g., ANA) may be positive and elevated serological test results may take longer to resolve than clinical manifestations

Cyanocobalamin (Vitamin B12) Deficiency Daily treatment with any acid-suppressing medications over a long period of time (e.g., longer than three years) may lead to malabsorption of cyanocobalamin (Vitamin B12) 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 cyanocobalamin deficiency are observed in patients treated with PREVACID or PREVACID SoluTab

Hypomagnesemia and Mineral Metabolism Hypomagnesemia, symptomatic and asymptomatic, has been reported rarely in patients treated with PPIs for at least three months, in most cases after a year of therapy. Serious adverse events include tetany, arrhythmias, and seizures. Hypomagnesemia may lead to hypocalcemia and/or hypokalemia and may exacerbate underlying hypocalcemia in at-risk patients. In most patients, treatment of hypomagnesemia required magnesium replacement and discontinuation of the PPI. For patients expected to be on prolonged treatment or who take PPIs with medications such as digoxin or drugs that may cause hypomagnesemia (e.g., diuretics), health care professionals may consider monitoring magnesium levels prior to initiation of PPI treatment and periodically . Consider monitoring magnesium and calcium levels prior to initiation of PREVACID or PREVACID SoluTab and periodically while on treatment in patients with a preexisting risk of hypocalcemia (e.g., hypoparathyroidism). Supplement with magnesium and/or calcium, as necessary. If hypocalcemia is refractory to treatment, consider discontinuing the PPI

Interactions with Investigations for Neuroendocrine Tumors Serum chromogranin A (CgA) levels increase secondary to drug-induced decreases in gastric acidity. The increased CgA level may cause false positive results in diagnostic investigations for neuroendocrine tumors. Healthcare providers should temporarily stop lansoprazole treatment at least 14 days before assessing CgA levels and consider repeating the test if initial CgA levels are high. If serial tests are performed (e.g., for monitoring), the same commercial laboratory should be used for testing, as reference ranges between tests may vary

Interaction with Methotrexate Literature suggests that concomitant use of PPIs with methotrexate (primarily at high dose) may elevate and prolong serum levels of methotrexate and/or its metabolite, possibly leading to methotrexate toxicities. In high-dose methotrexate administration, a temporary withdrawal of the PPI may be considered in some patients

Patients with Phenylketonuria Phenylalanine can be harmful to patients with phenylketonuria (PKU). PREVACID SoluTab contains phenylalanine, a component of aspartame. Each 15 mg tablet contains 2.5 mg and each 30 mg tablet contains 5.1 mg of phenylalanine. Before prescribing PREVACID SoluTab to a patient with PKU, consider the combined daily amount of phenylalanine from all sources, including PREVACID SoluTab

Fundic Gland Polyps PPI use is associated with an increased risk of fundic gland polyps that increases with long-term use, especially beyond one year. Most PPI users who developed fundic gland polyps were asymptomatic and fundic gland polyps were identified incidentally on endoscopy. Use the shortest duration of PPI therapy appropriate to the condition being treated

Risk of Heart Valve Thickening in Pediatric Patients Less Than One Year of Age PREVACID and PREVACID SoluTab are not approved in pediatric patients less than one year of age. Nonclinical studies in juvenile rats with lansoprazole have demonstrated an adverse effect of heart valve thickening. The risk of heart valve injury does not appear to be relevant to patients one year of age and older .

Tables 2 and 3 include drugs with clinically important drug interactions and interaction with diagnostics when administered concomitantly with PREVACID or PREVACID SoluTab and instructions for preventing or managing them. Consult the labeling of concomitantly used drugs to obtain further information about interactions with PPIs. Table 2. Clinically Relevant Interactions Affecting Drugs Coadministered with PREVACID or PREVACID SoluTab and Interactions with Diagnostics Antiretrovirals Clinical Impact: The effect of PPIs on antiretroviral drugs is variable. The clinical importance and the mechanisms behind these interactions are not always known. Decreased exposure of some antiretroviral drugs (e.g., rilpivirine, atazanavir, and nelfinavir) when used concomitantly with lansoprazole may reduce antiviral effect and promote the development of drug resistance. Increased exposure of other antiretroviral drugs (e.g., saquinavir) when used concomitantly with lansoprazole may increase toxicity of the antiretroviral drugs. There are other antiretroviral drugs which do not result in clinically relevant interactions with lansoprazole. Intervention: Rilpivirine-containing products : Concomitant use with PREVACID or PREVACID SoluTab is contraindicated . See prescribing information. Atazanavir : See prescribing information for atazanavir for dosing information. Nelfinavir : Avoid concomitant use with PREVACID or PREVACID SoluTab. See prescribing information for nelfinavir. Saquinavir : See the prescribing information for saquinavir and monitor for potential saquinavir toxicities. Other antiretrovirals : See prescribing information. Warfarin Clinical Impact: Increased INR and prothrombin time in patients receiving PPIs and warfarin concomitantly. Increases in INR and prothrombin time may lead to abnormal bleeding and even death. Intervention: Monitor INR and prothrombin time. Dose adjustment of warfarin may be needed to maintain target INR range. See prescribing information for warfarin. Methotrexate Clinical Impact: Concomitant use of PPIs with methotrexate (primarily at high dose) may elevate and prolong serum concentrations of methotrexate and/or its metabolite hydroxymethotrexate, possibly leading to methotrexate toxicities. No formal drug interaction studies of high-dose methotrexate with PPIs have been conducted . Intervention: A temporary withdrawal of PREVACID or PREVACID SoluTab may be considered in some patients receiving high-dose methotrexate. Digoxin Clinical Impact: Potential for increased exposure of digoxin. Intervention: Monitor digoxin concentrations. Dose adjustment of digoxin may be needed to maintain therapeutic drug concentrations. See prescribing information for digoxin. Theophylline Clinical Impact: Increased clearance of theophylline . Intervention: Individual patients may require additional titration of their theophylline dosage when PREVACID or PREVACID SoluTab is started or stopped to ensure clinically effective blood concentrations. Drugs Dependent on Gastric pH for Absorption (e.g., iron salts, erlotinib, dasatinib, nilotinib, mycophenolate mofetil, ketoconazole/itraconazole) Clinical Impact: Lansoprazole can reduce the absorption of other drugs due to its effect on reducing intragastric acidity. Intervention: Mycophenolate mofetil (MMF): Coadministration of PPIs 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 PREVACID and MMF. Use PREVACID and PREVACID SoluTab with caution in transplant patients receiving MMF. See the prescribing information for other drugs dependent on gastric pH for absorption. Combination Therapy with Clarithromycin and Amoxicillin Clinical Impact: Concomitant administration of clarithromycin with other drugs can lead to serious adverse reactions, including potentially fatal arrhythmias, and are contraindicated. Amoxicillin also has drug interactions. Intervention: See Contraindications and Warnings and Precautions in prescribing information for clarithromycin. See Drug Interactions in prescribing information for amoxicillin. Tacrolimus Clinical Impact: Potentially increased exposure of tacrolimus, especially in transplant patients who are intermediate or poor metabolizers of CYP2C19. Intervention: Monitor tacrolimus whole blood trough concentrations. Dose adjustment of tacrolimus may be needed to maintain therapeutic drug concentrations. See prescribing information for tacrolimus. Interactions with Investigations of Neuroendocrine Tumors Clinical Impact: CgA levels increase secondary to PPI-induced decreases in gastric acidity. The increased CgA level may cause false positive results in diagnostic investigations for neuroendocrine tumors . Intervention: Temporarily stop PREVACID or PREVACID SoluTab treatment at least 14 days before assessing CgA levels and consider repeating the test if initial CgA levels are high. If serial tests are performed (e.g., for monitoring), the same commercial laboratory should be used for testing, as reference ranges between tests may vary. Interaction with Secretin Stimulation Test Clinical Impact: Hyper-response in gastrin secretion in response to secretin stimulation test, falsely suggesting gastrinoma. Intervention: Temporarily stop PREVACID or PREVACID SoluTab treatment at least 28 days before assessing to allow gastrin levels to return to baseline . False Positive Urine Tests for THC Clinical Impact: There have been reports of false positive urine screening tests for tetrahydrocannabinol (THC) in patients receiving PPIs. Intervention: An alternative confirmatory method should be considered to verify positive results. Table 3. Clinically Relevant Interactions Affecting PREVACID or PREVACID SoluTab When Coadministered with Other Drugs CYP2C19 OR CYP3A4 Inducers Clinical Impact: Decreased exposure of lansoprazole when used concomitantly with strong inducers . Intervention: St John's Wort, rifampin : Avoid concomitant use with PREVACID or PREVACID SoluTab. Ritonavir-containing products : See prescribing information. CYP2C19 or CYP3A4 Inhibitors Clinical Impact: Increased exposure of lansoprazole is expected when used concomitantly with strong inhibitors . Intervention: Voriconazole : See prescribing information. Sucralfate Clinical Impact: Decreased and delayed absorption of lansoprazole . Intervention: Take PREVACID or PREVACID SoluTab at least 30 minutes prior to sucralfate . See full prescribing information for a list of clinically important drug interactions.