MONTELUKAST SODIUM tablet, chewable

montelukast sodium by

Drug Labeling and Warnings

montelukast sodium by is a Prescription medication manufactured, distributed, or labeled by Preferred Pharmaceuticals, Inc.. Drug facts, warnings, and ingredients follow.

Drug Details [pdf]

  • 1 INDICATIONS & USAGE

    1.1 Asthma

    Montelukast sodium chewable tablets are indicated for the prophylaxis and chronic treatment of asthma in adults and pediatric patients 2 years of age and older.

    1.2 Exercise-Induced Bronchoconstriction (EIB)

    Montelukast sodium chewable tablets are indicated for prevention of exercise-induced bronchoconstriction (EIB) in patients 6 years of age and older.

    1.3 Allergic Rhinitis

    Montelukast sodium chewable tablets are indicated for the relief of symptoms of seasonal allergic rhinitis in patients 2 years of age and older and perennial allergic rhinitis in patients 2 years of age and older.

  • 2 DOSAGE & ADMINISTRATION

    2.1 Asthma

    Montelukast sodium chewable tablets should be taken once daily in the evening. The following doses are recommended:
    For adults and adolescents 15 years of age and older: one 10-mg tablet.
    For pediatric patients 6 to 14 years of age: one 5-mg chewable tablet.
    For pediatric patients 2 to 5 years of age: one 4-mg chewable tablet.
    Safety and effectiveness in pediatric patients less than 12 months of age with asthma have not been established.
    There have been no clinical trials in patients with asthma to evaluate the relative efficacy of morning versus evening dosing. The pharmacokinetics of montelukast are similar whether dosed in the morning or evening. Efficacy has been demonstrated for asthma when montelukast was administered in the evening without regard to time of food ingestion.

    2.2 Exercise-lnduced Bronchoconstriction (EIB)

    For prevention of EIB,a single dose of montelukast sodium chewable tablet should be taken at least 2 hours before exercise.
    The following doses are recommended:
    For adults and adolescents 15 years of age and older: one 10-mg tablet.
    For pediatric patients 6 to 14 years of age: one 5-mg chewable tablet.
    An additional dose of montelukast sodium chewable tablets should not be taken within 24 hours of a previous dose. Patients already taking montelukast sodium chewable tablets daily for another indication (including chronic asthma) should not take an additional dose to prevent EIB. All patients should have available for rescue a short-acting β-agonist.Safety and efficacy in patients younger than 6 years of age have not been established. Daily administration of montelukast sodium chewable tablets for the chronic treatment of asthma has not been established to prevent acute episodes of EIB.

    2.3 Allergic Rhinitis

    For allergic rhinitis, montelukast sodium chewable tablets should be taken once daily. Efficacy was demonstrated for seasonal allergic rhinitis when montelukast was administered in the morning or the evening without regard to time of food ingestion. The time of administration may be individualized to suit patient needs.
    The following doses for the treatment of symptoms of seasonal allergic rhinitis are recommended:
    For adults and adolescents 15 years of age and older: one 10-mg tablet.
    For pediatric patients 6 to 14 years of age: one 5-mg chewable tablet.
    For pediatric patients 2 to 5 years of age: one 4-mg chewable tablet.
    Safety and effectiveness in pediatric patients younger than 2 years of age with seasonal allergic rhinitis have not been established. 
    The following doses for the treatment of symptoms of perennial allergic rhinitis are recommended:
    For adults and adolescents 15 years of age and older: one 10-mg tablet.
    For pediatric patients 6 to 14 years of age: one 5-mg chewable tablet.
    For pediatric patients 2 to 5 years of age: one 4-mg chewable tablet.
    Safety and effectiveness in pediatric patients younger than 6 months of age with perennial allergic rhinitis have not been established.

    2.4 Asthma and Allergic Rhinitis

    Patients with both asthma and allergic rhinitis should take only one montelukast sodium chewable tablets dose daily in the evening.

  • 3 DOSAGE FORMS & STRENGTHS

    Montelukast Sodium (equivalent to 4-mg montelukast) Chewable Tablets are light pink colored, speckled, oval, biconvex shaped, chewable tablets debossed with 'I' on one  side and '112' on the other side.
    Montelukast Sodium (equivalent to 5-mg montelukast) Chewable Tablets are light pink colored, speckled, round, biconvex shaped, chewable tablets debossed with 'I' on one side and '113' on the other side.

  • 4 CONTRAINDICATIONS

    Hypersensitivity to any component of this product.

  • 5 WARNINGS AND PRECAUTIONS

    5.1 Acute Asthma

    Montelukast sodium is not indicated for use in the reversal of bronchospasm in acute asthma attacks, including status asthmaticus.Patients should be advised to have appropriate rescue medication available.Therapy with montelukast sodium can be continued during acute exacerbations of asthma.Patients who have exacerbations of asthma after exercise should have available for rescue a short-acting inhaled β-agonist.

    5.2 Concomitant Corticosteroid Use

    While the dose of inhaled corticosteroid may be reduced gradually under medical supervision, Montelukast sodium should not be abruptly substituted for inhaled or oral corticosteroids.

    5.3 Aspirin Sensitivity

    Patients with known aspirin sensitivity should continue avoidance of aspirin or non-steroidal anti-inflammatory agents while taking montelukast sodium. Although montelukast sodium is effective in improving airway function in asthmatics with documented aspirin sensitivity, it has not been shown to truncate bronchoconstrictor response to aspirin and other non-steroidal anti-inflammatory drugs in aspirin-sensitive asthmatic patients [see Clinical Studies (14.1)].

    5.4 Neuropsychiatric Events

    Neuropsychiatric events have been reported in adult, adolescent, and pediatric patients taking montelukast sodium. Post-marketing reports with montelukast sodium use include agitation, aggressive behavior or hostility, anxiousness, depression, disorientation, disturbance in attention, dream abnormalities, hallucinations, insomnia, irritability, memory impairment, restlessness, somnambulism, suicidal thinking and behavior (including suicide), tic, and tremor. The clinical details of some post-marketing reports involving montelukast sodium appear consistent with a drug-induced effect.
    Patients and prescribers should be alert for neuropsychiatric events. Patients should be instructed to notify their prescriber if these changes occur. Prescribers should carefully evaluate the risks and benefits of continuing treatment with montelukast sodium if such events occur [see Adverse Reactions (6.2)].

    5.5 Eosinophilic Conditions

    Patients with asthma on therapy with montelukast sodium may present with systemic eosinophilia, sometimes presenting with clinical features of vasculitis consistent with Churg-Strauss syndrome, a condition which is often treated with systemic corticosteroid therapy. These events have been sometimes associated with the reduction of oral corticosteroid therapy. Physicians should be alert to eosinophilia, vasculitic rash, worsening pulmonary symptoms, cardiac complications, and/or neuropathy presenting in their patients. A causal association between montelukast sodium and these underlying conditions has not been established [see Adverse Reactions (6.2)].

    5.6Phenylketonuria

    Phenylketonuric patients should be informed that the 4-mg and 5-mg chewable tablets contain phenylalanine (a component of aspartame), 0.674 and 0.842 mg per 4-mg and 5-mg chewable tablet, respectively.

  • 6 ADVERSE REACTIONS

    6.1 Clinical Trials Experience

    Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice. In the following description of clinical trials experience, adverse reactions are listed regardless of causality assessment.
    The most common adverse reactions (incidence ≥5% and greater than placebo; listed in descending order of frequency) in controlled clinical trials were: upper respiratory infection, fever, headache, pharyngitis, cough, abdominal pain, diarrhea, otitis media, influenza, rhinorrhea, sinusitis, otitis.Adults and Adolescents 15 Years of Age and Older with Asthma
    Montelukast sodium has been evaluated for safety in approximately 2950 adult and adolescent patients 15 years of age and older in clinical trials. In placebo-controlled clinical trials, the following adverse experiences reported with montelukast sodium occurred in greater than or equal to 1% of patients and at an incidence greater than that in patients treated with placebo:Table 1: Adverse Experiences Occurring in ≥1% of Patients with an Incidence Greater than that in Patients Treated with Placebo

     

    Montelukast Sodium
    10 mg/day

    Placebo

    (%)

    (%)

    (n=1955)

    (n=1180)

    Body As A Whole

     

     

                 Pain, abdominal

    2.9

    2.5

                 Asthenia/fatigue

    1.8

    1.2

                 Fever

    1.5

    0.9

                 Trauma

    1

    0.8

    Digestive System Disorders

     

     

                 Dyspepsia

    2.1

    1.1

                 Pain, dental

    1.7

    1

                 Gastroenteritis, infectious

    1.5

    0.5

    Nervous System/Psychiatric

     

     

                  Headache

    18.4

    18.1

                  Dizziness

    1.9

    1.4

    Respiratory System Disorders

     

     

                  Influenza

    4.2

    3.9

                  Cough

    2.7

    2.4

                  Congestion, nasal

    1.6

    1.3

     
    Skin/Skin Appendages Disorder

     

     

                  Rash

    1.6

    1.2

    Laboratory Adverse Experiences*

     

     

                   ALT increased

    2.1

    2

                   AST increased

    1.6

    1.2

                   Pyuria

    1

    0.9

    *Number of patients tested (montelukast sodium and placebo, respectively): ALT and AST, 1935, 1170; pyuria, 1924, 1159.

    The frequency of less common adverse events was comparable between montelukast sodium and placebo.
    The safety profile of montelukast sodium,when administered as a single dose for prevention of EIB in adult and adolescent patients 15 years of age and older, was consistent with the safety profile previously described for montelukast sodium.
    Cumulatively, 569 patients were treated with montelukast sodium for at least 6 months, 480 for one year, and 49 for two years in clinical trials. With prolonged treatment, the adverse experience profile did not significantly change.
    Pediatric Patients 6 to 14 Years of Age with Asthma
    Montelukast sodium has been evaluated for safety in 476 pediatric patients 6 to 14 years of age. Cumulatively, 289 pediatric patients were treated with montelukast sodium for at least 6 months, and 241 for one year or longer in clinical trials. The safety profile of montelukast sodium in the 8-week, double-blind, pediatric efficacy trial was generally similar to the adult safety profile. In pediatric patients 6 to 14 years of age receiving montelukast sodium, the following events occurred with a frequency ≥2% and more frequently than in pediatric patients who received placebo: pharyngitis, influenza, fever, sinusitis, nausea, diarrhea, dyspepsia, otitis, viral infection, and laryngitis. The frequency of less common adverse events was comparable between montelukast sodium and placebo. With prolonged treatment, the adverse experience profile did not significantly change.
    The safety profile of montelukast sodium, when administered as a single dose for prevention of EIB in pediatric patients 6 years of age and older, was consistent with the safety profile previously described for montelukast sodium.
    In studies evaluating growth rate, the safety profile in these pediatric patients was consistent with the safety profile previously described for montelukast sodium. In a 56-week, double-blind study evaluating growth rate in pediatric patients 6 to 8 years of age receiving montelukast sodium, the following events not previously observed with the use of montelukast sodium in this age group occurred with a frequency ≥2% and more frequently than in pediatric patients who received placebo: headache, rhinitis (infective), varicella, gastroenteritis, atopic dermatitis, acute bronchitis, tooth infection, skin infection, and myopia.
    Pediatric Patients 2 to 5 Years of Age with Asthma
    Montelukast sodium has been evaluated for safety in 573 pediatric patients 2 to 5 years of age in single- and multiple-dose studies. Cumulatively, 426 pediatric patients 2 to 5 years of age were treated with montelukast sodium for at least 3 months, 230 for 6 months or longer, and 63 patients for one year or longer in clinical trials. In pediatric patients 2 to 5 years of age receiving montelukast sodium, the following events occurred with a frequency ≥2% and more frequently than in pediatric patients who received placebo: fever, cough, abdominal pain, diarrhea, headache, rhinorrhea, sinusitis, otitis, influenza, rash, ear pain, gastroenteritis, eczema, urticaria, varicella, pneumonia, dermatitis, and conjunctivitis.
    Adults and Adolescents 15 Years of Age and Older with Seasonal Allergic Rhinitis
    Montelukast sodium has been evaluated for safety in 2199 adult and adolescent patients 15 years of age and older in clinical trials. Montelukast sodium administered once daily in the morning or in the evening had a safety profile similar to that of placebo. In placebo-controlled clinical trials, the following event was reported with montelukast sodium with a frequency ≥1% and at an incidence greater than placebo: upper respiratory infection, 1.9% of patients receiving montelukast sodium vs. 1.5% of patients receiving placebo. In a 4-week, placebo-controlled clinical study, the safety profile was consistent with that observed in 2-week studies. The incidence of somnolence was similar to that of placebo in all studies.
    Pediatric Patients 2 to 14 Years of Age with Seasonal Allergic Rhinitis
    Montelukast sodium have been evaluated in 280 pediatric patients  2 to 14 years of age in a 2-week, multicenter, double-blind, placebo-controlled, parallel-group safety study. Montelukast sodium administered once daily in the evening had a safety profile similar to that of placebo. In this study, the following events occurred with a frequency ≥2% and at an incidence greater than placebo: headache, otitis media, pharyngitis, and upper respiratory infection.
    Adults and Adolescents 15 Years of Age and Older with Perennial Allergic Rhinitis
    Montelukast sodium has been evaluated for safety in 3357 adult and adolescent patients 15 years of age and older with perennial allergic rhinitis of whom 1632 received montelukast sodium in two, 6-week, clinical studies. Montelukast sodium administered once daily had a safety profile consistent with that observed in patients with seasonal allergic rhinitis and similar to that of placebo. In these two studies, the following events were reported with montelukast sodium with a frequency ≥1% and at an incidence greater than placebo: sinusitis, upper respiratory infection, sinus headache, cough, epistaxis, and increased ALT. The incidence of somnolence was similar to that of placebo.
    Pediatric Patients 6 Months to 14 Years of Age with Perennial Allergic Rhinitis
    The safety in patients 2 to 14 years of age with perennial allergic rhinitis is supported by the safety in patients 2 to 14 years of age with seasonal allergic rhinitis.

    6.2 Post-Marketing Experience

    The following adverse reactions have been identified during post-approval use of montelukast sodium. 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.
    Blood and lymphatic system disorders: increased bleeding tendency, thrombocytopenia.
    Immune system disorders: hypersensitivity reactions including anaphylaxis, hepatic eosinophilic infiltration.
    Psychiatric disorders: agitation including aggressive behavior or hostility, anxiousness, depression, disorientation, disturbance in attention, dream abnormalities, hallucinations, insomnia, irritability, memory impairment, restlessness, somnambulism, suicidal thinking and behavior (including suicide), tic, and tremor [see Warnings and Precautions (5.4)].
    Nervous system disorders: drowsiness, paraesthesia/hypoesthesia, seizures.
    Cardiac disorders: palpitations.
    Respiratory, thoracic and mediastinal disorders: epistaxis, pulmonary eosinophilia.
    Gastrointestinal disorders: diarrhea, dyspepsia, nausea, pancreatitis, vomiting.
    Hepatobiliary disorders: Cases of cholestatic hepatitis, hepatocellular liver-injury, and mixed-pattern liver injury have been reported in patients treated with montelukast sodium. Most of these occurred in combination with other confounding factors, such as use of other medications, or when montelukast sodium was administered to patients who had underlying potential for liver disease such as alcohol use or other forms of hepatitis.
    Skin and subcutaneous tissue disorders: angioedema, bruising, erythema multiforme, erythema nodosum, pruritus, Stevens-Johnson syndrome/toxic epidermal necrolysis,  urticaria.
    Musculoskeletal and connective tissue disorders: arthralgia, myalgia including muscle cramps.
    Renal and urinary disorders: enuresis in children.
    General disorders and administration site conditions: edema.
    Patients with asthma on therapy with montelukast sodium may present with systemic eosinophilia, sometimes presenting with clinical features of vasculitis consistent with Churg-Strauss syndrome, a condition which is often treated with systemic corticosteroid therapy. These events have been sometimes associated with the reduction of oral corticosteroid therapy. Physicians should be alert to eosinophilia, vasculitic rash, worsening pulmonary symptoms, cardiac complications, and/or neuropathy presenting in their patients [see Warnings and Precautions (5.5)].

  • 7 DRUG INTERACTIONS

    No dose adjustment is needed when montelukast sodium is co-administered with theophylline, prednisone, prednisolone, oral contraceptives, terfenadine, digoxin, warfarin, gemfibrozil, itraconazole, thyroid hormones, sedative hypnotics, non-steroidal anti-inflammatory agents, benzodiazepines, decongestants, and Cytochrome P450 (CYP) enzyme inducers [see Clinical Pharmacology (12.3)].

  • 8 USE IN SPECIFIC POPULATIONS

    8.1 Pregnancy

    Pregnancy Category B: There are no adequate and well-controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, montelukast sodium should be used during pregnancy only if clearly needed.
    Teratogenic Effect: No teratogenicity was observed in rats and rabbits at doses approximately 100 and 110 times, respectively, the maximum recommended daily oral dose in adults based on AUCs [see Nonclinical Toxicology (13.2)].
    During worldwide marketing experience, congenital limb defects have been rarely reported in the offspring of women being treated with montelukast sodium during pregnancy. Most of these women were also taking other asthma medications during their pregnancy. A causal relationship between these events and montelukast sodium has not been established.

    8.3 Nursing Mothers

    Studies in rats have shown that montelukast is excreted in milk. It is not known if montelukast is excreted in human milk.Because many drugs are excreted in human milk, caution should be exercised when montelukast sodium is given to a nursing mother.

    8.4 Pediatric Use

    Safety and efficacy of montelukast sodium have been established in adequate and well-controlled studies in pediatric patients with asthma 6 to 14 years of age. Safety and efficacy profiles in this age group are similar to those seen in adults [see Adverse Reactions (6.1), Clinical Pharmacology, Special Populations (12.3), and Clinical Studies (14.1, 14.2)].
    The efficacy of montelukast sodium for the treatment of seasonal allergic rhinitis in pediatric patients 2 to 14 years of age and for the treatment of perennial allergic rhinitis in pediatric patients 6 months to 14 years of age is supported by extrapolation from the demonstrated efficacy in patients 15 years of age and older with allergic rhinitis as well as the assumption that the disease course, pathophysiology and the drug’s effect are substantially similar among these populations.
    The safety of montelukast sodium 4-mg chewable tablets in pediatric patients 2 to 5 years of age with asthma has been demonstrated by adequate and well-controlled data [see Adverse Reactions (6.1)]. Efficacy of montelukast sodium in this age group is extrapolated from the demonstrated efficacy in patients 6 years of age and older with asthma and is based on similar pharmacokinetic data, as well as the assumption that the disease course, pathophysiology and the drug’s effect are substantially similar among these populations. Efficacy in this age group is supported by exploratory efficacy assessments from a large, well-controlled safety study conducted in patients 2 to 5 years of age.
    The safety of montelukast sodium sodium 4-mg and 5-mg chewable tablets in pediatric patients aged 2 to 14 years with allergic rhinitis is supported by data from studies conducted in pediatric patients aged 2 to 14 years with asthma. A safety study in pediatric patients 2 to 14 years of age with seasonal allergic rhinitis demonstrated a similar safety profile [see Adverse Reactions (6.1)].
    The safety and effectiveness in pediatric patients below the age of 12 months with asthma, 6 months with perennial allergic rhinitis, and 6 years with exercise-induced bronchoconstriction have not been established.
    Growth Rate in Pediatric Patients
    A 56-week, multi-center, double-blind, randomized, active- and placebo-controlled parallel group study was conducted to assess the effect of montelukast sodium on growth rate in 360 patients with mild asthma, aged 6 to 8 years. Treatment groups included montelukast sodium 5 mg once daily, placebo, and beclomethasone dipropionate administered as 168 mcg twice daily with a spacer device. For each subject, a growth rate was defined as the slope of a linear regression line fit to the height measurements over 56 weeks. The primary comparison was the difference in growth rates between montelukast sodium and placebo groups. Growth rates, expressed as least-squares (LS) mean (95% CI) in cm/year, for the montelukast sodium, placebo, and beclomethasone treatment groups were 5.67 (5.46, 5.88), 5.64 (5.42, 5.86), and 4.86 (4.64, 5.08), respectively. The differences in growth rates, expressed as least-squares (LS) mean (95% CI) in cm/year, for montelukast sodium minus placebo, beclomethasone minus placebo, and montelukast sodium minus  beclomethasone treatment groups were 0.03 (-0.26, 0.31), -0.78 (-1.06, -0.49); and 0.81 (0.53, 1.09), respectively. Growth rate (expressed as mean change in height over time) for each treatment group is shown in FIGURE 1.
    Figure 1: Change in Height (cm) from Randomization Visit by Scheduled Week (Treatment Group Mean ± Standard Error* of the Mean)
    Figure1
    *The standard errors of the treatment group means in change in height are too small  to be visible on the plot 

    8.5 Geriatric Use

    Of the total number of subjects in clinical studies of montelukast, 3.5% were 65 years of age and over, and 0.4% were 75 years of age and over. No overall differences in safety or effectiveness were observed between these subjects and younger subjects, and other reported clinical experience has not identified differences in responses between the elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out. The pharmacokinetic profile and the oral bioavailability of a single 10-mg oral dose of montelukast are similar in elderly and younger adults. The plasma half-life of montelukast is slightly longer in the elderly. No dosage adjustment in the elderly is required.

    8.6 Hepatic Insufficiency

    No dosage adjustment is required in patients with mild-to-moderate hepatic insufficiency [see Clinical Pharmacology (12.3)].

    8.7 Renal Insufficiency

    No dosage adjustment is recommended in patients with renal insufficiency [see Clinical Pharmacology (12.3)].

  • 10 OVERDOSAGE

    No specific information is available on the treatment of overdosage with montelukast sodium. In chronic asthma studies, montelukast has been administered at doses up to 200 mg/day to adult patients for 22 weeks and, in short-term studies, up to 900 mg/day to patients for approximately a week without clinically important adverse experiences. In the event of overdose, it is reasonable to employ the usual supportive measures; e.g., remove unabsorbed material from the gastrointestinal tract, employ clinical monitoring, and institute supportive therapy, if required.
    There have been reports of acute overdosage in post-marketing experience and clinical studies with montelukast sodium. These include reports in adults and children with a dose as high as 1000 mg. The clinical and laboratory findings observed were consistent with the safety profile in adults and pediatric patients. There were no adverse experiences in the majority of overdosage reports. The most frequently occurring adverse experiences were consistent with the safety profile of montelukast sodium and included abdominal pain, somnolence, thirst, headache, vomiting and psychomotor hyperactivity.
    It is not known whether montelukast is removed by peritoneal dialysis or hemodialysis.

  • 11 DESCRIPTION

    Montelukast sodium, USP the active ingredient in montelukast sodium chewable tablets, is a selective and orally active leukotriene receptor antagonist that inhibits the cysteinyl leukotriene CysLT1 receptor.
    Montelukast sodium, USP is described chemically as 1-[[[(1R)-1-[3-[(1E)-2-(7-Chloro-2-quinolinyl) ethenyl] phenyl]-3-[2- (1-hydroxy-1-methylethyl) phenyl] propyl] thio] methyl] cyclopropane acetic acid, sodium salt.
    The empirical formula is C35H35ClNNaO3S, and its molecular weight is 608.17. The structural formula is:

    structure

    Montelukast sodium, USP is a hygroscopic, optically active, white or almost white colored powder. Montelukast sodium, USP is freely soluble in water and in methylene chloride, freely soluble to very soluble in alcohol.
    Each 4-mg and 5-mg chewable montelukast sodium tablets contain 4.16 and 5.2 mg montelukast sodium, respectively, which are equivalent to 4-mg and 5-mg of montelukast, respectively. Both chewable tablets contain the following inactive ingredients: art cherry flavor, aspartame, croscarmellose sodium, ferric oxide red, hydroxypropyl cellulose, magnesium stearate, mannitol and microcrystalline cellulose.

  • 12 CLINICAL PHARMACOLOGY

    12.1 Mechanism of Action

    The cysteinyl leukotrienes (LTC4, LTD4, LTE4) are products of arachidonic acid metabolism and are released from various cells, including mast cells and eosinophils. These eicosanoids bind to cysteinyl leukotriene (CysLT) receptors. The CysLT type-1 (CysLT1) receptor is found in the human airway (including airway smooth muscle cells and airway macrophages) and on other pro-inflammatory cells (including eosinophils and certain myeloid stem cells). CysLTs have been correlated with the pathophysiology of asthma and allergic rhinitis. In asthma, leukotriene-mediated effects include airway edema, smooth muscle contraction, and altered cellular activity associated with the inflammatory process. In allergic rhinitis, CysLTs are released from the nasal mucosa after allergen exposure during both early- and late-phase reactions and are associated with symptoms of allergic rhinitis.
    Montelukast is an orally active compound that binds with high affinity and selectivity to the CysLT1 receptor (in preference to other pharmacologically important airway receptors, such as the prostanoid, cholinergic, or β-adrenergic receptor). Montelukast inhibits physiologic actions of LTD4 at the CysLT1 receptor without any agonist activity.

    12.2 Pharmacodynamics

    Montelukast causes inhibition of airway cysteinyl leukotriene receptors as demonstrated by the ability to inhibit bronchoconstriction due to inhaled LTD4 in asthmatics. Doses as low as 5 mg cause substantial blockage of LTD4-induced bronchoconstriction. In a placebo-controlled, crossover study (n=12), montelukast sodium inhibited early- and late-phase bronchoconstriction due to antigen challenge by 75% and 57%, respectively.
    The effect of montelukast sodium on eosinophils in the peripheral blood was examined in clinical trials. In patients with asthma aged 2 years and older who received montelukast sodium, a decrease in mean peripheral blood eosinophil counts ranging from 9% to 15% was noted, compared with placebo, over the double-blind treatment periods. In patients with seasonal allergic rhinitis aged 15 years and older who received montelukast sodium, a mean increase of 0.2% in peripheral blood eosinophil counts was noted, compared with a mean increase of 12.5% in placebo-treated patients, over the double-blind treatment periods; this reflects a mean difference of 12.3% in favor of montelukast sodium. The relationship between these observations and the clinical benefits of montelukast noted in the clinical trials is not known [see Clinical Studies (14)].

    12.3 Pharmacokinetics

    Absorption
    Montelukast is rapidly absorbed following oral administration. After administration of the 10-mg film-coated tablet to fasted adults, the mean peak montelukast plasma concentration (Cmax) is achieved in 3 to 4 hours (Tmax). The mean oral bioavailability is 64%. The oral bioavailability and Cmax are not influenced by a standard meal in the morning.
    For the 5-mg chewable tablet, the mean Cmax is achieved in 2 to 2.5 hours after administration to adults in the fasted state. The mean oral bioavailability is 73% in the fasted state versus 63% when administered with a standard meal in the morning.
    For the 4-mg chewable tablet, the mean Cmax is achieved 2 hours after administration in pediatric patients 2 to 5 years of age in the fasted state.
    The 4-mg oral granule formulation is bioequivalent to the 4-mg chewable tablet when administered to adults in the fasted state.
    The safety and efficacy of montelukast sodium in patients with asthma were demonstrated in clinical trials in which the 10-mg film-coated tablet and 5-mg chewable tablet formulations were administered in the evening without regard to the time of food ingestion. The safety of montelukast sodium in patients with asthma was also demonstrated in clinical trials in which the 4-mg chewable tablet formulations were administered in the evening without regard to the time of food ingestion. The safety and efficacy of montelukast sodium in patients with seasonal allergic rhinitis were demonstrated in clinical trials in which the 10-mg film-coated tablet was administered in the morning or evening without regard to the time of food ingestion.
    The comparative pharmacokinetics of montelukast when administered as two 5-mg chewable tablets versus one 10-mg film-coated tablet have not been evaluated.
    Distribution
    Montelukast is more than 99% bound to plasma proteins. The steady state volume of distribution of montelukast averages 8 to 11 liters. Studies in rats with radiolabeled montelukast indicate minimal distribution across the blood-brain barrier. In addition, concentrations of radiolabeled material at 24 hours postdose were minimal in all other tissues.
    Metabolism
    Montelukast is extensively metabolized. In studies with therapeutic doses, plasma concentrations of metabolites of montelukast are undetectable at steady state in adults and pediatric patients.
    In vitro studies using human liver microsomes indicate that CYP3A4, 2C8, and 2C9 are involved in the metabolism of montelukast. At clinically relevant concentrations, 2C8 appears to play a major role in the metabolism of montelukast. 
    Elimination
    The plasma clearance of montelukast averages 45 mL/min in healthy adults. Following an oral dose of radiolabeled montelukast, 86% of the radioactivity was recovered in 5-day fecal collections and <0.2% was recovered in urine. Coupled with estimates of montelukast oral bioavailability, this indicates that montelukast and its metabolites are excreted almost exclusively via the bile.
    In several studies, the mean plasma half-life of montelukast ranged from 2.7 to 5.5 hours in healthy young adults. The pharmacokinetics of montelukast are nearly linear for oral doses up to 50 mg. During once-daily dosing with 10-mg montelukast, there is little accumulation of the parent drug in plasma (14%).
    Special Populations
    Hepatic Insufficiency: Patients with mild-to-moderate hepatic insufficiency and clinical evidence of cirrhosis had evidence of decreased metabolism of montelukast resulting in 41 % (90% CI=7%, 85%) higher mean montelukast AUC following a single 10-mg dose. The elimination of montelukast was slightly prolonged compared with that in healthy subjects (mean half-life, 7.4 hours). No dosage adjustment is required in patients with mild-to-moderate hepatic insufficiency. The pharmacokinetics of montelukast sodium in patients with more severe hepatic impairment or with hepatitis have not been evaluated.
    Renal Insufficiency: Since montelukast and its metabolites are not excreted in the urine, the pharmacokinetics of montelukast were not evaluated in patients with renal insufficiency. No dosage adjustment is recommended in these patients.
    Gender: The pharmacokinetics of montelukast are similar in males and females.
    Race: Pharmacokinetic differences due to race have not been studied.
    Adolescents and Pediatric Patients: Pharmacokinetic studies evaluated the systemic exposure of the 4-mg chewable tablets in pediatric patients 2 to 5 years of age, the 5-mg chewable tablets in pediatric patients 6 to 14 years of age, and the 10-mg film-coated tablets in young adults and adolescents > 15 years of age.  
    The plasma concentration profile of montelukast following administration of the 10-mg film-coated tablet is similar in adolescents ≥15 years of age and young adults. The 10-mg film-coated tablet is recommended for use in patients ≥15 years of age.
    The mean systemic exposure of the 4-mg chewable tablet in pediatric patients 2 to 5 years of age and the 5-mg chewable tablets in pediatric patients 6 to 14 years of age is similar to the mean systemic exposure of the 10-mg film-coated tablet in adults. The 5-mg chewable tablet should be used in pediatric patients 6 to 14 years of age and the 4-mg chewable tablet should be used in pediatric patients 2 to 5 years of age.
    In children 6 to 11 months of age, the systemic exposure to montelukast and the variability of plasma montelukast concentrations were higher than those observed in adults. Based on population analyses, the mean AUC (4296 nghr/mL [range 1200 to 7153]) was 60% higher and the mean Cmax (667 ng/mL [range 201 to 1058]) was 89% higher than those observed in adults (mean AUC 2689 nghr/mL [range 1521 to 4595]) and mean Cmax (353 ng/mL [range 180 to 548]). The systemic exposure in children 12 to 23 months of age was less variable, but was still higher than that observed in adults. The mean AUC (3574 nghr/mL [range 2229 to 5408]) was 33% higher and the mean Cmax (562 ng/mL [range 296 to 814]) was 60% higher than those observed in adults. Safety and tolerability of montelukast in a single-dose pharmacokinetic study in 26 children 6 to 23 months of age were similar to that of patients two years and above [see Adverse Reactions (6.1)]. The 4-mg oral granule formulation should be used for pediatric patients 12 to 23 months of age for the treatment of asthma, or for pediatric patients 6 to 23 months of age for the treatment of perennial allergic rhinitis. Since the 4-mg oral granule formulation is bioequivalent to the 4-mg chewable tablet, it can also be used as an alternative formulation to the 4-mg chewable tablet in pediatric patients 2 to 5 years of age.
    Drug-Drug Interactions
    Theophylline, Prednisone, and Prednisolone: Montelukast sodium has been administered with other therapies routinely used in the prophylaxis and chronic treatment of asthma with no apparent increase in adverse reactions. In drug-interaction studies, the recommended clinical dose of montelukast did not have clinically important effects on the pharmacokinetics of the following drugs: theophylline, prednisone, and prednisolone.
    Montelukast at a dose of 10 mg once daily dosed to pharmacokinetic steady state, did not cause clinically significant changes in the kinetics of a single intravenous dose of theophylline [predominantly a cytochrome P450 (CYP) 1A2 substrate]. Montelukast at doses of ≥100 mg daily dosed to pharmacokinetic steady state, did not cause any clinically significant change in plasma profiles of prednisone or prednisolone following administration of either oral prednisone or intravenous prednisolone.
    Oral Contraceptives, Terfenadine, Digoxin, and Warfarin: In drug interaction studies, the recommended clinical dose of montelukast did not have clinically important effects on the pharmacokinetics of the following drugs: oral contraceptives (norethindrone 1 mg/ethinyl estradiol 35 mcg), terfenadine, digoxin, and warfarin. Montelukast at doses of ≥100 mg daily dosed to pharmacokinetic steady state did not significantly alter the plasma concentrations of either component of an oral contraceptive containing norethindrone 1 mg/ethinyl estradiol 35 mcg. Montelukast at a dose of 10 mg once daily dosed to pharmacokinetic steady state did not change the plasma concentration profile of terfenadine (a substrate of CYP3A4) or fexofenadine, the carboxylated metabolite, and did not prolong the QTc interval following co-administration with terfenadine 60 mg twice daily; did not change the pharmacokinetic profile or urinary excretion of immunoreactive digoxin; did not change the pharmacokinetic profile of warfarin (primarily a substrate of CYP2C9, 3A4 and 1A2) or influence the effect of a single 30-mg oral dose of warfarin on prothrombin time or the International Normalized Ratio (INR).
    Thyroid Hormones, Sedative Hypnotics, Non-Steroidal Anti-Inflammatory Agents, Benzodiazepines, and Decongestants: Although additional specific interaction studies were not performed, montelukast sodium was used concomitantly with a wide range of commonly prescribed drugs in clinical studies without evidence of clinical adverse interactions. These medications included thyroid hormones, sedative hypnotics, non-steroidal anti-inflammatory agents, benzodiazepines, and decongestants.
    Cytochrome P450 (CYP) Enzyme Inducers: Phenobarbital, which induces hepatic metabolism, decreased the area under the plasma concentration curve (AUC) of montelukast approximately 40% following a single 10-mg dose of montelukast. No dosage adjustment for montelukast sodium is recommended. It is reasonable to employ appropriate clinical monitoring when potent CYP enzyme inducers, such as phenobarbital or rifampin, are co-administered with montelukast sodium tablets.
    Effect of Montelukast on Cytochrome P450 (CYP) Enzymes: Montelukast is a potent inhibitor of CYP2C8 in vitro. However, data from a clinical drug-drug interaction study involving montelukast and rosiglitazone (a probe substrate representative of drugs primarily metabolized by CYP2C8) in 12 healthy individuals demonstrated that the pharmacokinetics of rosiglitazone are not altered when the drugs are coadministered, indicating that montelukast does not inhibit CYP2C8 in vivo. Therefore, montelukast is not anticipated to alter the metabolism of drugs metabolized by this enzyme (e.g., paclitaxel, rosiglitazone, and repaglinide). Based on further in vitro results in human liver microsomes, therapeutic plasma concentrations of montelukast do not inhibit CYP 3A4, 2C9, 1A2, 2A6, 2C19, or 2D6.
    Cytochrome P450 (CYP) Enzyme Inhibitors:In vitro studies have shown that montelukast is a substrate of CYP 2C8, 2C9, and 3A4. Co-administration of montelukast with itraconazole, a strong CYP 3A4 inhibitor, resulted in no significant increase in the systemic exposure of montelukast. Data from a clinical drug-drug interaction study involving montelukast and gemfibrozil (an inhibitor of both CYP 2C8 and 2C9) demonstrated that gemfibrozil, at a therapeutic dose, increased the systemic exposure of montelukast by 4.4-fold. Co-administration of itraconazole, gemfibrozil, and montelukast did not further increase the systemic exposure of montelukast. Based on available clinical experience, no dosage adjustment of montelukast is required upon co-administration with gemfibrozil [see Overdosage (10)].

  • 13 NONCLINICAL TOXICOLOGY

    13.1 Carcinogenesis & Mutagenesis & Impairment Of Fertility

    No evidence of tumorigenicity was seen in carcinogenicity studies of either 2 years in Sprague-Dawley rats or 92 weeks in mice at oral gavage doses up to 200 mg/kg/day or 100 mg/kg/day, respectively. The estimated exposure in rats was approximately 120 and 75 times the AUC for adults and children, respectively, at the maximum recommended daily oral dose. The estimated exposure in mice was approximately 45 and 25 times the AUC for adults and children, respectively, at the maximum recommended daily oral dose.
    Montelukast demonstrated no evidence of mutagenic or clastogenic activity in the following assays: the microbial mutagenesis assay, the V-79 mammalian cell mutagenesis assay, the alkaline elution assay in rat hepatocytes, the chromosomal aberration assay in Chinese hamster ovary cells, and in the in vivo mouse bone marrow chromosomal aberration assay.
    In fertility studies in female rats, montelukast produced reductions in fertility and fecundity indices at an oral dose of 200 mg/kg (estimated exposure was approximately 70 times the AUC for adults at the maximum recommended daily oral dose). No effects on female fertility or fecundity were observed at an oral dose of 100 mg/kg (estimated exposure was approximately 20 times the AUC for adults at the maximum recommended daily oral dose). Montelukast had no effects on fertility in male rats at oral doses up to 800 mg/kg (estimated exposure was approximately 160 times the AUC for adults at the maximum recommended daily oral dose).

    13.2 Animal Pharmacology & OR Toxicology

    Reproductive Toxicology Studies
    No teratogenicity was observed at oral doses up to 400 mg/kg/day and 300 mg/kg/day in rats and rabbits, respectively. These doses were approximately 100 and 110 times the maximum recommended daily oral dose in adults, respectively, based on AUCs. Montelukast crosses the placenta following oral dosing in rats and rabbits [see Pregnancy (8.1)].

  • 14 CLINICAL STUDIES

    14.1 Asthma

    Adults and Adolescents 15 Years of Age and Older with Asthma
    Clinical trials in adults and adolescents 15 years of age and older demonstrated there is no additional clinical benefit to montelukast doses above 10 mg once daily.
    The efficacy of montelukast sodium for the chronic treatment of asthma in adults and adolescents 15 years of age and older was demonstrated in two (U.S. and Multinational) similarly designed, randomized, 12-week, double-blind, placebo-controlled trials in 1576 patients (795 treated with montelukast sodium, 530 treated with placebo, and 251 treated with active control). The median age was 33 years (range 15 to 85); 56.8% were females and 43.2% were males. The ethnic/racial distribution in these studies was 71.6% Caucasian, 17.7% Hispanic, 7.2% other origins and 3.5% Black. Patients had mild or moderate asthma and were non-smokers who required approximately 5 puffs of inhaled β-agonist per day on an "as-needed" basis. The patients had a mean baseline percent of predicted forced expiratory volume in 1 second (FEV1) of 66% (approximate range, 40 to 90%). The co-primary endpoints in these trials were FEV1 and daytime asthma symptoms. In both studies after 12 weeks, a random subset of patients receiving montelukast sodium was switched to placebo for an additional 3 weeks of double-blind treatment to evaluate for possible rebound effects.
    The results of the U.S. trial on the primary endpoint, morning FEV1, expressed as mean percent change from baseline averaged over the 12-week treatment period, are shown in FIGURE 2. Compared with placebo, treatment with one montelukast sodium 10-mg tablet daily in the evening resulted in a statistically significant increase in FEV1 percent change from baseline (13%-change in the group treated with montelukast sodium vs. 4.2%-change in the placebo group, p<0.001); the change from baseline in FEV1 for montelukast sodium was 0.32 liters compared with 0.10 liters for placebo, corresponding to a between-group difference of 0.22 liters (p<0.001, 95% CI 0.17 liters, 0.27 liters). The results of the Multinational trial on FEV1 were similar.
    Figure 2: FEV1 Mean Percent Change from Baseline (U.S. Trial: Montelukast Sodium N=406; Placebo N=270) (ANOVA Model)

    figure2

    The effect of montelukast sodium on other primary and secondary endpoints, represented by the Multinational study is shown in TABLE 2. Results on these endpoints were similar in the US study.
    Table 2: Effect of Montelukast Sodium on Primary and Secondary Endpoints in a Multinational Placebo-controlled Trial (ANOVA Model)

     

    Montelukast sodium

    Placebo

    Endpoint

    N

    Baseline

    Mean change from Baseline

    N

    Baseline

    Mean change from Baseline

    Daytime Asthma symptoms(0 to 6 scale)

    372

    2.35

    -0.49*

    245

    2.4

    -0.26

    β-agonist(puffs per day)

    371

    5.35

    -1.65*

    241

    5.78

    -0.42

    AM PEFR(L/min)

    372

    339.57

    25.03*

    244

    335.24

    1.83

    PM PEFR(L/min)

    372

    355.23

    20.13*

    244

    354.02

    -0.49

    Nocturnal Awakenings(#/week)

    285

    5.46

    -2.03*

    195

    5.57

    -0.78

    Both studies evaluated the effect of montelukast sodium on secondary outcomes, including asthma attack (utilization of health-care resources such as an unscheduled visit to a doctor's office, emergency room, or hospital; or treatment with oral, intravenous, or intramuscular corticosteroid), and use of oral corticosteroids for asthma rescue. In the Multinational study, significantly fewer patients (15.6% of patients) on montelukast sodium experienced asthma attacks compared with patients on placebo (27.3%,p < 0.001). In the US study,7.8% of patients on montelukast sodium and 10.3% of patients on placebo experienced asthma attacks, but the difference between the two treatment groups was not significant (p = 0.334). In the Multinational study, significantly fewer patients (14.8% of patients) on montelukast sodium were prescribed oral corticosteroids for asthma rescue compared with patients on placebo (25.7%, p < 0.001). In the US study, 6.9% of patients on montelukast sodium and 9.9% of patients on placebo were prescribed oral corticosteroids for asthma rescue, but the difference between the two treatment groups was not significant (p = 0.196).
    Onset of Action and Maintenance of Effects
    In each placebo-controlled trial in adults, the treatment effect of montelukast sodium, measured by daily diary card parameters, including symptom scores, "as-needed" β-agonist use, and PEFR measurements, was achieved after the first dose and was maintained throughout the dosing interval (24 hours). No significant change in treatment effect was observed during continuous once-daily evening administration in non-placebo-controlled extension trials for up to one year. Withdrawal of montelukast sodium in asthmatic patients after 12 weeks of continuous use did not cause rebound worsening of asthma.
    Pediatric Patients 6 to 14 Years of Age with Asthma
    The efficacy of montelukast sodium in pediatric patients 6 to 14 years of age was demonstrated in one 8-week, double-blind, placebo-controlled trial in 336 patients (201 treated with montelukast sodium and 135 treated with placebo) using an inhaled β-agonist on an "as-needed" basis. The patients had a mean baseline percent predicted FEV1 of 72% (approximate range, 45 to 90%) and a mean daily inhaled β-agonist requirement of 3.4 puffs of albuterol. Approximately 36% of the patients were on inhaled corticosteroids. The median age was 11 years (range 6 to 15); 35.4% were females and 64.6% were males. The ethnic/racial distribution in this study was 80.1% Caucasian, 12.8% Black, 4.5% Hispanic, and 2.7% other origins.
    Compared with placebo, treatment with one 5-mg montelukast sodium chewable tablets daily resulted in a significant improvement in mean morning FEV1 percent change from baseline (8.7% in the group treated with montelukast sodium vs. 4.2% change from baseline in the placebo group, p<0.001). There was a significant decrease in the mean percentage change in daily "as-needed" inhaled β-agonist use (11.7% decrease from baseline in the group treated with montelukast sodium vs. 8.2% increase from baseline in the placebo group, p<0.05). This effect represents a mean decrease from baseline of 0.56 and 0.23 puffs per day for the montelukast and placebo groups, respectively. Subgroup analyses indicated that younger pediatric patients aged 6 to 11 had efficacy results comparable to those of the older pediatric patients aged 12 to 14.
    Similar to the adult studies, no significant change in the treatment effect was observed during continuous once-daily administration in one open-label extension trial without a concurrent placebo group for up to 6 months.
    Pediatric Patients 2 to 5 Years of Age with Asthma
    The efficacy of montelukast sodium for the chronic treatment of asthma in pediatric patients 2 to 5 years of age was explored in a 12-week, placebo-controlled safety and tolerability study in 689 patients, 461 of whom were treated with montelukast sodium. The median age was 4 years (range 2 to 6); 41.5% were females and 58.5% were males. The ethnic/racial distribution in this study was 56.5% Caucasian, 20.9% Hispanic, 14.4% other origins, and 8.3% Black.
    While the primary objective was to determine the safety and tolerability of montelukast sodium in this age group, the study included exploratory efficacy evaluations, including daytime and overnight asthma symptom scores, β-agonist use, oral corticosteroid rescue, and the physician's global evaluation. The findings of these exploratory efficacy evaluations, along with pharmacokinetics and extrapolation of efficacy data from older patients, support the overall conclusion that montelukast sodium is efficacious in the maintenance treatment of asthma in patients 2 to 5 years of age.
    Effects in Patients on Concomitant Inhaled Corticosteroids
    Separate trials in adults evaluated the ability of montelukast sodium to add to the clinical effect of inhaled corticosteroids and to allow inhaled corticosteroid tapering when used concomitantly.
    One randomized, placebo-controlled, parallel-group trial (n=226) enrolled adults with stable asthma with a mean FEV1 of approximately 84% of predicted who were previously maintained on various inhaled corticosteroids (delivered by metered-dose aerosol or dry powder inhalers). The median age was 41.5 years (range 16 to 70); 52.2% were females and 47.8% were males. The ethnic/racial distribution in this study was 92% Caucasian, 3.5% Black, 2.2% Hispanic, and 2.2% Asian. The types of inhaled corticosteroids and their mean baseline requirements included beclomethasone dipropionate (mean dose, 1203 mcg/day), triamcinolone acetonide (mean dose, 2004 mcg/day), flunisolide (mean dose, 1971 mcg/day), fluticasone propionate (mean dose, 1083 mcg/day), or budesonide (mean dose, 1192 mcg/day). Some of these inhaled corticosteroids were non-U.S.-approved formulations, and doses expressed may not be ex-actuator. The pre-study inhaled corticosteroid requirements were reduced by approximately 37% during a 5- to 7-week placebo run-in period designed to titrate patients toward their lowest effective inhaled corticosteroid dose. Treatment with montelukast sodium resulted in a further 47% reduction in mean inhaled corticosteroid dose compared with a mean reduction of 30% in the placebo group over the 12-week active treatment period (p≤0.05). It is not known whether the results of this study can be generalized to patients with asthma who require higher doses of inhaled corticosteroids or systemic corticosteroids.
    In another randomized, placebo-controlled, parallel-group trial (n=642) in a similar population of adult patients previously maintained, but not adequately controlled, on inhaled corticosteroids (beclomethasone 336 mcg/day), the addition of montelukast sodium to beclomethasone resulted in statistically significant improvements in FEV1 compared with those patients who were continued on beclomethasone alone or those patients who were withdrawn from beclomethasone and treated with montelukast or placebo alone over the last 10 weeks of the 16-week, blinded treatment period. Patients who were randomized to treatment arms containing beclomethasone had statistically significantly better asthma control than those patients randomized to montelukast sodium alone or placebo alone as indicated by FEV1, daytime asthma symptoms, PEFR, nocturnal awakenings due to asthma, and "as-needed" β- agonist requirements.
    In adult patients with asthma with documented aspirin sensitivity, nearly all of whom were receiving concomitant inhaled and/or oral corticosteroids, a 4-week, randomized, parallel-group trial (n=80) demonstrated that montelukast sodium, compared with placebo, resulted in significant improvement in parameters of asthma control. The magnitude of effect of montelukast sodium in aspirin-sensitive patients was similar to the effect observed in the general population of asthma patients studied. The effect of montelukast sodium on the bronchoconstrictor response to aspirin or other non-steroidal anti-inflammatory drugs in aspirin-sensitive asthmatic patients has not been evaluated [see Warnings and Precautions (5.3)].

    14.2 Exercise-Induced Bronchoconstriction (EIB)

    Exercise-Induced Bronchoconstriction (Adults, Adolescents, and Pediatric Patients 6 years of age and older)
    The efficacy of montelukast sodium, 10 mg, when given as a single dose 2 hours before exercise for the prevention of EIB was investigated in three (U.S. and Multinational), randomized, double-blind, placebo-controlled crossover studies that included a total of 160 adult and adolescent patients 15 years of age and older with EIB. Exercise challenge testing was conducted at 2 hours, 8.5 or 12 hours, and 24 hours following administration of a single dose of study drug (montelukast sodium 10 mg or placebo). The primary endpoint was the mean maximum percent fall in FEV1 following the 2 hours post-dose exercise challenge in all three studies (Study A, Study B, and Study C). In Study A, a single dose of montelukast sodium 10 mg demonstrated a statistically significant protective benefit against EIB when taken 2 hours prior to exercise. Some patients were protected from EIB at 8.5 and 24 hours after administration; however, some patients were not. The results for the mean maximum percent fall at each timepoint in Study A are shown in TABLE 3 and are representative of the results from the other two studies.
    Table 3: Mean Maximum Percent Fall in FEV1 Following Exercise Challenge in Study A (N=47) ANOVA Model

    Time of exercise challenge
    following medication
    administration

    Mean Maximum percent fall in FEV1 *

    Treatment difference
     % for montelukast sodium versus Placebo (95% CI)*

    Montelukast sodium

    Placebo

    2 hours

    13

    22

    -9(-12,-5)

    8.5 hours

    12

    17

    -5(-9,-2)

    24 hours

    10

    14

    -4(-7,-1)

    * Least squares-mean
    The efficacy of montelukast sodium 5-mg chewable tablets, when given as a single dose 2 hours before exercise for the prevention of EIB, was investigated in one multinational, randomized, double-blind, placebo-controlled crossover study that included a total of 64 pediatric patients 6 to 14 years of age with EIB. Exercise challenge testing was conducted at 2 hours and 24 hours following administration of a single dose of study drug (montelukast sodium 5 mg or placebo). The primary endpoint was the mean maximum percent fall in FEV1 following the 2 hours post-dose exercise challenge. A single dose of montelukast sodium 5 mg demonstrated a statistically significant protective benefit against EIB when taken 2 hours prior to exercise (TABLE 4). Similar results were shown at 24 hours post-dose (a secondary endpoint). Some patients were protected from EIB at 24 hours after administration; however, some patients were not. No timepoints were assessed between 2 and 24 hours post-dose.
    Table 4: Mean Maximum Percent Fall in FEV1 Following Exercise Challenge in Pediatric Patients (N=64) ANOVA Model

     

    Time of exercise challenge following medication administration



    Mean  Maximum percent fall in FEV1*


    Treatment difference % formontelukast sodium
    versus Placebo (95% CI)*


    Montelukast sodium


    Placebo


    2 hours


    15


    20


    -5 (-9, -1)


    24 hours


    13


    17


    -4 (-7, -1)

    *Least squares-mean
    The efficacy of montelukast sodium for prevention of EIB in patients below 6 years of age has not been established.
    Daily administration of montelukast sodium for the chronic treatment of asthma has not been established to prevent acute episodes of EIB.
    In a 12-week, randomized, double-blind, parallel group study of 110 adult and adolescent asthmatics 15 years of age and older, with a mean baseline FEV1 percent of predicted of 83% and with documented exercise-induced exacerbation of asthma, treatment with montelukast sodium, 10 mg, once daily in the evening, resulted in a statistically significant reduction in mean maximal percent fall in FEV1 and mean time to recovery to within 5% of the pre-exercise FEV1. Exercise challenge was conducted at the end of the dosing interval (i.e., 20 to 24 hours after the preceding dose). This effect was maintained throughout the 12-week treatment period indicating that tolerance did not occur. Montelukast sodium did not, however, prevent clinically significant deterioration in maximal percent fall in FEV1 after exercise (i.e., ≥20% decrease from pre-exercise baseline) in 52% of patients studied. In a separate crossover study in adults, a similar effect was observed after two once-daily 10-mg doses of montelukast sodium.
    In pediatric patients 6 to 14 years of age, using the 5-mg chewable tablet, a 2-day crossover study demonstrated effects similar to those observed in adults when exercise challenge was conducted at the end of the dosing interval (i.e., 20 to 24 hours after the preceding dose).

    14.3 Allergic Rhinitis (Seasonal and Perennial)

    Seasonal Allergic Rhinitis
    The efficacy of montelukast sodium tablets for the treatment of seasonal allergic rhinitis was investigated in 5 similarly designed, randomized, double-blind, parallel-group, placebo- and active-controlled (loratadine) trials conducted in North America. The 5 trials enrolled a total of 5029 patients, of whom 1799 were treated with montelukast sodium tablets. Patients were 15 to 82 years of age with a history of seasonal allergic rhinitis, a positive skin test to at least one relevant seasonal allergen, and active symptoms of seasonal allergic rhinitis at study entry.
    The period of randomized treatment was 2 weeks in 4 trials and 4 weeks in one trial. The primary outcome variable was mean change from baseline in daytime nasal symptoms score (the average of individual scores of nasal congestion, rhinorrhea, nasal itching, sneezing) as assessed by patients on a 0 to 3 categorical scale.
    Four of the five trials showed a significant reduction in daytime nasal symptoms scores with montelukast sodium 10-mg tablets compared with placebo. The results of one trial are shown below. The median age in this trial was 35 years (range 15 to 81); 65.4% were females and 34.6% were males. The ethnic/racial distribution in this study was 83.1% Caucasian, 6.4% other origins, 5.8% Black, and 4.8% Hispanic. The mean changes from baseline in daytime nasal symptoms score in the treatment groups that received montelukast sodium tablets, loratadine, and placebo are shown in TABLE 5. The remaining three trials that demonstrated efficacy showed similar results.
    Table 5: Effects of Montelukast Sodium on Daytime Nasal Symptoms Score* in a Placebo- and Active-controlled Trial in Patients with Seasonal Allergic Rhinitis (ANCOVA Model)

    Treatment
    Group (N)

    Baseline Mean
    Score

    Mean Change
    from Baseline

    Difference
    Between Treatment
    and Placebo (95% CI)
    Least-Squares
    Mean

    Montelukast Sodium 10 mg
    (344)

    2.09

    -0.39

    -0.13† (-0.21,-0.06)

    Placebo (351)

    2.10

    -0.26

    N.A.

    Active Control‡
    (Loratadine 10 mg) (599)

    2.06

    -0.46

    -0.24 † (-0.31,-0.17)

    * Average of individual scores of nasal congestion, rhinorrhea, nasal itching, sneezing as assessed by patients on a 0 to 3 categorical scale.
    † Statistically different from placebo (p≤0.001).
    ‡  The study was not designed for statistical comparison between montelukast sodium and  the active control (loratadine).
    Perennial Allergic Rhinitis
    The efficacy of montelukast sodium tablets for the treatment of perennial allergic rhinitis was investigated in 2 randomized, double-blind, placebo-controlled studies conducted in North America and Europe. The two studies enrolled a total of 3357 patients, of whom 1632 received montelukast sodium 10-mg tablets. Patients 15 to 82 years of age with perennial allergic rhinitis as confirmed by history and a positive skin test to at least one relevant perennial allergen (dust mites, animal dander, and/or mold spores), who had active symptoms at the time of study entry, were enrolled.
    In the study in which efficacy was demonstrated, the median age was 35 years (range 15 to 81); 64.1% were females and 35.9% were males. The ethnic/racial distribution in this study was 83.2% Caucasian, 8.1% Black, 5.4% Hispanic, 2.3% Asian, and 1% other origins. Montelukast sodium  10-mg tablets once daily was shown to significantly reduce symptoms of perennial allergic rhinitis over a 6-week treatment period (TABLE 6); in this study the primary outcome variable was mean change from baseline in daytime nasal symptoms score (the average of individual scores of nasal congestion, rhinorrhea, and sneezing).
    Table 6: Effects of Montelukast Sodium on Daytime Nasal Symptoms Score* in a Placebo-controlled Trial in Patients with Perennial Allergic Rhinitis (ANCOVA Model)


    Treatment Group (N)


    Baseline mean Score


    Mean Change
    from Baseline


    Difference between Treatment
     and Placebo (95% CI)
     Least-Squares Mean


    Montelukast Sodium 10 mg
    (1000)


    2.09


    -0.42


    -0.08† (-0.12, -0.04)


    Placebo
    (980)


    2.10


    -0.35


    N.A.

    *   Average of individual scores of nasal congestion, rhinorrhea, sneezing as assessed by patients on a 0 to 3 categorical scale.
    †   Statistically different from placebo (p≤0.001).
    The other 6-week study evaluated montelukast sodium 10 mg (n=626), placebo (n=609), and an active-control (cetirizine 10 mg; n=120). The primary analysis compared the mean change from baseline in daytime nasal symptoms score for montelukast sodium vs. placebo over the first 4 weeks of treatment; the study was not designed for statistical comparison between montelukast sodium and the active-control. The primary outcome variable included nasal itching in addition to nasal congestion, rhinorrhea, and sneezing. The estimated difference between montelukast sodium and placebo was -0.04 with a 95% CI of (-0.09, 0.01). The estimated difference between the active-control and placebo was -0.10 with a 95% CI of (-0.19, -0.01).

  • 16 HOW SUPPLIED/STORAGE AND HANDLING

    •  
      Montelukast Sodium 5-mg (equivalent to 5-mg montelukast) Chewable Tablets are light pink colored, speckled, round, biconvex shaped, chewable tablets debossed with 'I' on one side and '113' on the other side.
      Bottles of 10 tablets NDC: 68788-7669-01
      Bottles of 14 tablets NDC: 68788-7669-04
      Bottles of 20 tablets NDC: 68788-7669-02
      Bottles of 30 tablets NDC: 68788-7669-03
      Bottles of 60 tablets NDC: 68788-7669-06
      Bottles of 90 tablets NDC: 68788-7669-09


      Storage
      Store at 20° to 25° C (68° to 77° F) [see USP Controlled Room Temperature]. Protect from moisture and light. Store in original container. When product container is subdivided, repackage into a well-closed, light-resistance container.
  • 17 PATIENT COUNSELING INFORMATION

    See FDA-approved patient labeling (Patient Information).
    Information for Patients
    Patients should be advised to take montelukast sodium chewable tablets daily as prescribed, even when they are asymptomatic, as well as during periods of worsening asthma, and to contact their physicians if their asthma is not well controlled.
    Patients should be advised that oral montelukast sodium chewable tablets are not for the treatment of acute asthma attacks. They should have appropriate short-acting inhaled β-agonist medication available to treat asthma exacerbations. Patients who have exacerbations of asthma after exercise should be instructed to have available for rescue a short-acting inhaled β-agonist. Daily administration of montelukast sodium tablets for the chronic treatment of asthma has not been established to prevent acute episodes of EIB.
    Patients should be advised that, while using montelukast sodium chewable tablets, medical attention should be sought if short-acting inhaled bronchodilators are needed more often than usual, or if more than the maximum number of inhalations of short-acting bronchodilator treatment prescribed for a 24-hour period are needed.
    Patients receiving montelukast sodium chewable tablets should be instructed not to decrease the dose or stop taking any other anti-asthma medications unless instructed by a physician.
    Patients should be instructed to notify their physician if neuropsychiatric events occur while using montelukast sodium chewable tablets.
    Patients with known aspirin sensitivity should be advised to continue avoidance of aspirin or non-steroidal anti-inflammatory agents while taking montelukast sodium chewable tablets.
    Phenylketonuric patients should be informed that the 4-mg and 5-mg chewable tablets contain phenylalanine (a component of aspartame).
    Manufactured for:

    address1

    Manufactured for:

    Camber Pharmaceuticals, Inc.

    Piscataway, NJ 08854.

    By: HETEROTM

    Hetero Labs Limited Unit-V, Polepally, Jadcherla, 

    Mahaboob Nagar-509 301, India.

                         
                Barcode
    Revised: 05/2017


    Repackaged by Preferred Pharmaceuticals, Inc.

  • PATIENT INFORMATION

    Patient Information
    Montelukast Sodium Chewable Tablets
    (mon-tell-OO-kast)
    Read the Patient Information Leaflet that comes with montelukast sodium chewable tablets before you start taking them and each time you get a refill. There may be new information. This leaflet does not take the place of talking with your healthcare provider about your medical condition or your treatment.
    What are montelukast sodium chewable tablets?
    Montelukast sodium chewable tablets are a prescription medicine that blocks substances in the body called leukotrienes. This may help to improve symptoms of asthma and allergic rhinitis. Montelukast sodium chewable tablets do not contain a steroid.
    Montelukast sodium chewable tablets are used to:
    1.Prevent asthma attacks and for the long-term treatment of asthma in adults and children ages 2 years and older.
    Do not take montelukast sodium chewable tablets if you need relief right away for a sudden asthma attack. If you get an asthma attack, you should follow the instructions your healthcare provider gave you for treating asthma attacks.
    2.Prevent exercise-induced asthma in people 6 years of age and older.
    3.Help control the symptoms of allergic rhinitis (sneezing, stuffy nose, runny nose,itching of the nose). Montelukast sodium chewable tablets are used to treat:
    outdoor allergies that happen part of the year (seasonal allergic rhinitis) in  adults and children ages 2 years and older, and
    indoor allergies that happen all year (perennial allergic rhinitis) in adults and children ages 2 years and older.
    Who should not take montelukast sodium chewable tablets?
    Do not take montelukast sodium chewable tablets if you are allergic to any of their ingredients.
    See the end of this leaflet for a complete list of the ingredients in montelukast sodium chewable tablets.
    What should I tell my healthcare provider before taking montelukast sodium chewable tablets?
    Before taking montelukast sodium chewable tablets, tell your healthcare provider if you:
    are allergic to aspirin
    have phenylketonuria. Montelukast sodium chewable tablets contain aspartame, a source of phenylalanine
    have any other medical conditions
    are pregnant or plan to become pregnant. Talk to your doctor if you are pregnant or plan to become pregnant, as montelukast sodium chewable tablets may not be right for you.
    are breast-feeding or plan to breast-feed.  It is not known if montelukast sodium passes into your breast milk.  Talk to your healthcare provider about the best way to feed your baby while taking montelukast sodium chewable tablets.
    Tell your healthcare provider about all the medicines you take, including prescription and non-prescription medicines, vitamins, and herbal supplements. Some medicines may affect how montelukast sodium chewable tablets works, or montelukast sodium chewable tablets may affect how your other medicines work.
    How should I take montelukast sodium chewable tablets?
    For anyone who takes montelukast sodium chewable tablets:
    Take montelukast sodium chewable tablets exactly as prescribed by your healthcare provider. Your healthcare provider will tell you how much montelukast sodium chewable tablets to take, and when to take them.
    Do not stop taking montelukast sodium chewable tablets or change when you take them without talking with your healthcare provider.
    You can take montelukast sodium chewable tablets with food or without food.
    If you or your child misses a dose of montelukast sodium chewable tablets, just take the next dose at your regular time. Do not take 2 doses at the same time.
    If you take too much montelukast sodium chewable tablets, call your healthcare provider or a Poison Control Center right away.
    For adults and children 2 years of age and older with asthma:
    Take montelukast sodium chewable tablets 1 time each day, in the evening. Continue to take montelukast sodium chewable tablets every day for as long as your healthcare provider prescribes it, even if you have no asthma symptoms.
    Tell your healthcare provider right away if your asthma symptoms get worse, or if you need to use your rescue inhaler medicine more often for asthma attacks.
    Do not take montelukast sodium chewable tablets if you need relief right away from a sudden asthma attack. If you get an asthma attack, you should follow the instructions your healthcare provider gave you for treating asthma attacks.
    Always have your rescue inhaler medicine with you for asthma attacks.
    Do not stop taking or lower the dose of your other asthma medicines unless your healthcare provider tells you to.
    For patients 6 years of age and older for the prevention of exercise-induced asthma:
    Take montelukast sodium chewable tablets at least 2 hours before exercise.
    Always have your rescue inhaler medicine with you for asthma attacks.
    If you take montelukast sodium chewable tablets every day for chronic asthma or allergic rhinitis, do not take another dose to prevent exercise-induced asthma. Talk to your healthcare provider about your treatment for exercise-induced asthma.
    Do not take 2 doses of montelukast sodium tablets within 24 hours (1day).
    For adults and children 2 years of age and older with seasonal allergic rhinitis , or for adults and children 2 years of age and older with perennial allergic rhinitis :
    Take montelukast sodium chewable tablets 1 time each day, at about the same time each day.
    What is the dose of montelukast sodium chewable tablets?
    The dose of montelukast sodium chewable tablets prescribed for your or your child's condition is based on age:
    2 to 5 years: one 4-mg chewable tablet.
    6 to 14 years: one 5-mg chewable tablet.
    15 years and older: one10-mg tablet.
    What should I avoid while taking montelukast sodium chewable tablets?
    If you have asthma and aspirin makes your asthma symptoms worse, continue to avoid taking aspirin or other medicines called non-steroidal anti-inflammatory drugs (NSAIDs) while taking montelukast sodium chewable tablets.
    What are the possible side effects of montelukast sodium chewable tablets?
    Montelukast sodium chewable tablets may cause serious side effects.
    Behavior and mood-related changes. Tell your healthcare provider right away if you or your child have any of these symptoms while taking montelukast sodium chewable tablets:
    agitation including aggressive behavior or hostility 
    irritability
    memory problems                                                           attention problems
    restlessness                                                                    bad or vivid dreams 
    sleep walking                                                                   depression 
    suicidal thoughts and actions                                          disorientation (confusion) (including suicide)
    feeling  anxious                                                                tremor
    hallucinations (seeing or hearing things that are              trouble sleeping
     not really there)                    
       uncontrolled muscle movements


    Increase in certain white blood cells (eosinophils) and possible inflamed blood vessels throughout the body (systemic vasculitis). Rarely, this can happen in people with asthma who take montelukast sodium chewable tablets. This sometimes happens in people who also take a steroid medicine by mouth that is being stopped or the dose is being lowered.
    Tell your healthcare provider right away if you get one or more of these symptoms:
    a feeling of pins and needles or numbness of arms or legs
    a flu-like illness
    rash
    severe inflammation (pain and swelling) of the sinuses (sinusitis)
    The most common side effects with montelukast sodium include:
    upper respiratory infection
    fever
    headache
    sore throat
    cough
    stomach pain
    diarrhea
    earache or ear infection
    flu
    runny nose
    sinus infection
    Other side effects with montelukast sodium include:
    increased bleeding tendency, low blood platelet count
    allergic reactions [including swelling of the face, lips, tongue, and/or throat (which may cause trouble breathing or swallowing), hives and itching]
    dizziness, drowsiness, pins and needles/numbness, seizures (convulsions or fits)
    palpitations
    nose bleed, stuffy nose, swelling (inflammation)of the lungs
    heartburn, indigestion, inflammation of the pancreas, nausea, stomach or intestinal upset, vomiting
    hepatitis
    bruising, rash, severe skin reactions (erythema multiforme, Stevens-Johnson syndrome/toxic epidermal necrolysis) that may occur without warning
    joint pain, muscle aches and muscle cramps
    bedwetting in children
    tiredness, swelling
    Tell your healthcare provider if you have any side effect that bothers you or that does not go away.
    These are not all the possible side effects of montelukast sodium chewable tablets. For more information ask your healthcare provider or pharmacist.
    Call your healthcare provider for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
    How should I store montelukast sodium chewable tablets?
    Store montelukast sodium chewable tablets at 20° to 25° C (68° to 77° F) [see USP Controlled Room Temperature].
    Keep montelukast sodium chewable tablets in the container it comes in.
    Keep montelukast sodium chewable tablets in a dry place and away from light.
    General Information about the safe and effective use of montelukast sodium chewable tablets
    Medicines are sometimes prescribed for purposes other than those mentioned in Patient Information Leaflets. Do not use montelukast sodium chewable tablets for a condition for which it was not prescribed. Do not give montelukast sodium chewable tablets to other people even if they have the same symptoms you have. It may harm them. Keep montelukast sodium chewable tablets and all medicines out of the reach of children.
    This leaflet summarizes information about montelukast sodium chewable tablets. If you would like more information, talk to your healthcare provider. You can ask your pharmacist or healthcare provider for information about montelukast sodium chewable tablets that is written for health professionals.
    What are the ingredients in montelukast sodium chewable tablets?
    Active ingredient: montelukast sodium, USP 
    Inactive ingredients: art cherry flavor, aspartame, croscarmellose sodium, ferric oxide red, hydroxypropyl cellulose, magnesium stearate, mannitol and microcrystalline cellulose.
    People with Phenylketonuria: Montelukast sodium chewable tablets 4-mg (equivalent to 4-mg montelukast) contain 0.672 mg of phenylalanine, and montelukast sodium chewable tablets 5-mg (equivalent to 5-mg montelukast) contain 0.84 mg of phenylalanine.
    Manfactured for:

    address2

    Manufactured for:

    Camber Pharmaceuticals, Inc.

    Piscataway, NJ 08854.

    By: HETEROTM

    Hetero Labs Limited Unit V, Polepally, Jadcherla,
    Mahaboob Nagar-509 301, India.                     
    Revised: 05/2017

    Repackaged by Preferred Pharmaceuticals, Inc.

  • PACKAGE LABEL.PRINCIPAL DISPLAY PANEL

    Montelukast Sodium Chewable Tablets 5 mg

    NDC: 68788-7669

    Montelukast Sodium Chewable Tablets 5mg
  • INGREDIENTS AND APPEARANCE
    MONTELUKAST SODIUM 
    montelukast sodium tablet, chewable
    Product Information
    Product TypeHUMAN PRESCRIPTION DRUGItem Code (Source)NDC: 68788-7669(NDC:31722-728)
    Route of AdministrationORAL
    Active Ingredient/Active Moiety
    Ingredient NameBasis of StrengthStrength
    MONTELUKAST (UNII: MHM278SD3E) (MONTELUKAST - UNII:MHM278SD3E) MONTELUKAST5 mg
    Inactive Ingredients
    Ingredient NameStrength
    ASPARTAME (UNII: Z0H242BBR1)  
    CROSCARMELLOSE SODIUM (UNII: M28OL1HH48)  
    FERRIC OXIDE RED (UNII: 1K09F3G675)  
    HYDROXYPROPYL CELLULOSE (1600000 WAMW) (UNII: RFW2ET671P)  
    MAGNESIUM STEARATE (UNII: 70097M6I30)  
    MANNITOL (UNII: 3OWL53L36A)  
    MICROCRYSTALLINE CELLULOSE (UNII: OP1R32D61U)  
    CHERRY (UNII: BUC5I9595W)  
    Product Characteristics
    ColorPINK (light pink) Scoreno score
    ShapeROUNDSize10mm
    FlavorImprint Code I;113
    Contains    
    Packaging
    #Item CodePackage DescriptionMarketing Start DateMarketing End Date
    1NDC: 68788-7669-110 in 1 BOTTLE; Type 0: Not a Combination Product02/28/2020
    2NDC: 68788-7669-414 in 1 BOTTLE; Type 0: Not a Combination Product02/28/2020
    3NDC: 68788-7669-220 in 1 BOTTLE; Type 0: Not a Combination Product02/28/2020
    4NDC: 68788-7669-330 in 1 BOTTLE; Type 0: Not a Combination Product02/28/2020
    5NDC: 68788-7669-660 in 1 BOTTLE; Type 0: Not a Combination Product02/28/2020
    6NDC: 68788-7669-990 in 1 BOTTLE; Type 0: Not a Combination Product02/28/2020
    Marketing Information
    Marketing CategoryApplication Number or Monograph CitationMarketing Start DateMarketing End Date
    ANDAANDA20409302/28/2020
    Labeler - Preferred Pharmaceuticals, Inc. (791119022)
    Registrant - Preferred Pharmaceuticals, Inc. (791119022)
    Establishment
    NameAddressID/FEIBusiness Operations
    Preferred Pharmaceuticals, Inc.791119022REPACK(68788-7669)
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