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allergy care centers virginia |
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allergy care centers virginia DESCRIPTION Zafirlukast is a synthetic, selective peptide leukotriene receptor antagonist(LTRA), with the chemical name 4-(5-cyclopentyloxy-carbonylamino-1-methyl-indol-3-ylmethyl)-3-methoxy-N-o-tolylsulfonylbenzamide allergy care centers virginia. The molecular weight of zafirlukast is 575.7 and the structural formula is:
Zafirlukast, a fine white to pale yellow amorphous powder, is practically insolublein water allergy care centers virginia. It is slightly soluble in methanol and freely soluble in tetrahydrofuran,dimethylsulfoxide, and acetone allergy care centers virginia. ACCOLATE is supplied as 10 and 20 mg tablets for oral administration allergy care centers virginia. Inactive Ingredients: Film-coated tablets containing croscarmellose sodium,lactose, magnesium stearate, microcrystalline cellulose, povidone, hypromellose,and titanium dioxide allergy care centers virginia.
In vitro studies demonstrated that zafirlukast antagonized the contractileactivity of three leukotrienes (LTC 4 , LTD 4 and LTE 4 ) in conducting airwaysmooth muscle from laboratory animals and humans allergy care centers virginia. Zafirlukast prevented intradermalLTD 4 -induced increases in cutaneous vascular permeability and inhibited inhaledLTD 4 -induced influx of eosinophils into animal lungs allergy care centers virginia. Inhalational challengestudies in sensitized sheep showed that zafirlukast suppressed the airway responsesto antigen; this included both the early- and late-phase response and the nonspecifichyperresponsiveness allergy care centers virginia. In humans, zafirlukast inhibited bronchoconstriction caused by several kindsof inhalational challenges allergy care centers virginia. Pretreatment with single oral doses of zafirlukastinhibited the bronchoconstriction caused by sulfur dioxide and cold air in patientswith asthma allergy care centers virginia. Pretreatment with single doses of zafirlukast attenuated the early-and late-phase reaction caused by inhalation of various antigens such as grass,cat dander, ragweed, and mixed antigens in patients with asthma allergy care centers virginia. Zafirlukastalso attenuated the increase in bronchial hyperresponsiveness to inhaled histaminethat followed inhaled allergen challenge allergy care centers virginia. Clinical Pharmacokinetics and Bioavailability: Distribution Metabolism Excretion In the pivotal bioequivalence study, the mean terminal half-life of zafirlukastis approximately 10 hours in both normal adult subjects and patients with asthma allergy care centers virginia. In other studies, the mean plasma half-life of zafirlukast ranged from approximately8 to 16 hours in both normal subjects and patients with asthma allergy care centers virginia. The pharmacokineticsof zafirlukast are approximately linear over the range from 5 mg to 80 mg allergy care centers virginia. Steady-stateplasma concentrations of zafirlukast are proportional to the dose and predictablefrom single-dose pharmacokinetic data allergy care centers virginia. Accumulation of zafirlukast in the plasmafollowing twice-daily dosing is approximately 45% allergy care centers virginia. The pharmacokinetic parameters of zafirlukast 20 mg administered as a singledose to 36 male volunteers are shown with the table below allergy care centers virginia. Mean (% Coefficient of Variation) pharmacokinetic
Race: No differences in the pharmacokinetics of zafirlukast due to race havebeen observed allergy care centers virginia. Elderly: The apparent oral clearance of zafirlukast decreases with age allergy care centers virginia. Inpatients above 65 years of age, there is an approximately 2-3 fold greater Cmax and AUC compared to young adult patients allergy care centers virginia. Children: Following administration of a single 20 mg dose of zafirlukast to20 boys and girls between 7 and 11 years of age, and in a second study, to 29boys and girls between 5 and 6 years of age, the following pharmacokinetic parameterswere obtained: Parameter Children age
Zafirlukast disposition was unchanged after multiple dosing (20 mg twice daily)in children and the degree of accumulation in plasma was similar to that observedin adults allergy care centers virginia. Hepatic Insufficiency: In a study of patients with hepatic impairment (biopsy-provencirrhosis), there was a reduced clearance of zafirlukast resulting in a 50-60%greater C max and AUC compared to normal subjects allergy care centers virginia. Renal Insufficiency: Based on a cross-study comparison, there are no apparentdifferences in the pharmacokinetics of zafirlukast between renally-impairedpatients and normal subjects allergy care centers virginia. Drug-Drug Interactions
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