Mechanism of Action
Zafirlukast is a selective and competitive receptor antagonist of leukotriene D4 and E4 (LTD4 and LTE4), components of slow-reacting substance of anaphylaxis (SRSA). Cysteinyl leukotriene production and receptor occupation have been correlated with the pathophysiology of asthma, including airway edema, smooth muscle constriction, and altered cellular activity associated with the inflammatory process, which contribute to the signs and symptoms of asthma. Patients with asthma were found in one study to be 25100 times more sensitive to the bronchoconstricting activity of inhaled LTD4 than nonasthmatic subjects.
In vitro studies demonstrated that zafirlukast antagonized the contractile activity of three leukotrienes (LTC4, LTD4 and LTE4) in conducting airway smooth muscle from laboratory animals and humans. Zafirlukast prevented intradermal LTD4-induced increases in cutaneous vascular permeability and inhibited inhaled LTD4-induced influx of eosinophils into animal lungs. Inhalational challenge studies in sensitized sheep showed that zafirlukast suppressed the airway responses to antigen; this included both the early-and late-phase response and the nonspecific hyperresponsiveness.
In humans, zafirlukast inhibited bronchoconstriction caused by several kinds of inhalational challenges. Pretreatment with single oral doses of zafirlukast inhibited the bronchoconstriction caused by sulfur dioxide and cold air in patients with asthma. 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. Zafirlukast also attenuated the increase in bronchial hyperresponsiveness to inhaled histamine that followed inhaled allergen challenge.
ACCOLATE is indicated for the prophylaxis and chronic treatment of asthma in adults and children 5 years of age and older.
Dr. Reddy总部位于印度海得拉巴，是全球领先的活性药物成分（API）供应商之一。 Dr. Reddy的API业务是美国、欧洲、巴西、拉丁美洲、日本、中国、韩国和新兴市场的制药公司的首选合作伙伴。
Reddy博士的API业务在过去30多年来在开发和制造复杂API（如类固醇，多肽，复杂长链分子和高效API（HPAPI /肿瘤药物））方面所建立的深厚技术优势中茁壮成长。 我们在知识产权和法规事务方面的实力可以帮助我们始终如一地达到并超越监管标准，从而为这一专业知识提供补充。 Reddy博士 扎鲁司特（无定形） API是研发，知识产权和监管方面广泛专业知识的结果。
帮助我们的客户率先进入市场的关键组成部分是响应式供应链。 我们通过确保所有设施都高效运行并达到最新的质量，安全和生产率标准来实现这一目标。 业务和工厂之间的强大互联可以快速响应动态的市场变化，从而避免短缺并满足需求的突然激增。