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Leukotriene Receptor Antagonist

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Leukotriene Receptor Antagonist, Leukotriene Antagonist, Leukotriene Synthesis Inhibitor, Accolate, Zafirlukast, Montelukast, Singulair, Zileuton, Zyflo

  • Preparations
  1. Zafirlukast (Accolate)
  2. Montelukast (Singulair)
  3. Zileuton (Zyflo)
  • Mechanism
  1. Attenuates bronchoconstriction and inflammation
  2. Leukotriene Receptor Antagonists
    1. Zafirlukast (Accolate)
    2. Montelukast (Singulair)
  3. Leukotriene Synthesis Inhibitor
    1. Zileuton (Zyflo)
  • Dosing
  • Zafirlukast (Accolate)
  1. Leukotriene Receptor Antagonist
  2. Avoid at mealtime
    1. Take 1 hour before or 2 hours after meals
  3. Dose
    1. Age >11 years old: 20 mg orally twice daily
    2. Child 7-11 years old: 10 mg orally twice daily
  • Dosing
  • Montelukast (Singulair)
  1. Leukotriene Receptor Antagonist
  2. Dose
    1. Adults: 10 mg orally at bedtime
    2. Child age 6 to 14 years: 5 mg orally at bedtime
    3. Child age 2-5 years: 4 mg orally at bedtime
  • Dosing
  • Zileuton (Zyflo)
  1. Leukotriene Synthesis Inhibitor
  2. Indicated only in age 12 and over
  3. Dosing
    1. Dose: 600 mg orally four times daily
  4. Risks
    1. Hepatotoxicity in 5% (Monitor liver enzymes q3 months)
    2. Drug Interactions: Warfarin, Theophylline, Propranolol
    3. Expensive ($273 per month)
  • Efficacy
  1. Modestly effective for maintenance management
  2. Inhaled Steroids are preferred over leukotriene agents
  3. Used as adjunctive therapy in Asthma
  4. Benefit may be limited to patients with the 5-LO and LTC4 polymorphisms
    1. Sampson (2004) RT J Respir Care Practitioners 17:30-2 [PubMed]
    2. Wechsler (2005) Am J Respir Crit Care Med 172(1): 12-8 [PubMed]
  • Adverse Effects
  1. Multiple P450 Drug Interactions
    1. Potentiates Warfarin
    2. Potentiates Theophylline
    3. Potentiates Propranolol
  2. Some association with Churg-Strauss Syndrome
    1. Systemic Eosinophilic Vasculitis
    2. Vasculitic rash
    3. Pulmonary and cardiac conditions
  3. Hepatotoxicity with Zileuton (Zyflo)