zafirlukast

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zafirlukast

 [zah-fir´loo-kast]
a leukotriene receptor antagonist used in treatment of asthma, administered orally.

zafirlukast

Accolate

Pharmacologic class: Leukotriene receptor antagonist

Therapeutic class: Antiasthmatic, bronchodilator

Pregnancy risk category B

Action

Antagonizes activity of three leukotrienes at specific receptor sites in airway smooth muscle, inhibiting inflammation

Availability

Tablets (coated): 10 mg, 20 mg

Indications and dosages

Prophylaxis and long-term treatment of asthma

Adults and children ages 12 and older: 20 mg P.O. b.i.d.

Children ages 5 to 11: 10 mg P.O. b.i.d.

Off-label uses

• Exercise-induced bronchospasm
• Chronic urticaria

Contraindications

• Hypersensitivity to drug or its components
• Hepatic impairment, including hepatic cirrhosis

Precautions

Use cautiously in:
• acute asthma attacks
• concurrent use of warfarin
• patients older than age 55
• pregnant patients
• breastfeeding patients (use not recommended)
• children younger than age 5 (safety not established).

Administration

• Give at least 1 hour before or 2 hours after a meal.

Adverse reactions

CNS: headache, dizziness, asthenia, insomnia, depression (especially in children and adolescents)

GI: nausea, vomiting, diarrhea, abdominal pain, dyspepsia

Hepatic: hepatic dysfunction including liver failure and death (rare)

Musculoskeletal: joint or back pain, myalgia

Other: fever, infection, pain

Interactions

Drug-drug.Aspirin: increased zafirlukast blood level

Erythromycin, theophylline: decreased zafirlukast blood level

Warfarin: increased warfarin effects, greater risk of bleeding

Drug-food.Any food: decreased rate and extent of zafirlukast absorption

Patient monitoring

• Assess patient's respiratory status to help evaluate drug efficacy.

Monitor liver function tests closely; watch for signs and symptoms of liver dysfunction.

Patient teaching

• Tell patient to take at least 1 hour before or 2 hours after a meal.
• Advise patient to take exactly as prescribed, even if he is symptom-free.

Tell patient to immediately report asthma attack. Advise him not to use drug for rapid relief of bronchospasm.
• Instruct patient to continue taking other asthma drugs unless prescriber directs otherwise.

Instruct patient to immediately report signs and symptoms of liver dysfunction (nausea, anorexia, fatigue, lethargy, pruritus, jaundice, flulike symptoms, or right upper quadrant abdominal pain).
• Instruct patient or caregiver to report insomnia or depression.
• Instruct female patient to consult prescriber if she plans to breastfeed.
• As appropriate, review all other significant adverse reactions and interactions, especially those related to the drugs and foods mentioned above.

za·fir·lu·kast

(za'fir-lū'kast),
A blocker of leukotriene D4 and E4 (LTD4 and LTE4) components of a slow-reacting substance of anaphylaxis (SRSA); used for the prophylaxis of asthma attacks.

zafirlukast

/za·fir·lu·kast/ (zah-fir´loo-kast) a leukotriene receptor antagonist used as an antiasthmatic agent.

zafirlukast

(zə-fîr′lo͞o-kăst′)
n.
A drug, C31H33N3O6S, that acts as a leukotriene receptor antagonist, reduces the inflammatory process, and is used in the treatment of asthma.

zafirlukast

a leukotriene receptor antagonist interfering with substances that cause swelling and tightening of the airway.
indications This drug is used for prophylaxis and chronic treatment of asthma in children and adults.
contraindications Known hypersensitivity to this drug prohibits its use.
adverse effects Adverse effects of this drug include headache, dizziness, nausea, diarrhea, abdominal pain, vomiting, infections, pain, asthenia, myalgia, fever, dyspepsia, and increased ALT.

za·fir·lu·kast

(za'fir-lū'kast)
A blocker of leukotriene D4 and E4 (LTD4 and LTE4) components of a slow-reacting substance of anaphylaxis (SRSA); used for prophylaxis of asthma.

Zafirlukast (Accolate)

An inhibitor that prevents leukotrienes from binding to cell receptors; taken over time, zafirlukast can help reduce or prevent asthma symptoms.