Description and Brand Names

Drug information provided by: Merative, Micromedex®

US Brand Name

  1. Zyflo
  2. Zyflo CR


Zileuton is used by patients with mild-to-moderate chronic asthma to decrease the symptoms of asthma and the number of acute asthma attacks. However, this medicine should not be taken to relieve an asthma attack that has already started.

This medicine is available only with your doctor's prescription.

Zileuton immediate-release tablets (Zyflo(R)) were withdrawn from the U. S. market by Critical Therapeutics on February 12, 2008. The extended-release formulation of zileuton (Zyflo CR(R)), also manufactured by Critical Therapeutics, Inc, is still available.

This product is available in the following dosage forms:

  • Tablet
  • Tablet, Extended Release