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Zileuton is an orally active inhibitor of 5-lipoxygenase, the enzyme that catalyzes the formation of leukotrienes from arachidonic acid. Zileuton has the chemical name (±)-1(1-Benzo[b]thien-2-ylethyl)-1-hydroxyurea and the following chemical structure:
Zileuton has the molecular formula C11H12N2O2S and a molecular weight of 236.29. It is a racemic mixture (50:50) of R(+) and S(-) enantiomers. Zileuton is a practically odorless, white, crystalline powder that is soluble in methanol and ethanol, slightly soluble in acetonitrile, and practically insoluble in water and hexane. The melting point ranges from 144.2°C to 145.2°C. ZYFLO tablets for oral administration are supplied in one dosage strength containing 600 mg of zileuton.
Inactive Ingredients: crospovidone, hydroxypropyl cellulose, hypromellose, magnesium stearate, microcrystalline cellulose, pregelatinized starch, propylene glycol, sodium starch glycolate, talc, and titanium dioxide.
What are the precautions when taking zileutin (Zyflo)?
Before taking zileuton, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.
Before using this medication, tell your doctor or pharmacist your medical history, especially of: liver disease, alcohol use.
This drug may make you dizzy or drowsy. Do not drive, use machinery, or do any activity that requires alertness until you are sure you can perform such activities safely. Limit alcoholic beverages because alcohol may add to this drug's drowsiness/dizziness effects and possible liver problems.
Caution is advised when using this drug in elderly women because they may be more sensitive to...
Last reviewed on RxList: 6/29/2012
This monograph has been modified to include the generic and brand name in many instances.
Additional Zyflo Information
- Zyflo Drug Interactions Center: zileuton oral
- Zyflo Side Effects Center
- Zyflo Overview including Precautions
- Zyflo FDA Approved Prescribing Information including Dosage
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