Why your doctor prescribed ZYFLO CR®
Your doctor may have prescribed ZYFLO CR® because it works differently than other medications you may have tried to help you gain control of your asthma symptoms.

ZYFLO CR® is designed to prevent chemicals called leukotrienes (luke-oh-TRY-enz) from being made by your body. Only zileuton, the active ingredient in ZYFLO CR®, helps stop the production of the leukotrienes that may contribute to the swelling and inflammation that cause asthma symptoms.

ZYFLO CR® has been shown to improve your ability to breathe in and out (your lung function) and may reduce your need for a rescue inhaler for sudden symptoms.

Why Zyflo CR
ZYFLO CR® on Facebook cornerstone
ZYFLO CR® is a medicine that is used to prevent asthma attacks and for long-term management of asthma in adults and children 12 years of age and older.  ZYFLO CR® is not a rescue medicine and should not be used if you need relief right away for an asthma attack. However, you can continue taking your regularly scheduled dose of ZYFLO CR® during an asthma attack.

*On co-pays up to $70. See savings card for details and instructions. Subject to availability. Restrictions apply.




Important Patient Safety Information


ZYFLO CR® is a medicine used to prevent asthma attacks and for long-term management of asthma in adults and children 12 years of age and older. ZYFLO CR® is not a rescue medicine and should not be used for immediate relief during an asthma attack.

You should not take ZYFLO CR® if you have active liver disease or repeated blood tests showing elevated liver enzymes. Your doctor may do blood tests to check your liver before you take ZYFLO CR® and while you are taking it. You should not take ZYFLO CR® if you have ever had an allergic reaction to ZYFLO CR® or any of its ingredients.

Tell your doctor about all the medicines you take, including prescription and non-prescription medicines. ZYFLO CR® and certain other medicines may affect each other causing side effects. Tell your doctor if you drink alcohol (how much and how often) and if you have ever had liver problems including hepatitis, jaundice (yellow eyes or skin), or dark urine.

In addition, report any changes in your behavior or sleeping habits while taking
ZYFLO CR®.

Some of the most common side effects are nose and throat irritation, sinusitis, upper respiratory infection, throat pain, headache, muscle aches, nausea, and diarrhea.

For additional safety information, please see Patient Product Information.

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit www.fda.gov/medwatch, or call 1-800-FDA-1088.