Generic name: Zileuton
Pregnancy & Lactation: Risk data not available
What is Zyflo CR?
Zileuton is used to prevent asthma attacks and for long-term management of asthma in adults and children at least 12 years old.
Zileuton may also be used for purposes not listed in this medication guide.
Warnings
You should not use zileuton if you are allergic to it, or if you have:
- liver disease; or
- very high liver enzymes on a blood test.
Tell your doctor if you have ever had:
- liver problems, dark urine, or jaundice (yellow eyes or skin); or
- if you drink large amounts of alcohol.
Tell your doctor if you are pregnant or breastfeeding.
If you are pregnant, your name may be listed on a pregnancy registry to track the effects of zileuton on the baby.
How should I use Zyflo CR
Use Zyflo CR (Oral) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.
Follow all directions on your prescription label and read all medication guides or instruction sheets. Use the medicine exactly as directed.
Zileuton tablets are usually taken 4 times a day at the same times each day, with or without food. If you cannot swallow a tablet whole, split it in half and take one half at a time.
Zileuton extended-release tablets are usually taken twice daily, within 1 hour after your morning and evening meals.
Swallow the extended-release tablet whole and do not crush, chew, or break it.
Your symptoms may not improve for several days or a few weeks. Keep using this medicine even after you have no symptoms (a sign that the medicine is working).
Zileuton is not a fast-acting rescue medicine for asthma attacks. Seek medical attention if your breathing problems get worse quickly, or if you think your medications are not working.
Do not change your dose or stop using asthma medication without your doctor's advice.
You will need frequent blood tests to check your liver function.
Store at room temperature away from moisture, heat, and light.
Skip the missed dose and take your next dose at the regular time. Do not take two doses at one time.
Zyflo CR side effects
Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
- worsening asthma symptoms;
- sleep problems;
- changes in behavior or sleep problems; or
- liver problems--nausea, stomach pain (upper right side), tiredness, itching, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes).
Common side effects may include:
- upset stomach, diarrhea, nausea, or stomach pain;
- muscle aches;
- headache; or
- runny or stuffy nose, sinus pain, sneezing, sore throat.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
What other drugs will affect Zyflo CR?
Avoid drinking alcohol. It may increase your risk of liver damage.