Glycerol phenylbutyrate (By mouth)
Glycerol Phenylbutyrate (GLI-ser-ol fen-il-BUE-ti-rate)
Treats urea cycle disorders to help remove nitrogen from the body.
There may be other brand names for this medicine.
When This Medicine Should Not Be Used
Do not use this medicine if you have had an allergic reaction to glycerol phenylbutyrate. Do not give this medicine to a child younger than 2 months old.
How to Use This Medicine
- Your doctor will tell you how much of this medicine to use and how often. Your dose may need to be changed several times in order to find out what works best for you. Do not use more medicine or use it more often than your doctor tells you to.
- It is best to take this medicine with food or milk.
- Measure the oral liquid medicine with a marked measuring spoon, oral syringe, or medicine cup.
- This medicine may be given through a feeding tube (nasogastric tube or gastrostomy tube).
- Use an oral syringe to measure the dose. Place it on the tip of the feeding tube.
- Inject the medicine into the tube.
- Flush the tube with 30 mL of water to rinse all of the medicine into the stomach.
- Rinse the tube again with another 30 mL of water to clear the tube.
- Carefully follow your doctor's instructions about any special diet.
- This medicine should come with a Medication Guide. Read and follow these instructions carefully. Ask your doctor or pharmacist if you have any questions. Ask your pharmacist for the Medication Guide if you do not have one.
If a dose is missed:
- If you miss a dose or forget to use your medicine, use it as soon as you can. If it is almost time for your next dose, wait until then to use the medicine and skip the missed dose. Do not use extra medicine to make up for a missed dose.
How to Store and Dispose of This Medicine
- Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light.
- Ask your pharmacist, doctor, or health caregiver about the best way to dispose of any outdated medicine or medicine no longer needed.
- Keep all medicine away from children and never share your medicine with anyone.
Drugs and Foods to Avoid
Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.
- Make sure your doctor knows if you are also using haloperidol (Haldol®), probenecid (Benemid®), valproic acid (Depakene®), or a steroid (such as dexamethasone, hydrocortisone, methylprednisolone, prednisolone, prednisone, Medrol®).
Warnings While Using This Medicine
- Make sure your doctor knows if you are pregnant or breastfeeding, or if you have kidney disease, liver disease, nerve problems, or digestive problems, including problems with your pancreas.
- Make sure your doctor knows if you have used a phenylbutyrate medicine before.
- Your doctor will need to check your blood at regular visits while you are using this medicine. Be sure to keep all appointments.
Possible Side Effects While Using This Medicine
Call your doctor right away if you notice any of these side effects:
- Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
- Burning, tingling, numbness or pain in the hands, arms, feet, or legs
- Confusion, memory problems
- Lightheadedness, headache, trouble hearing
- Nausea or vomiting, seizures, yellow eyes or skin
- Unusual sleepiness, tiredness, or weakness
If you notice these less serious side effects, talk with your doctor:
- Decreased appetite
- Diarrhea, gas, nausea, vomiting, stomach pain
If you notice other side effects that you think are caused by this medicine, tell your doctor
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088
- Last Reviewed on 06/12/2013
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This page was last updated: June 18, 2013