Sapropterin (By mouth)
Lowers phenylalanine levels in the blood of patients with phenylketonuria (PKU). This medicine is usually given along with a special diet.
There may be other brand names for this medicine.
When This Medicine Should Not Be Used
You should not use this medicine if you have had an allergic reaction to sapropterin.
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.
- Carefully follow your doctor's instructions about any special diet. It is important that you maintain a diet with restricted amounts of phenylalanine.
- It is best to take this medicine with food or milk.
- Mix the tablets in 4 to 8 ounces (1/2 to 1 cup) of water or apple juice before taking. It may take a few minutes for the tablets to dissolve. To make the tablets dissolve faster, you may stir or crush them. Drink this mixture within 15 minutes.
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- Ask your pharmacist, doctor, or health caregiver about the best way to dispose of any outdated medicine or medicine no longer needed.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 using levodopa (such as Dopar® or Larodopa®), methotrexate (such as Rheumatrex® or Trexall®), sildenafil (Viagra®), tadalafil (Cialis®), or vardenafil (Levitra®).
Warnings While Using This Medicine
- Make sure your doctor knows if you are pregnant or breastfeeding, or if you have liver problems, kidney problems, fever or any illness, an eating disorder (such as anorexia), or malnutrition.
- 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
- Fever, cough, or sore throat.
If you notice these less serious side effects, talk with your doctor:
- Diarrhea, nausea, vomiting, or stomach pain.
- Runny or stuffy nose.
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