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Information for Patients & Caregivers
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What is Phenylketonuria?


Importance of Phe


Managing PKU

KUVAN

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How KUVAN Works

Working at the source of the problem

In the body, the enzyme called phenylalanine hydroxylase (PAH) converts phenylalanine (Phe) into tyrosine in the presence of tetrahydrobiopterin (BH4). BH4 is a natural substance found in the body that helps reduce Phe to safe levels in the blood.

In PKU, the PAH enzyme doesn't work well and too much Phe builds up in the blood. High levels of Phe affect the brain if left untreated.

The active ingredient in KUVAN is a pharmaceutical version of BH4. It works in the same way as your body's BH4.

KUVAN adds more BH4 and stimulates the PAH enzyme to “wake up” and process Phe in PKU patients.

The PAH enzyme begins to convert Phe to tyrosine, and helps to keep your blood Phe levels low.
Proven to Lower Phe

Indication

KUVAN® (sapropterin dihydrochloride) Tablets are approved to reduce blood Phe levels in patients with hyperphenylalaninemia (HPA) due to tetrahydrobiopterin- (BH4-) responsive Phenylketonuria (PKU). KUVAN is to be used in conjunction with a low-Phe diet.

Important Safety Information

High blood Phe levels are toxic to the brain and can lead to lower intelligence and decrease in the ability to focus, remember and organize information. Any change you make to your diet may impact your blood Phe level. Follow your doctor's instructions carefully. Your doctor and dietitian will continue to monitor your diet and blood Phe levels throughout your treatment with KUVAN.

If you have a fever, or if you are sick, your Phe level may go up. Tell your doctor and dietitian as soon as possible so they can see if they have to adjust your treatment to help keep your blood Phe levels in the desired range.

KUVAN is a prescription medicine and should not be taken by people who are allergic to any of its ingredients. Tell your doctor if you have ever had liver or kidney problems, are nursing or pregnant or may become pregnant, have poor nutrition or are anorexic. Your doctor will decide if KUVAN is right for you. Tell your doctor about all the medicines you take.

The most common side effects reported when using KUVAN are headache, diarrhea, abdominal pain, upper respiratory tract infection (like a cold), throat pain, vomiting, and nausea.

To report SUSPECTED ADVERSE REACTIONS, contact BioMarin Pharmaceutical Inc. at 1-866-906-6100, or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

Please read the full Patient Information by clicking here.


This site is intended for use by U.S. residents only.

KUVAN® is a registered trademark of BioMarin Pharmaceutical Inc. Developed in collaboration with Asubio Pharma Co., Ltd.
©2010 BioMarin Pharmaceutical Inc. All rights reserved.