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KUVAN Dosing and Administration1

KUVAN® (sapropterin dihydrochloride) Tablets for Oral Use or Powder for Oral Solution is a once-daily medication taken along with food. A full prescription requires a medication trial to determine if patients are responsive.

  • Response to therapy is determined by a reduction in blood Phe level following treatment with KUVAN for up to 1 month
  • During the KUVAN trial, the patient should maintain a low-Phe diet

KUVAN follows a weight-based dosing regimen that also factors patient age into the equation.


  • KUVAN should be taken once a day (at the same time each day), preferably with the largest meal of the day
  • KUVAN Powder may be dissolved in water or apple juice or mixed in a small amount of soft food, such as apple sauce or pudding
    • KUVAN Tablets can be crushed and administered the same way as KUVAN Powder, or can be swallowed whole
    • Eat or drink the mixture within 30 minutes
  • Blood Phe levels must be monitored regularly

See full Instructions for Use for complete information on preparing and taking KUVAN.


Starting dose

  • Patients aged 1 month to 6 years: The recommended starting dose is 10 mg/kg taken once daily
  • See charts below for dosing options for infants weighing 10 kg or less
  • Patients aged 7 years and older: The recommended starting dose is 10 to 20 mg/kg taken once daily
KUVAN 10 mg/kg per Day Dosing for Infants Weighing 10 kg or Less1
KUVAN 20 mg/kg per Day Dosing for Infants Weighing 10 kg or Less1

Dose adjustments

  • If blood Phe does not decrease from baseline at 10 mg/kg per day, the dose may be increased to 20 mg/kg per day
  • Once responsiveness has been established, dosage of KUVAN may be adjusted within the range of 5 to 20 mg/kg taken once daily

KUVAN Powder dosing for infants

  • For patients weighing 10 kg or less, a 10 mg/kg dose of KUVAN Powder can be dissolved in as little as 5 mL or less of water or apple juice
  • The solution may be administered orally via an oral dosing syringe

Access a KUVAN dosing card.


  1. KUVAN [package insert]. Novato, CA: BioMarin Pharmaceutical Inc; 2015.


KUVAN® (sapropterin dihydrochloride) Tablets for Oral Use and Powder for Oral Solution are indicated to reduce blood phenylalanine (Phe) levels in adult and pediatric patients one month of age or older with hyperphenylalaninemia (HPA) due to tetrahydrobiopterin- (BH4-) responsive Phenylketonuria (PKU). KUVAN is to be used in conjunction with a Phe-restricted diet.


Treatment with KUVAN should be directed by physicians knowledgeable in the management of PKU. Prolonged exposure to elevated blood Phe levels can result in severe neurologic damage in PKU patients.

The use of KUVAN does not eliminate the need for careful monitoring of blood Phe levels and ongoing dietary management to ensure adequate Phe control and nutritional balance. Response to KUVAN can only be determined by a therapeutic trial. Patients should be advised to notify their physicians in cases of overdose.

Warnings and Precautions

  • Hypersensitivity Reactions Including Anaphylaxis: KUVAN is not recommended in patients with a history of anaphylaxis to KUVAN. Hypersensitivity reactions, including anaphylaxis and rash, have occurred. Signs of anaphylaxis include wheezing, dyspnea, coughing, hypotension, flushing, nausea, and rash. Discontinue KUVAN treatment in patients who experience anaphylaxis, and initiate appropriate medical treatment. Continue dietary Phe restrictions in patients who experience anaphylaxis.
  • Upper Gastrointestinal Mucosal Inflammation: Gastrointestinal (GI) adverse reactions suggestive of upper GI mucosal inflammation have been reported with KUVAN. Serious adverse reactions included esophagitis and gastritis. If left untreated, these could lead to severe sequelae including esophageal stricture, esophageal ulcer, gastric ulcer, and bleeding, and such complications have been reported in patients receiving KUVAN. Monitor patients for signs and symptoms of upper GI mucosal inflammation.
  • Hypophenylalaninemia: Some patients receiving KUVAN can experience significant drops in blood Phe levels, and children younger than 7 years old treated with KUVAN doses of 20 mg/kg per day are at an increased risk for low levels of blood Phe compared with children 7 years and older.
  • Monitoring Blood Phe Levels During Treatment: Prolonged elevations of blood Phe levels in patients with PKU can result in severe neurologic damage, including severe intellectual disability, developmental delay, microcephaly, delayed speech, seizures, and behavioral abnormalities. Conversely, prolonged levels of blood Phe that are too low have been associated with catabolism and endogenous protein breakdown, which has been associated with adverse developmental outcomes. Active management of dietary Phe intake and frequent blood Phe monitoring while taking KUVAN is required to ensure adequate Phe control and nutritional balance, especially in the pediatric population.
  • Lack of Biochemical Response to KUVAN: Not all patients with PKU respond to treatment with KUVAN. Biochemical response to KUVAN treatment cannot generally be pre-determined by laboratory testing (e.g., molecular testing), and should be determined through a therapeutic trial (evaluation) of KUVAN response.
  • Interactions with Levodopa: In a post-marketing safety surveillance program for a non- PKU indication using another formulation of the same active ingredient (sapropterin), there have been reports of an interaction with levodopa causing seizures, exacerbation of seizures, over-stimulation, and irritability. Monitor patients who are receiving levodopa for a change in neurologic status during treatment with KUVAN.
  • Hyperactivity: There have been post-marketing reports of hyperactivity with administration of KUVAN. Monitor patients for hyperactivity.

Adverse Reactions

  • Most common: The most common adverse reactions (incidence ≥4%) were headache, rhinorrhea, pharyngolaryngeal pain, diarrhea, vomiting, cough, and nasal congestion.
  • Additional adverse reactions reported in connection with worldwide marketing: hypersensitivity reactions including anaphylaxis and rash, esophagitis, gastritis, oropharyngeal pain, pharyngitis, esophageal pain, abdominal pain, dyspepsia, nausea, vomiting, and hyperactivity.

Additional Drug Interactions

  • Frequently monitor blood Phe levels when co-administering KUVAN with medications known to inhibit folate metabolism, such as methotrexate, valproic acid, phenobarbital, trimethoprim.
  • Monitor patients for hypotension when co-administering KUVAN with medications known to affect nitric oxide–mediated vasorelaxation such as PDE-5 inhibitors including sildenafil, vardenafil, or tadalafil.

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

Please read the full Prescribing Information by clicking here.