n/a
Kuvan is a brand-name medication containing sapropterin dihydrochloride, a synthetic form of tetrahydrobiopterin (BH4). It is used to reduce blood phenylalanine levels in patients with phenylketonuria (PKU), a genetic disorder in which the body cannot properly metabolize the amino acid phenylalanine. The medication is intended for use alongside a phenylalanine-restricted diet and is typically prescribed to patients who demonstrate responsiveness to BH4 therapy.
Kuvan is a BH4 replacement therapy used to manage phenylketonuria (PKU) by helping reduce dangerous phenylalanine levels in the blood.
Key facts at a glance
- RxNorm
- 751628
- Generic
- Kuvan
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Kuvan is indicated for the treatment of hyperphenylalaninemia in patients with phenylketonuria (PKU). It is specifically indicated for patients who have been shown to be responsive to BH4 therapy, which may include adults and children of all ages with residual phenylalanine hydroxylase activity.
Sapropterin dihydrochloride is a synthetic form of tetrahydrobiopterin (BH4), which serves as a cofactor for the enzyme phenylalanine hydroxylase. In PKU patients with some residual enzyme activity, BH4 helps increase the enzyme's activity, enabling the body to better metabolize phenylalanine and thereby reducing blood phenylalanine concentrations.
Kuvan should be used as an adjunct to a phenylalanine-restricted diet, not as a substitute. Not all PKU patients respond to BH4 therapy; response testing is typically performed before treatment initiation. Treatment requires regular monitoring of blood phenylalanine levels to ensure effectiveness and appropriate dosing. Patients should be aware of potential hypersensitivity reactions and inform their healthcare provider of all medications being taken.
Official drug label
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This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed July 26, 2026. · Read our editorial policy