HOW IS HT-1 TREATED?

NITISINONE TABLETS

Nitisinone (NTBC) is the medicine that treats Hereditary Tyrosinemia Type-1 (HT-1), a lifelong genetic disease. Nitisinone blocks the breakdown of the amino acid Tyrosine. This prevents the formation of toxic substances.

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LOW-PROTEIN DIET

In conjunction with nitisinone use, a restricted low-protein diet is used to limit the intake of tyrosine and phenylalanine.

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NITISINONE TABLETS INDICATIONS

NITISINONE TABLETS, also known as NTBC tablets, are indicated for the treatment of hereditary tyrosinemia type 1 (HT-1) in combination with dietary restriction of tyrosine and phenylalanine.

Treatment with NITISINONE TABLETS should be initiated and supervised by a physician experienced in the treatment of HT-1.

IMPORTANT SAFETY INFORMATION ABOUT NITISINONE TABLETS

Contraindications:

  • Do not prescribe NITISINONE TABLETS to a patient that is hypersensitive to nitisinone or to any ingredient in the formulation.
  • Do not prescribe NITISINONE TABLETS if the patient is breast-feeding. Patients should not breast feed while taking NITISINONE TABLETS.

Warning and Precautions:

Endocrine and Metabolism: Elevated plasma tyrosine levels. Hematologic: Leukopenia and thrombocytopenia. Hepatic/Biliary/Pancreatic: Liver status should be assessed regularly through liver function tests. Neurologic: Variable degrees of intellectual disability and developmental delay have been observed in HT-1 patients treated with nitisinone. In patients treated with nitisinone who exhibit a change in neurologic status, a clinical laboratory assessment including plasma tyrosine should be performed. Ophthalmologic: Ocular signs and symptoms including corneal ulcers, corneal opacities, keratitis, conjunctivitis, eye pain, and photophobia have been reported in patients treated with nitisinone. Patients who develop photophobia, eye pain, or signs of inflammation such as redness, swelling, or burning of the eyes during treatment with NITISINONE TABLETS should undergo slit-lamp re-examination and immediate measurement of plasma tyrosine concentration.

Special Populations:

  • Pregnant women: NITISINONE TABLETS should be used in pregnancy only when the benefits of continued treatment are judged to outweigh the risks.
  • Nursing women: Because of the potential serious adverse reactions to nitisinone in nursing infants, mothers taking NITISINONE TABLETS should not breast-feed.
  • Pediatrics (< 18 years of age): Patients under 18 years should be monitored to ensure adequate control. It is recommended that a dietitian experienced in managing children with inborn errors of metabolism is consulted to design a low-protein diet restricted in tyrosine and phenylalanine.
  • Geriatrics (>65 years of age): Clinical studies of nitisinone did not include subjects over the age of 65 years, and no pharmacokinetic studies have been conducted in geriatric subjects.

Common Adverse Reactions:

The most common adverse reactions (≥1%) reported in patients treated with nitisinone (NTBC) are: Eye Disorders: conjunctivitis, corneal opacity, keratitis, photophobia, blepharitis and eye pain. Blood and lymphatic System Disorders: thrombocytopenia, leukopenia and granulocytopenia. Skin and subcutaneous tissue disorders: pruritis, exfoliative dermatitis and maculopapular rash. Investigations: elevated tyrosine levels.

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