Ornithine transcarbamylase (OTC) deficiency is the most common type of UCD

If your child has OTC deficiency, you could too

Like other urea cycle disorders (UCDs), OTC deficiency is usually passed down from parent to child. In the case of OTC deficiency, some mothers who are “carriers” may not know they have the OTC gene until their child is diagnosed. A mother who is an OTC “carrier” has one unaffected gene and one OTC gene. OTC deficiency is most commonly passed from a mother to her child through her X chromosome. If your child has OTC deficiency, your child’s doctor may have told you that you are a “carrier” of OTC deficiency as well. “Carriers” of OTC deficiency may also have symptoms, that may need treatment.

How OTC can be inherited from the mother

OTC is the only UCD that is X-linked, which means it is passed down via the X chromosome.

OTC Deficiency Diagram

In rare cases, ornithine transcarbamylase (OTC) deficiency can be passed from a father to his daughter. This happens if the father has OTC himself. 

Ornithine transcarbamylase (OTC) deficiency symptoms can be subtle. But serious.

Mothers who are “carriers” of OTC deficiency may experience subtle OTC symptoms. The symptoms of OTC deficiency are often similar to the symptoms of other health conditions. So, paying attention to how you feel is important:

  • Do you ever feel suddenly tired or exhausted?
  • Do you have a poor appetite?
  • Do you get headaches or migraines?
  • Do you forget things from time to time?
  • Do you sometimes have trouble focusing or learning new things?
  • Do you avoid eating protein (chicken, beef, fish, nuts, yogurt) or feel sick after eating it?

Even mild symptoms can mean ammonia levels are high, which can be harmful over time. That’s why it’s important to talk to a metabolic specialist about these symptoms if you have them and find out if you need treatment.

Real Patients. Real Stories.

"I learned I had a urea cycle disorder
when my son was diagnosed."

– Patricia | Caregiver and OTC Patient

Talk to someone who’s been there

Treating High Ammonia Levels
Caused by UCDs

Learn about long-term ammonia control with RAVICTI, the #1 prescribed ammonia-controlling medicine*.

See the results

USE and IMPORTANT SAFETY INFORMATION

What is the most important safety information I should know about RAVICTI? RAVICTI may cause serious side effects, including: Nervous system side effects (Neurotoxicity). The breakdown of RAVICTI produces the byproduct phenylacetate (PAA), which may cause nervous system side effects.

What is RAVICTI?

RAVICTI (glycerol phenylbutyrate) Oral Liquid is a prescription medicine used for long-term management of high blood levels of ammonia (hyperammonemia) caused by a condition called a urea cycle disorder (UCD). RAVICTI should be used if the UCD cannot be managed with a low-protein diet and dietary supplements alone. RAVICTI must be used along with a low-protein diet and in some cases, dietary supplements.

RAVICTI is not used to treat extremely high levels of ammonia in the blood (hyperammonemic crisis) in people with UCDs.

It is not known if RAVICTI is safe and effective for the treatment of N-acetylglutamate synthase (NAGS) deficiency.

IMPORTANT SAFETY INFORMATION

What is the most important safety information I should know about RAVICTI?

RAVICTI may cause serious side effects, including:

Nervous system side effects (Neurotoxicity). The breakdown of RAVICTI produces the byproduct phenylacetate (PAA), which may cause nervous system side effects.

Call your doctor or get medical help right away if you have any of these symptoms while taking RAVICTI:

  • sleepiness
  • lightheadedness
  • change in taste
  • problems with hearing
  • confusion
  • problems with memory
  • worsening of numbness, tingling, or burning in your hands or feet
  • headache
  • feeling very tired (fatigue)
  • nausea
  • vomiting

Who should not take RAVICTI?

Do not take RAVICTI if you are allergic to phenylbutyrate. Call your doctor or go to the nearest hospital emergency room if you experience any of the following symptoms of an allergic reaction while taking RAVICTI:

  • wheezing
  • shortness of breath
  • cough
  • low blood pressure
  • flushing
  • nausea
  • skin rash

What should I tell my doctor before taking RAVICTI?

Tell your doctor about any medical conditions and if you:

  • Have liver or kidney problems.
    • Have pancreas or bowel (intestine) problems.
      • Are pregnant or plan to become pregnant. It is not known if RAVICTI will harm your unborn baby.
        • Pregnancy Registry: There is a Pregnancy Registry for women who take RAVICTI just before becoming pregnant or who become pregnant during treatment with RAVICTI. The purpose of this registry is to collect information about the health of you and your baby. Talk to your doctor about how you can join the Pregnancy Registry. For more information about this registry, call 1-855-823-2595 or visit www.ucdregistry.com.
      • Are breastfeeding or plan to breastfeed. It is not known if RAVICTI passes into your breast milk. Breastfeeding is not recommended during treatment with RAVICTI. Talk to your doctor about the best way to feed your baby if you take RAVICTI.

        What are possible side effects of RAVICTI?

        RAVICTI may cause serious side effects, including:

        • See "What is the most important information I should know about RAVICTI?"

        The most common side effects of RAVICTI in adults include:

        • diarrhea
        • gas
        • headache
        • abdomen (stomach) pain
        • vomiting
        • tiredness
        • decreased appetite
        • indigestion or heartburn

        The most common side effects of RAVICTI in children 2 years to 17 years of age include:

        • upper abdomen (stomach) pain
        • rash
        • nausea
        • vomiting
        • diarrhea
        • decreased appetite
        • headache

        The most common side effects of RAVICTI in children 2 months to less than 2 years of age include:

        • low white blood cell count (neutropenia)
        • vomiting
        • constipation
        • diarrhea
        • fever
        • reduced food intake
        • cough
        • stuffy nose
        • runny nose
        • skin rash
        • small round bumps on the skin

        The most common side effects of RAVICTI in children less than 2 months of age include:

        • vomiting
        • rash
        • gastroesophageal reflux
        • increased levels of liver enzymes in the blood
        • decreased appetite and reduced food intake
        • low red blood cell count (anemia)
        • cough
        • loss of too much body fluid (dehydration)
        • too much acid in the blood (acidosis)
        • high blood platelet count (thrombocytosis)
        • low blood platelet count (thrombocytopenia)
        • low blood neutrophil count (type of white blood cell) (neutropenia)
        • high white blood cell count (lymphocytosis)
        • diarrhea
        • gas
        • constipation
        • fever
        • drowsiness (lethargy)
        • irritability
        • agitation

        These are not all of the possible side effects of RAVICTI. Call your doctor for medical advice about side effects.

        You are encouraged to report negative side effects of prescription drugs to the FDA. Visit http://www.fda.gov/medwatch or call 1-800-FDA-1088.

        For additional important safety information, click here for the Medication Guide and discuss with your doctor.

        USE and IMPORTANT SAFETY INFORMATION

        What is the most important safety information I should know about RAVICTI? RAVICTI may cause serious side effects, including: Nervous system side effects (Neurotoxicity). The breakdown of RAVICTI produces the byproduct phenylacetate (PAA), which may cause nervous system side effects.

        What is RAVICTI?

        RAVICTI (glycerol phenylbutyrate) Oral Liquid is a prescription medicine used for long-term management of high blood levels of ammonia (hyperammonemia) caused by a condition called a urea cycle disorder (UCD). RAVICTI should be used if the UCD cannot be managed with a low-protein diet and dietary supplements alone. RAVICTI must be used along with a low-protein diet and in some cases, dietary supplements.

        RAVICTI is not used to treat extremely high levels of ammonia in the blood (hyperammonemic crisis) in people with UCDs.

        It is not known if RAVICTI is safe and effective for the treatment of N-acetylglutamate synthase (NAGS) deficiency.

        IMPORTANT SAFETY INFORMATION

        What is the most important safety information I should know about RAVICTI?

        RAVICTI may cause serious side effects, including:

        Nervous system side effects (Neurotoxicity). The breakdown of RAVICTI produces the byproduct phenylacetate (PAA), which may cause nervous system side effects.

        Call your doctor or get medical help right away if you have any of these symptoms while taking RAVICTI:

        • sleepiness
        • lightheadedness
        • change in taste
        • problems with hearing
        • confusion
        • problems with memory
        • worsening of numbness, tingling, or burning in your hands or feet
        • headache
        • feeling very tired (fatigue)
        • nausea
        • vomiting

        Who should not take RAVICTI?

        Do not take RAVICTI if you are allergic to phenylbutyrate. Call your doctor or go to the nearest hospital emergency room if you experience any of the following symptoms of an allergic reaction while taking RAVICTI:

        • wheezing
        • shortness of breath
        • cough
        • low blood pressure
        • flushing
        • nausea
        • skin rash

        What should I tell my doctor before taking RAVICTI?

        Tell your doctor about any medical conditions and if you:

        • Have liver or kidney problems.
          • Have pancreas or bowel (intestine) problems.
            • Are pregnant or plan to become pregnant. It is not known if RAVICTI will harm your unborn baby.
              • Pregnancy Registry: There is a Pregnancy Registry for women who take RAVICTI just before becoming pregnant or who become pregnant during treatment with RAVICTI. The purpose of this registry is to collect information about the health of you and your baby. Talk to your doctor about how you can join the Pregnancy Registry. For more information about this registry, call 1-855-823-2595 or visit www.ucdregistry.com.
            • Are breastfeeding or plan to breastfeed. It is not known if RAVICTI passes into your breast milk. Breastfeeding is not recommended during treatment with RAVICTI. Talk to your doctor about the best way to feed your baby if you take RAVICTI.

              What are possible side effects of RAVICTI?

              RAVICTI may cause serious side effects, including:

              • See "What is the most important information I should know about RAVICTI?"

              The most common side effects of RAVICTI in adults include:

              • diarrhea
              • gas
              • headache
              • abdomen (stomach) pain
              • vomiting
              • tiredness
              • decreased appetite
              • indigestion or heartburn

              The most common side effects of RAVICTI in children 2 years to 17 years of age include:

              • upper abdomen (stomach) pain
              • rash
              • nausea
              • vomiting
              • diarrhea
              • decreased appetite
              • headache

              The most common side effects of RAVICTI in children 2 months to less than 2 years of age include:

              • low white blood cell count (neutropenia)
              • vomiting
              • constipation
              • diarrhea
              • fever
              • reduced food intake
              • cough
              • stuffy nose
              • runny nose
              • skin rash
              • small round bumps on the skin

              The most common side effects of RAVICTI in children less than 2 months of age include:

              • vomiting
              • rash
              • gastroesophageal reflux
              • increased levels of liver enzymes in the blood
              • decreased appetite and reduced food intake
              • low red blood cell count (anemia)
              • cough
              • loss of too much body fluid (dehydration)
              • too much acid in the blood (acidosis)
              • high blood platelet count (thrombocytosis)
              • low blood platelet count (thrombocytopenia)
              • low blood neutrophil count (type of white blood cell) (neutropenia)
              • high white blood cell count (lymphocytosis)
              • diarrhea
              • gas
              • constipation
              • fever
              • drowsiness (lethargy)
              • irritability
              • agitation

              These are not all of the possible side effects of RAVICTI. Call your doctor for medical advice about side effects.

              You are encouraged to report negative side effects of prescription drugs to the FDA. Visit http://www.fda.gov/medwatch or call 1-800-FDA-1088.

              For additional important safety information, click here for the Medication Guide and discuss with your doctor.

              *According to data sourced from IQVIA and Horizon, between 6/01/2018 to 5/31/2019. Based on the total number of unique patients who had at least one dispense for RAVICTI in the United States.