FREQUENTLY ASKED QUESTIONS Horizon By Your Side FAQs
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Horizon By Your Side is a patient support program designed specifically for you, someone prescribed a Horizon medication. Once your enrollment is complete, you will be paired with your own dedicated support partner called a Patient Access Liaison (PAL). Your PAL will serve as your partner providing resources outside of your doctor to help you navigate your unique experience, including information on insurance, cost assistance options, upcoming appointments, and other patient-support services.

There is no cost to enroll, and there are two ways to join:

  • Option 1: Sign up through your doctor’s office. They can start the enrollment on HorizonByYourSide.com and submit it on your behalf. Patient consent is required.
  • Option 2: Connect with a Patient Access Liaison (PAL) to help you explore enrollment options. Call 1-855-823-7878.

Paying for treatment shouldn’t get in the way of your health. Whether you have commercial insurance, government insurance, or no insurance, the Horizon By Your Side team is committed to partnering with you to help understand your insurance coverage criteria and all available cost assistance options.

Once you and your doctor (and/or healthcare team) decide that a Horizon treatment is right for you, enrolling in Horizon By Your Side is easy. There is no cost to enroll, and there are two ways to join:

  • Option 1: Connect with a Patient Access Liaison (PAL) to help you explore enrollment options. Call 1-855-823-7878.
  • Option 2: Sign up through your doctor’s office. They can start the enrollment on HorizonByYourSide.com and submit it on your behalf. Patient consent is required.

Once enrollment is complete, your PAL will be your dedicated partner to help you get started and continue on your treatment, as prescribed by your doctor.

The Horizon By Your Side team is led by a Patient Access Liaison (PAL). The PAL is a dedicated support partner who helps investigate, explain, and educate on each step of your treatment experience. They will be your partner to support and champion you while accomplishing your treatment goals.

The PAL can educate and assist you with:

  • Learning about insurance coverage criteria and approval process
  • Understanding cost assistance options
  • Discussing what to expect at the start of treatment
  • Determining how treatment can fit into your routine
  • Receiving reminders to help you stay on your Horizon medicine
  • Discovering ways to connect with others, if interested

For more information, or if you have specific
questions, call 1-844-4MY-HBYS (1-844-469-4297)

Have More Questions?
Have More Questions?

Learn how to connect with a Patient Access Liaison (PAL) who can help you explore enrollment options.

How to Enroll

USE and IMPORTANT SAFETY INFORMATION

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

BUPHENYL may cause serious side effects, including:

Nervous system side effects (Neurotoxicity) Phenylacetate (PAA), a breakdown product of BUPHENYL, may cause nervous system side effects. Call your doctor or get medical help right away if you have any of these symptoms while taking BUPHENYL:

  • sleepiness
  • weakness
  • lightheadedness
  • problems with memory
  • worsening of numbness, tingling, or burning in your hands or feet
  • change in taste
  • problems with hearing
  • confusion
  • headache

What is BUPHENYL?

  • BUPHENYL® (sodium phenylbutyrate) Tablets is a prescription medicine that can be taken by mouth and BUPHENYL® (sodium phenylbutyrate) Powder is a prescription medicine that can be taken by mouth or feeding tube for the long-term management of high blood levels of ammonia (hyperammonemia) caused by a condition called a urea cycle disorder (UCD).
  • BUPHENYL only treats high blood levels of ammonia in patients with carbamylphosphate synthetase (CPS), ornithine transcarbamylase (OTC) and argininosuccinic acid synthetase (AS) deficiencies.
  • BUPHENYL can be used in infants up to 28 days old who have a complete enzyme deficiency, and in patients 1 month of age and older who have a partial enzyme deficiency and have a history of brain damage from high blood levels of ammonia.
  • BUPHENYL must be used along with a low-protein diet and in some cases, dietary supplements.
  • BUPHENYL is not used to treat acute (severe) hyperammonemia, which is a medical emergency.

Do not take BUPHENYL if you are allergic to phenylbutyrate. Call your doctor or go to the nearest hospital emergency room if you experience an allergic reaction while taking BUPHENYL.

Before taking BUPHENYL, tell your doctor about all of your medical conditions, including if you:

  • have heart failure or decreased kidney function, which may lead to retention of the sodium content of BUPHENYL with potentially serious consequences, such as worsening heart failure, high blood pressure, and swelling.
  • are pregnant or plan to become pregnant. It is not known if BUPHENYL will harm your unborn baby.
  • are breastfeeding or plan to breastfeed. It is not known if BUPHENYL passes into your breast milk. Breastfeeding is not recommended during treatment with BUPHENYL. Talk to your doctor about the best way to feed your baby if you take BUPHENYL.

What are possible side effects of BUPHENYL?

BUPHENYL may cause serious side effects, including:

  • See “What is the most important information I should know about BUPHENYL?”

The most common side effects of BUPHENYL include:

  • decreased appetite
  • body odor
  • bad taste
  • absent or irregular periods in women

These are not all of the possible side effects of BUPHENYL. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

For additional Important Safety Information, click here for the Patient Package Insert and discuss with your doctor.

USE and IMPORTANT SAFETY INFORMATION

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

BUPHENYL may cause serious side effects, including:

Nervous system side effects (Neurotoxicity) Phenylacetate (PAA), a breakdown product of BUPHENYL, may cause nervous system side effects. Call your doctor or get medical help right away if you have any of these symptoms while taking BUPHENYL:

  • sleepiness
  • weakness
  • lightheadedness
  • problems with memory
  • worsening of numbness, tingling, or burning in your hands or feet
  • change in taste
  • problems with hearing
  • confusion
  • headache

What is BUPHENYL?

  • BUPHENYL® (sodium phenylbutyrate) Tablets is a prescription medicine that can be taken by mouth and BUPHENYL® (sodium phenylbutyrate) Powder is a prescription medicine that can be taken by mouth or feeding tube for the long-term management of high blood levels of ammonia (hyperammonemia) caused by a condition called a urea cycle disorder (UCD).
  • BUPHENYL only treats high blood levels of ammonia in patients with carbamylphosphate synthetase (CPS), ornithine transcarbamylase (OTC) and argininosuccinic acid synthetase (AS) deficiencies.
  • BUPHENYL can be used in infants up to 28 days old who have a complete enzyme deficiency, and in patients 1 month of age and older who have a partial enzyme deficiency and have a history of brain damage from high blood levels of ammonia.
  • BUPHENYL must be used along with a low-protein diet and in some cases, dietary supplements.
  • BUPHENYL is not used to treat acute (severe) hyperammonemia, which is a medical emergency.

Do not take BUPHENYL if you are allergic to phenylbutyrate. Call your doctor or go to the nearest hospital emergency room if you experience an allergic reaction while taking BUPHENYL.

Before taking BUPHENYL, tell your doctor about all of your medical conditions, including if you:

  • have heart failure or decreased kidney function, which may lead to retention of the sodium content of BUPHENYL with potentially serious consequences, such as worsening heart failure, high blood pressure, and swelling.
  • are pregnant or plan to become pregnant. It is not known if BUPHENYL will harm your unborn baby.
  • are breastfeeding or plan to breastfeed. It is not known if BUPHENYL passes into your breast milk. Breastfeeding is not recommended during treatment with BUPHENYL. Talk to your doctor about the best way to feed your baby if you take BUPHENYL.

What are possible side effects of BUPHENYL?

BUPHENYL may cause serious side effects, including:

  • See “What is the most important information I should know about BUPHENYL?”

The most common side effects of BUPHENYL include:

  • decreased appetite
  • body odor
  • bad taste
  • absent or irregular periods in women

These are not all of the possible side effects of BUPHENYL. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

For additional Important Safety Information, click here for the Patient Package Insert and discuss with your doctor.

USE and IMPORTANT SAFETY INFORMATION

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

BUPHENYL may cause serious side effects, including:

Nervous system side effects (Neurotoxicity) Phenylacetate (PAA), a breakdown product of BUPHENYL, may cause nervous system side effects. Call your doctor or get medical help right away if you have any of these symptoms while taking BUPHENYL:

  • sleepiness
  • weakness
  • lightheadedness
  • problems with memory
  • worsening of numbness, tingling, or burning in your hands or feet
  • change in taste
  • problems with hearing
  • confusion
  • headache

What is BUPHENYL?

  • BUPHENYL® (sodium phenylbutyrate) Tablets is a prescription medicine that can be taken by mouth and BUPHENYL® (sodium phenylbutyrate) Powder is a prescription medicine that can be taken by mouth or feeding tube for the long-term management of high blood levels of ammonia (hyperammonemia) caused by a condition called a urea cycle disorder (UCD).
  • BUPHENYL only treats high blood levels of ammonia in patients with carbamylphosphate synthetase (CPS), ornithine transcarbamylase (OTC) and argininosuccinic acid synthetase (AS) deficiencies.
  • BUPHENYL can be used in infants up to 28 days old who have a complete enzyme deficiency, and in patients 1 month of age and older who have a partial enzyme deficiency and have a history of brain damage from high blood levels of ammonia.
  • BUPHENYL must be used along with a low-protein diet and in some cases, dietary supplements.
  • BUPHENYL is not used to treat acute (severe) hyperammonemia, which is a medical emergency.

Do not take BUPHENYL if you are allergic to phenylbutyrate. Call your doctor or go to the nearest hospital emergency room if you experience an allergic reaction while taking BUPHENYL.

Before taking BUPHENYL, tell your doctor about all of your medical conditions, including if you:

  • have heart failure or decreased kidney function, which may lead to retention of the sodium content of BUPHENYL with potentially serious consequences, such as worsening heart failure, high blood pressure, and swelling.
  • are pregnant or plan to become pregnant. It is not known if BUPHENYL will harm your unborn baby.
  • are breastfeeding or plan to breastfeed. It is not known if BUPHENYL passes into your breast milk. Breastfeeding is not recommended during treatment with BUPHENYL. Talk to your doctor about the best way to feed your baby if you take BUPHENYL.

What are possible side effects of BUPHENYL?

BUPHENYL may cause serious side effects, including:

  • See “What is the most important information I should know about BUPHENYL?”

The most common side effects of BUPHENYL include:

  • decreased appetite
  • body odor
  • bad taste
  • absent or irregular periods in women

These are not all of the possible side effects of BUPHENYL. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

For additional Important Safety Information, click here for the Patient Package Insert and discuss with your doctor.

USE and IMPORTANT SAFETY INFORMATION

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

BUPHENYL may cause serious side effects, including:

Nervous system side effects (Neurotoxicity) Phenylacetate (PAA), a breakdown product of BUPHENYL, may cause nervous system side effects. Call your doctor or get medical help right away if you have any of these symptoms while taking BUPHENYL:

  • sleepiness
  • weakness
  • lightheadedness
  • problems with memory
  • worsening of numbness, tingling, or burning in your hands or feet
  • change in taste
  • problems with hearing
  • confusion
  • headache

What is BUPHENYL?

  • BUPHENYL® (sodium phenylbutyrate) Tablets is a prescription medicine that can be taken by mouth and BUPHENYL® (sodium phenylbutyrate) Powder is a prescription medicine that can be taken by mouth or feeding tube for the long-term management of high blood levels of ammonia (hyperammonemia) caused by a condition called a urea cycle disorder (UCD).
  • BUPHENYL only treats high blood levels of ammonia in patients with carbamylphosphate synthetase (CPS), ornithine transcarbamylase (OTC) and argininosuccinic acid synthetase (AS) deficiencies.
  • BUPHENYL can be used in infants up to 28 days old who have a complete enzyme deficiency, and in patients 1 month of age and older who have a partial enzyme deficiency and have a history of brain damage from high blood levels of ammonia.
  • BUPHENYL must be used along with a low-protein diet and in some cases, dietary supplements.
  • BUPHENYL is not used to treat acute (severe) hyperammonemia, which is a medical emergency.

Do not take BUPHENYL if you are allergic to phenylbutyrate. Call your doctor or go to the nearest hospital emergency room if you experience an allergic reaction while taking BUPHENYL.

Before taking BUPHENYL, tell your doctor about all of your medical conditions, including if you:

  • have heart failure or decreased kidney function, which may lead to retention of the sodium content of BUPHENYL with potentially serious consequences, such as worsening heart failure, high blood pressure, and swelling.
  • are pregnant or plan to become pregnant. It is not known if BUPHENYL will harm your unborn baby.
  • are breastfeeding or plan to breastfeed. It is not known if BUPHENYL passes into your breast milk. Breastfeeding is not recommended during treatment with BUPHENYL. Talk to your doctor about the best way to feed your baby if you take BUPHENYL.

What are possible side effects of BUPHENYL?

BUPHENYL may cause serious side effects, including:

  • See “What is the most important information I should know about BUPHENYL?”

The most common side effects of BUPHENYL include:

  • decreased appetite
  • body odor
  • bad taste
  • absent or irregular periods in women

These are not all of the possible side effects of BUPHENYL. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

For additional Important Safety Information, click here for the Patient Package Insert and discuss with your doctor.