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XYWAV® Idiopathic Hypersomnia Homepage

XYWAV and Idiopathic Hypersomnia (IH) FAQs

Idiopathic Hypersomnia is a rare central sleep disorder. Idiopathic means the cause is unknown. Central means it is related to how the brain works.

Some key symptoms of Idiopathic Hypersomnia are feeling very sleepy during the day; experiencing sleep inertia (sleep drunkenness); and long, unrefreshing sleep. People living with Idiopathic Hypersomnia still experience these symptoms despite sleeping a typical (or more than typical) amount each night.

Learn more about Idiopathic Hypersomnia 

XYWAV is the first and only FDA-approved treatment for Idiopathic Hypersomnia. It is indicated for adults living with Idiopathic Hypersomnia.

Download the XYWAV Idiopathic Hypersomnia brochure to learn more 

Learn more about XYWAV 

XYWAV is thought to work during sleep to help with the symptoms of Idiopathic Hypersomnia during the day. The exact way XYWAV works for the treatment of Idiopathic Hypersomnia is unknown.

The efficacy of XYWAV was studied in 115 people aged 19-75 with Idiopathic Hypersomnia. The XYWAV Idiopathic Hypersomnia clinical study was a double-blind, randomized withdrawal trial. That means all people in the clinical study started treatment with XYWAV. They all adjusted XYWAV to a stable dose (the dose that worked best for them). Then they were randomly assigned to continue treatment with XYWAV or switched to placebo for 2 weeks. Neither the clinical investigators nor the people in the study knew who got XYWAV or who got placebo.

Learn more about study results with XYWAV in Idiopathic Hypersomnia 

The most common side effects in adult patients treated with XYWAV in the Idiopathic Hypersomnia clinical study included nausea, headache, dizziness, anxiety, insomnia, decreased appetite, excessive sweating (hyperhidrosis), vomiting, diarrhea, dry mouth, parasomnia (a sleep disorder that can include abnormal dreams, abnormal rapid eye movement [REM] sleep, sleep paralysis, sleep talking, sleep terror, sleep-related eating disorder, sleepwalking, and other abnormal sleep-related events), sleepiness (somnolence), fatigue, and tremor. In patients who remained on treatment, side effects tended to occur early and diminish over time.

These are not all the possible side effects of XYWAV. For more information, ask your doctor or pharmacist. Call your doctor for medical advice about side effects. You are encouraged to report negative side effects of prescription drugs to the FDA. Visit www.fda.gov/medwatch, or call 1-800-FDA-1088.

Learn more about the possible side effects with XYWAV in Idiopathic Hypersomnia 

After starting XYWAV, it may take some time for you and your doctor to determine the right dose, and to see symptoms improve. Your doctor will decide on a starting dose. If needed, they may adjust your dose or dosing routine.

XYWAV oral solution contains oxybate, a central nervous system (CNS) depressant. XYWAV contains a mixture of calcium oxybate, magnesium oxybate, potassium oxybate, and sodium oxybate. A 9 gram/night dose contains 687 mg of calcium, 182 mg of magnesium, 642 mg of potassium, and 131 mg of sodium. XYWAV also contains an artificial sweetener called sucralose. XYWAV does not contain any ingredient made from a gluten-containing grain (wheat, barley, or rye).

If your doctor prescribes you nightly XYWAV, they will give you detailed instructions on how to take your prescribed dose(s). You will also receive additional materials to ensure that you understand how to prepare and take your nightly XYWAV dose(s).

Learn more about taking XYWAV 

Please refer to the Medication Guide for detailed information about preparing and taking XYWAV 

It's easy to understand why you might worry about taking your second dose. You may want to set an alarm clock to help you wake up for your second dose of XYWAV. If you miss your second dose, skip that dose. Do not take XYWAV again until the next night. Never take two doses of XYWAV at one time.

Please refer to the Medication Guide for detailed information about preparing and taking XYWAV 

If you have questions about how taking XYWAV may impact you, please talk to your doctor.

Jazz Pharmaceuticals is committed to making sure that people who are prescribed XYWAV can get it affordably.

Learn about financial assistance options for qualified patients 

Jazz Pharmaceuticals, the leader in sleep medicine, is committed to helping you get therapy support and assistance throughout your treatment journey based on your personal needs every step of the way.

  • Nurse and pharmacy support—Your JazzCares® Nurse Case Manager will be with you from the very beginning in your treatment journey, and a pharmacist is available 24/7 to answer questions about your prescription.
  • Access and affordability—The Certified Pharmacy will assist you with navigating the insurance process and understanding your insurance coverage to help get your treatment started.
  • Personalized resources—At different points along the way, you will receive relevant tools and resources to help as you start and continue your therapy, including:
    • myWAV, the 24/7 digital tool for personalized support and motivation
    • A Starter Kit to help you get started on your path to your first shipment of XYWAV
    • A Welcome Kit to help manage your XYWAV treatment
    • Prescription refill reminders
    • Information and support resources for caregivers and loved ones
  • Helpful Materials—Download the XYWAV Idiopathic Hypersomnia Brochure, Idiopathic Hypersomnia Severity Scale (IHSS), Epworth Sleepiness Scale (ESS), and Doctor Visit Checklist to learn more about XYWAV and help measure your symptoms.

Because of the risk of CNS depression, abuse, and misuse, XYWAV is available only through a restricted distribution program called the XYWAV and XYREM REMS. You must be enrolled in this program to receive XYWAV.

In addition, the Certified Pharmacy is the only pharmacy in the United States that is permitted to fill your XYWAV prescription and send it directly to you. Call the Certified Pharmacy at 1-866-997-3688 for more information.

Learn more 

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XYWAV® (calcium, magnesium, potassium, and sodium oxybates) oral solution, 0.5 g/mL total salts (equivalent to 0.413 g/mL of oxybate) is a prescription medicine used to treat:

  • the following symptoms in people 7 years of age or older with narcolepsy:
    • sudden onset of weak or paralyzed muscles (cataplexy)
    • excessive daytime sleepiness (EDS)
  • idiopathic hypersomnia (IH) in adults.

Important Safety Information

WARNING: Taking XYWAV with other central nervous system (CNS) depressants such as medicines used to make you or your child fall asleep, including opioid analgesics, benzodiazepines, sedating antidepressants, antipsychotics, sedating anti-epileptic medicines, general anesthetics, muscle relaxants, alcohol, or street drugs, may cause serious medical problems, including trouble breathing (respiratory depression), low blood pressure (hypotension), changes in alertness (drowsiness), fainting (syncope), and death.

The active ingredient of XYWAV is a form of gamma-hydroxybutyrate (GHB). Abuse or misuse of illegal GHB alone or with other drugs that cause changes in alertness (or consciousness) has caused serious side effects. These effects include seizures, trouble breathing (respiratory depression), changes in alertness (drowsiness), coma, and death. Call your doctor right away if you or your child has any of these serious side effects.

Because of these risks, you have to go through the XYWAV and XYREM REMS to have your or your child's prescription for XYWAV filled.

Do not take XYWAV if you take or your child takes other sleep medicines or sedatives (medicines that cause sleepiness), drinks alcohol, or has a rare problem called succinic semialdehyde dehydrogenase deficiency.

Keep XYWAV in a safe place to prevent abuse and misuse. Selling or giving away XYWAV may harm others, and is against the law. Tell your doctor if you have ever abused or been dependent on alcohol, prescription medicines, or street drugs.

Anyone who takes XYWAV should not do anything that requires them to be fully awake or is dangerous, including driving a car, using heavy machinery, or flying an airplane, for at least 6 hours after taking XYWAV. Those activities should not be done until you know how XYWAV affects you or your child.

XYWAV can cause serious side effects, including the following:

  • Breathing problems, including slower breathing, trouble breathing, and/or short periods of not breathing while sleeping (sleep apnea). People who already have breathing or lung problems have a higher chance of having breathing problems when they use XYWAV.
  • Mental health problems, including confusion, seeing or hearing things that are not real (hallucinations), unusual or disturbing thoughts (abnormal thinking), feeling anxious or upset, depression, thoughts of killing yourself or trying to kill yourself, increased tiredness, feelings of guilt or worthlessness, or difficulty concentrating. Tell your doctor if you or your child have or had depression or have tried to harm yourself or themselves. Call your doctor right away if you have or your child has symptoms of mental health problems or a change in weight or appetite.
  • Sleepwalking. XYWAV can cause sleepwalking, which can cause injuries. Call your doctor if this occurs.

The most common side effects of XYWAV in adults include nausea, headache, dizziness, anxiety, insomnia, decreased appetite, excessive sweating (hyperhidrosis), vomiting, diarrhea, dry mouth, parasomnia (a sleep disorder that can include abnormal dreams, abnormal rapid eye movement (REM) sleep, sleep paralysis, sleep talking, sleep terror, sleep-related eating disorder, sleepwalking, and other abnormal sleep-related events), somnolence, fatigue, and tremor.

The most common side effects of XYREM (which also contains oxybate like XYWAV) in children include nausea, bedwetting, vomiting, headache, weight decrease, decreased appetite, dizziness, and sleepwalking.

XYWAV can cause physical dependence and craving for the medicine when it is not taken as directed. These are not all the possible side effects of XYWAV.

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

Please see full Prescribing Information, including BOXED Warning, and Medication Guide.

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