Oxybato de sodio
Xyrem
Revisado por pares por Sid DajaniÚltima actualización por Michael Stewart, MRPharmSÚltima actualización 26 Jul 2022
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Take sodium oxybate two times each night.
Take your first dose as you go to bed and the second dose 2½-4 hours later.
Sodium oxybate will make you feel sleepy. If you still feel sleepy the next day, do not drive and do not use tools or machines.
De un vistazo
Sodium oxybate is a medicine for narcolepsy with cataplexy.
It helps with excessive daytime sleepiness and cataplexy symptoms.
You take it as an oral liquid, split into two doses at bedtime and a few hours later.
Take it at least 2-3 hours after eating, mixed with water.
Do not drive for at least six hours after taking it, and avoid alcohol.
About sodium oxybate
Tipo de medicamento | Central nervous system depressant |
Usado para | Narcolepsy with cataplexy |
También llamado | Xyrem® |
Disponible como | Medicamento líquido oral |
Narcolepsia is a problem which affects your sleep. Disturbed night-time sleep makes you feel very tired and drowsy during the daytime, and you can also have times where you fall asleep during the day without any warning. Many people with narcolepsy also have cataplexy. Cataplexy is a condition in which you suddenly lose control over some of your muscles.
Sodium oxybate is used to treat narcolepsy when cataplexy is also a problem. It helps with excessive daytime sleepiness as well as helping the symptoms of cataplexy. It is sometimes used in combination with other medicines for narcolepsy.
Before taking sodium oxybate
Some medicines are not suitable for people with certain conditions, and sometimes a medicine may only be used if extra care is taken. For these reasons, before you start taking sodium oxybate it is important that your doctor or pharmacist knows:
Si estás embarazada, intentando tener un bebé o amamantando.
Si tienes epilepsia.
If you have any problems with your heart or your breathing, or if you have high blood pressure.
If you have problems with your liver or kidneys.
If you are on a 'low sodium' diet for medical reasons.
If you have ever had a depressive illness.
If you have porphyria, a rare inherited blood disorder.
If you have ever had a drug addiction problem.
Si está tomando otros medicamentos. Esto incluye cualquier medicamento que esté tomando y que esté disponible para comprar sin receta, así como medicamentos herbales y complementarios.
Si alguna vez has tenido una reacción alérgica a un medicamento.
How to take sodium oxybate
Before you start this treatment, read the manufacturer's printed information leaflet from inside your pack. The leaflet will give you more information about sodium oxybate and a full list of side-effects which you may experience from taking it.
Take sodium oxybate exactly as your doctor tells you to. When starting this treatment your doctor will give you a small dose and then gradually increase it. This is to make sure you have the dose that helps your condition and avoids any unwanted symptoms.
It is taken in two doses - the first dose taken as you go to bed, and the second dose 2½-4 hours later. You should prepare both doses before you retire to bed, and you may need to set an alarm to make sure you wake up to take the second dose.
Only use the special child-resistant dosing cups provided with Xyrem® for storing your diluted doses.
Sit upright whilst taking your doses. Take your second dose whilst still in bed and lie down again straightaway.
Food interferes with how much of this medicine is absorbed by your body, so it is important that you take sodium oxybate well after eating any food. Most doctors will recommend that it is taken at a set time each evening, at least 2-3 hours after your evening meal.
Mix each of your doses with water (see below).
If you forget to take the first dose, take it as soon as you remember and then take the second dose 2½-4 hours later. If you forget to take the second dose, do not take it when you remember but instead skip the dose completely and do not take any more until the following evening. Do not take two doses together to make up for a forgotten dose.
Instructions for using Xyrem® Oral Solution
Remove the bottle cap and the foil seal. Push the plastic adaptor into the top of the open bottle.
Inserte la jeringa en el adaptador.
Keeping the bottle upright, gently pull out the plunger of the syringe so that the solution fills the syringe to the mark which corresponds to your dose.
Remove the syringe from the bottle, and empty the liquid from the syringe into the dosing cup.
Repeat steps 2-4 to prepare your second dose.
Add 60 ml of water (about four tablespoons) to both dosing cups, and then close both of the cups with the locking caps provided.
Replace the cap on the bottle of Xyrem® Oral Solution, leaving the adapter in place. Wash the syringe with water.
Obteniendo el máximo de tu tratamiento
Keep your regular appointments with your doctor. This is so your progress can be monitored.
Treatment with sodium oxybate is usually long-term. Continue to take the medicine unless you are advised otherwise. Stopping suddenly can cause problems and your doctor may want you to reduce your dose gradually if this is necessary.
Sodium oxybate will make you sleepy, so do not drive within six hours of taking a dose. You may also continue to feel sleepy during the following day, so do not drive and do not use tools or machines if this happens, as you may put yourself and others at risk.
You should not drink alcohol while you are on sodium oxybate.
If you buy any medicines, check with a pharmacist that they are suitable for you to take with sodium oxybate. Some strong painkillers should not be taken with this medicine.
If you are having an operation or dental treatment, tell the person carrying out the treatment that you are taking this medicine.
Sodium oxybate is known to cause dependence, particularly where more than the recommended doses are taken. If you are concerned about this, you should discuss it with your doctor.
Can sodium oxybate cause problems?
Junto con sus efectos útiles, la mayoría de los medicamentos pueden causar efectos secundarios no deseados, aunque no todos los experimentan. Estos generalmente mejoran a medida que su cuerpo se adapta al nuevo medicamento, pero hable con su médico o farmacéutico si alguno de los siguientes efectos secundarios persiste o se vuelve problemático.
Very common sodium oxybate side-effects - these affect more than 1 in 10 people who take this medicine | ¿Qué puedo hacer si experimento esto? |
Sensación de mareo | Move around more slowly. Do not drive and do not use tools or machines until you feel better |
Sentirse mal (náuseas) | Stick to simple meals, avoid rich or spicy food |
Dolor de cabeza | Bebe mucha agua y pide a un farmacéutico que te recomiende un analgésico adecuado. Si los dolores de cabeza continúan, informa a tu médico |
If you experience other symptoms which you think may be due to this medicine, speak with your doctor or pharmacist.
How to store sodium oxybate
Mantenga todos los medicamentos fuera del alcance y la vista de los niños.
Almacenar en un lugar fresco y seco, lejos del calor y la luz directos.
Once a bottle has been opened it will keep for 90 days; after this time, make sure you have a fresh supply.
Diluted liquid should only be kept for 24 hours.
Información importante sobre todos los medicamentos
Información importante sobre todos los medicamentos
Nunca tome más de la dosis prescrita. Si sospecha que usted u otra persona podría haber tomado una sobredosis de este medicamento, acuda de inmediato al departamento de accidentes y emergencias de su hospital local. Lleve el envase con usted, incluso si está vacío.
Este medicamento es para ti. Nunca lo des a otras personas, incluso si su condición parece ser la misma que la tuya.
No guardes medicamentos caducados o no deseados. Llévalos a tu farmacia local, que se encargará de desecharlos por ti.
Si tienes alguna pregunta sobre este medicamento, consulta a tu farmacéutico.
Informar efectos secundarios de un medicamento o vacuna
Si experimenta efectos secundarios, puede reportarlos en línea a través de Sitio web de Yellow Card.

¿Inseguro sobre mezclar medicamentos?
Verifica posibles interacciones entre medicamentos, suplementos y alimentos antes de tomarlos juntos.
Preguntas frecuentes
What is narcolepsy and how does sodium oxybate help with it?
Narcolepsy is a sleep disorder that causes disturbed night-time sleep, leading to extreme tiredness and drowsiness during the day, and sudden sleep attacks. Many people with narcolepsy also experience cataplexy, which is a sudden loss of muscle control. Sodium oxybate is used to treat narcolepsy when cataplexy is also present. It helps reduce excessive daytime sleepiness and improves the symptoms of cataplexy.
How soon after eating can I take sodium oxybate?
Food affects how much of the medicine your body absorbs, so it's important to take sodium oxybate well after eating. Most doctors recommend taking it at a set time each evening, at least 2-3 hours after your evening meal.
What should I do if I accidentally take two doses of sodium oxybate close together?
You should never take two doses together to make up for a forgotten dose. If you forget your second dose, skip it completely and do not take any more until the following evening.
Are there any strong painkillers I should avoid while taking sodium oxybate?
Yes, some strong painkillers should not be taken with sodium oxybate. If you are buying any medicines, including painkillers, you should always check with a pharmacist to ensure they are suitable to take with sodium oxybate.
How long can an opened bottle of sodium oxybate be stored?
Once a bottle of sodium oxybate has been opened, it will keep for 90 days. After this time, you should dispose of it and use a fresh supply. Diluted liquid, once prepared, should only be kept for 24 hours.
Lecturas adicionales y referencias
- Manufacturer's PIL, Xyrem® 500 mg/ml oral solution; UCB Pharma Limited, The electronic Medicines Compendium. Dated February 2022.
- Medicamentos Completos BNF 89ª Edición; Asociación Médica Británica y Sociedad Real de Farmacia de Gran Bretaña, Londres.
Sobre el autorVer biografía completa

Michael Stewart, MRPharmS
Gerente de Revisión de Folletos de Medicamentos – Contratista, Farmacéutico
BPharm (Hons), MRPharmS
Michael es un farmacéutico comunitario que ejerce en Midlands y South Yorkshire con más de 20 años de experiencia asesorando sobre medicamentos y condiciones médicas. Tiene una sólida formación en capacitación en atención médica, habiendo producido e impartido cursos de formación para equipos de farmacia y personal de entornos de atención residencial, incluidas enfermeras. También ha contribuido a juntas asesoras de farmacia para la gestión de condiciones de baja gravedad en la comunidad.
Acerca del revisor

Sid Dajani
Sultan Dajani se graduó en la Escuela de Farmacia de Londres en 1994 y se convirtió en el miembro más joven elegido para el consejo de la Sociedad Real de Farmacia desde su fundación en 1842.
Historial del artículo
La información en esta página está escrita y revisada por pares por clínicos calificados.
Artículo también disponible en Inglés, Alemán, Español, Francés, Italiano, Portugués, Hindi, Hebreo, Árabe, y Sueco.
Próxima revisión: 24 Ene 2027
26 Jul 2022 | Última versión

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