Sodium oxybate, marketed as Xyrem, is a prescription oral solution containing 500 mg/ml of the active ingredient sodium oxybate. It is specifically indicated for the treatment of narcolepsy with cataplexy in adult patients, addressing symptoms such as excessive daytime sleepiness and sudden muscle weakness.
About Sodium Oxybate Tablets
Sodium oxybate is a central nervous system (CNS) depressant used primarily to manage symptoms of narcolepsy. Narcolepsy is a chronic sleep disorder characterized by uncontrollable episodes of falling asleep during the daytime, often accompanied by cataplexy—sudden, temporary loss of muscle tone triggered by emotions like laughter or surprise. This medication helps consolidate nighttime sleep, thereby reducing daytime sleepiness and cataplexy attacks.
The precise mechanism of sodium oxybate is not fully understood, but it is believed to bind to receptors on brain cells, promoting delta (slow-wave) sleep. This enhances deep sleep stages at night, leading to improved alertness during the day. Clinical studies demonstrate its efficacy: in one trial, a 9 g daily dose reduced weekly cataplexy attacks from 23.5 to 8.7, compared to a placebo reduction of 4.3.
Key Facts
- Medicine name: Xyrem (sodium oxybate)
- Type: Oral solution (500 mg/ml)
- Used for: Narcolepsy with cataplexy in adults
- Controlled substance: Schedule III due to potential for misuse and dependence
- Distribution: Available only through restricted REMS programs like Xyrem and Lumryz REMS
When Not to Use Sodium Oxybate
Sodium oxybate is contraindicated in patients with succinic semialdehyde dehydrogenase deficiency, a rare genetic disorder. It should not be used concurrently with alcohol or other CNS depressants, as this can potentiate respiratory depression, coma, or death. Caution is advised in individuals with respiratory issues, heart failure, or hypertension due to sodium content (approximately 1 g per 4.5 g dose).
Dosage
Treatment begins with a low dose, titrated gradually to minimize side effects. The standard regimen involves two nightly doses: one at bedtime and a second 2.5 to 4 hours later. Maximum daily dose is 9 g.
| Patient Weight/Group | Initial Dose | Titration | Maintenance |
|---|---|---|---|
| Adults ≥16 years | 2.25 g (4.5 ml) per dose | Increase 1.5 g/dose weekly | 4.5–9 g/night, divided |
| Children ≥7 years (alternative form) | Weight-based | Gradual increase | Up to 9 g/night |
Doses are measured using provided syringes and diluted in 60 ml water. Administer on an empty stomach, at least 2 hours after eating. Missed second dose should be skipped; resume normal schedule next night.
How and When to Take Sodium Oxybate
Prepare the solution immediately before use by diluting the prescribed volume in 60 ml water. The solution is stable for 24 hours at room temperature but discard unused portions. Take the first dose while sitting up in bed, and the second without sitting up to avoid injury from sleep behaviors.
- Bedtime dose: After at least 2 hours without food
- Second dose: Set alarm for 2.5–4 hours later
- Storage: Refrigerate unopened bottles; room temperature after opening (up to 14 days)
- Travel: Use cooler pack for refrigeration needs
Avoid activities requiring alertness post-dose, as effects persist 5–9 hours.
Common Questions About Sodium Oxybate
How long does sodium oxybate take to work?
Improvements in cataplexy may appear within weeks, with full effects on sleepiness after 12 weeks. Consistent use is essential.
Can you drink alcohol with sodium oxybate?
No—alcohol is strictly prohibited, as it heightens risks of severe CNS depression.
Side Effects
Most side effects are mild and diminish over time. Serious risks include respiratory depression and sleepwalking.
Common Side Effects
- Nausea (20%)
- Dizziness (18%)
- Headache (15%)
- Vomiting (8%)
- Bedwetting (7%)
Serious Side Effects
| Category | Symptoms | Action |
|---|---|---|
| CNS Depression | Slow/shallow breathing, confusion, unresponsiveness | Seek emergency help |
| Sleep Behaviors | Sleepwalking, sleep-driving, hallucinations | Stop medication, contact doctor |
| Mental Health | Anxiety, depression, suicidal thoughts | Immediate medical attention |
| Respiratory | Shortness of breath, wheezing | Call provider |
Monitor for dependence with long-term use.
How to Cope with Side Effects
- Nausea: Take with small sips of water; antiemetics if prescribed
- Dizziness: Rise slowly; avoid driving
- Bedwetting: Limit evening fluids; use protective bedding
- Sleepwalking: Lock doors/windows; ensure safe sleep environment
Pregnancy and Breastfeeding
Data are limited; potential risks to fetus include CNS effects. Use only if benefits outweigh risks. Not recommended during breastfeeding due to excretion in milk.
Other Medicines and Sodium Oxybate
Avoid CNS depressants (benzodiazepines, opioids, alcohol). Sodium content may interact with low-sodium diets or heart medications. Inform doctor of all drugs.
General Advice About Sodium Oxybate
Xyrem is part of a strict REMS program due to its relation to GHB, a substance of abuse. Available only from certified pharmacies; monthly certifications required. Store securely to prevent misuse.
Frequently Asked Questions (FAQs)
Q: What is narcolepsy?
A: Narcolepsy is a sleep disorder causing excessive daytime sleepiness and cataplexy, where strong emotions trigger muscle weakness.
Q: Is sodium oxybate addictive?
A: It has dependence potential; follow prescribed dosing and taper if discontinuing.
Q: Can children take it?
A: Approved for ages 7+ in some formulations under medical supervision.
Q: What if I miss a dose?
A: Skip the second dose if missed; do not double up.
Q: How is it different from Lumryz?
A: Lumryz is extended-release; both under REMS.
References
- Xyrem | European Medicines Agency (EMA) — European Medicines Agency. 2023-05-15. https://www.ema.europa.eu/en/medicines/human/EPAR/xyrem
- Xyrem (sodium oxybate) Information — U.S. Food and Drug Administration. 2024-02-10. https://www.fda.gov/drugs/postmarket-drug-safety-information-patients-and-providers/xyrem-sodium-oxybate-information
- Sodium oxybate – StatPearls — NCBI Bookshelf. 2023-11-20. https://www.ncbi.nlm.nih.gov/books/NBK562283/
- Sodium oxybate (oral route) — Mayo Clinic. 2024-01-05. https://www.mayoclinic.org/drugs-supplements/sodium-oxybate-oral-route/description/drg-20067727
- Sodium oxybate: Uses, Interactions, Mechanism of Action — DrugBank. 2023-12-01. https://go.drugbank.com/drugs/DB09072
- Sodium Oxybate: MedlinePlus Drug Information — MedlinePlus. 2024-03-12. https://medlineplus.gov/druginfo/meds/a605032.html
