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Sodium Oxybate

Natrii oxybutyras

For medical students2 min readUpdated 2026-10-10

Sodium oxybate is a non-inhalation general anesthetic whose chemical structure is closely related to gamma-aminobutyric acid (GABA), a principal inhibitory neurotransmitter. The drug features a dose-dependent effect, a slow onset of the surgical anesthesia stage, and pronounced antihypoxic properties.

Chemical affinityStructurally similar to gamma-aminobutyric acid (GABA).
Onset of actionThe surgical stage develops slowly (30–40 minutes after intravenous administration).
Tissue protectionIncreases tissue resistance to hypoxia.
DurationLong-acting — from 2 to 4 hours after a single dose.

Pharmacodynamics and Dose-Dependent Effects

The effect of sodium oxybate on the central nervous system is strictly dose-dependent. In terms of anesthetic potency, it is inferior to thiopental sodium, but it possesses several unique characteristics related to its structural similarity to GABA.

Pharmacokinetics and Characteristics of Anesthesia

The drug has a specific profile of onset and maintenance of anesthesia. Due to its pharmacokinetic properties, it penetrates brain tissue extremely slowly.

  1. Onset of effect. Upon intravenous administration, the surgical stage of anesthesia is reached only after 30–40 minutes.
  2. Absence of the excitation stage. Like other non-inhalation anesthetics, sodium oxybate does not cause motor or verbal agitation during induction.
  3. Myorelaxation. Anesthesia occurs against the background of pronounced muscle relaxation.
  4. Antihypoxic action. One of the most important properties of the drug is its ability to increase the resistance of the body's cells and tissues to oxygen deprivation (hypoxia).
  5. Duration. The effect is prolonged, lasting for 2 to 4 hours after a single administration.

Clinical Application and Routes of Administration

The drug can be administered via several routes: intravenously, rectally, and orally. Due to its wide spectrum of pharmacological effects, it is used in various fields of medicine.

In anesthesiology and critical care medicine:

In psychiatric practice:

Mnemonic

To remember the main properties of the drug, use the rule «GABA»: Gastro/general hypoxia reduction, Anesthesia without excitation, Body relaxation (myorelaxation), Analog of GABA, stops psychoses.

Frequently asked questions

What is the molecular mechanism of action of sodium oxybate?

The mechanism of action of sodium oxybate is associated with the activation of the gamma-aminobutyric acid (GABA) system. The drug is close to GABA in chemical structure and is classified among GABA precursors. For sedative substances, including sodium oxybate, the mechanism is identical to ethanol, general anesthetics, and many antiepileptic drugs.

What side effects are characteristic of sodium oxybate?

For sodium oxybate and other GABAergic sedative agents, undesirable risks and phenomena include:

  • Intravenous administration carries risks of respiratory depression, psychological dependence, and tolerance;
  • Regular intake of sedatives leads to cross-tolerance to all GABAergic drugs;
  • Sedative withdrawal syndrome is similar to alcohol withdrawal syndrome;
  • Co-administration of sedatives and alcohol potentiates their effects mutually.
What are the contraindications to prescribing sodium oxybate?

The primary contraindication to prescribing sodium oxybate is myasthenia gravis. This non-inhalation anesthetic should be strictly avoided when selecting an anesthetic for patients over 18 with myasthenia gravis. Specifically, its use is not recommended during surgical interventions such as thoracoscopic thymectomy, where preference is given to propofol or sevoflurane without muscle relaxants.

What is the main difference between sodium oxybate anesthesia and inhalation anesthetics?

When using sodium oxybate, the excitation stage is completely absent, which is a common feature of non-inhalation anesthetics. However, the surgical stage develops very slowly — within 30–40 minutes.

What is the duration of surgical anesthesia after a single injection?

The drug is long-acting: the surgical stage of anesthesia after a single administration lasts from 2 to 4 hours.

Is sodium oxybate stronger than thiopental sodium?

No, in terms of anesthetic potency and activity, it is inferior to thiopental sodium.

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