Library

Esketamín

Esketamine is the S-enantiomer of ketamine and is FDA-approved for treatment-resistant depression when administered intranasally under medical supervision. It is approximately 4 times more potent at NMDA receptors than the R-enantiomer and approximately 2 times more potent than racemic ketamine. Side effects include dissociation, dizziness, sedation, increased blood pressure, and nausea. Contraindicated in individuals with aneurysmal vascular disease, uncontrolled hypertension, or history of psychosis. Available only through REMS program (Spravato REMS) in the US.

Esketamín molecular structure
Esketamín molecular structure diagram from the DrugsPRO substance library.

Also known as: Spravato, Ketanest s, L-ketamine

Classification

  • Chemical: Arylcyclohexylamine
  • Chemical: Medicine
  • Psychoactive: Dissociative
  • Tag: Antidepressant
  • Tag: Hallucinogen
  • Tag: Pharmaceutical

Effects

  • Pain Relief
  • Sedation
  • Analgesia
  • Physical Disconnection
  • Increased Blood Pressure
  • Nausea
  • Dissociation
  • Depersonalization
  • Derealization
  • Cognitive Euphoria
  • Motor Control Loss
  • Time Distortion
  • Visual Distortion
  • Spatial Disorientation
  • Visual Disconnection
  • Open Eye Visuals
  • Auditory Warping
  • Warping

Routes of Administration

Intranasal

Dosage

  • Threshold: ~7 mg
  • Light: 7-14 mg
  • Common: 28-56 mg
  • Strong: 56-84 mg
  • Heavy: 84 mg

Duration

  • Onset: 0.08-0.25 h
  • Comeup: 0.08-0.25 h
  • Peak: 0.33-1 h
  • Offset: 1-2 h
  • After Effects: 2-24 h

Intravenous

Dosage

  • Threshold: 0.1 mg/kg
  • Light: 0.1-0.25 mg/kg
  • Common: 0.25-0.5 mg/kg
  • Strong: 0.5–0.8 mg/kg
  • Heavy: >0.8–1 mg/kg (anesthetic-range effects possible)

Duration

  • Onset: 0.02-0.08 h
  • Comeup: 0.03-0.08 h
  • Peak: 0.17-0.5 h
  • Offset: 0.75-1.5 h
  • After Effects: 120-1440 h
  • Total Duration: 45-90 h

Intramuscular

Dosage

  • Threshold: 0.15 mg/kg
  • Light: 0.15–0.3 mg/kg
  • Common: 0.3–0.5 mg/kg
  • Strong: 0.5–0.75 mg/kg
  • Heavy: >0.75–1 mg/kg (anesthetic-range effects possible)

Duration

  • Onset: 0.03-0.17 h
  • Comeup: 0.08-0.25 h
  • Peak: 0.5-1 h
  • Offset: 1-2 h
  • After Effects: 2-24 h

Insufflated

Dosage

  • Heavy: Not recommended; risks escalate sharply mg
  • Light: 28–56 mg
  • Common: 56–84 mg (labelled max per session)
  • Strong: ≥84 mg (above label not recommended)
  • Threshold: 28 mg (1 device)

Duration

  • Onset: 5-15 h
  • Peak: 20-60 h
  • Offset: 60-120 h
  • After Effects: 120-1440 h
  • Total Duration: 60-120 h

Harm Reduction

Check interactions before mixing substances, pay attention to dose spacing and hydration, and treat all dosage guidance as approximate rather than guaranteed safe.

Sources

Substance data is aggregated from the following public harm-reduction and reference sources.

Links

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Esketamine - DrugsPRO sprievodca látky

Esketamine: Esketamine is the S-enantiomer of ketamine and is FDA-approved for treatment-resistant depression when administered intranasally under medical supervision. It is approximately 4 times more potent at NMDA receptors than the R-enantiomer and approximately 2 times more potent than racemic k

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