GBL
Aliases: Gamma-bl, Blue nitro, Revivarant, Renewtrient, 1,4-lactone
Summary
GBL is a prodrug rapidly converted to GHB in the body and is significantly more potent by volume than GHB. Accurate dosing with a syringe is critical as doses are measured in single milliliters. Overdose risk is high and can result in loss of consciousness, respiratory depression, and death, especially when combined with other depressants.
Dose Information
| ROA | Light | Common | Strong | Heavy |
|---|---|---|---|---|
| Oral BA ~95% | 0.3-0.9ml | 0.9-1.5ml | 1.5-3ml | 3ml+ |
Onset, Duration & After-effects
| ROA | Onset | Comeup | Peak | Offset | Total |
|---|---|---|---|---|---|
| Oral | 10-19 min | 10-30 min | 30-90 min | 1-2 hrs | 1.5-2.5 hrs |
Tolerance
Tolerance Decay
Tolerance builds rapidly with frequent redosing (days). After cessation, many users report substantial reduction within 3–7 days and near‑baseline in 1–2 weeks; heavy, prolonged use may prolong recovery. Cross‑tolerance is expected across GHB prodrugs. Data derive largely from HR orgs and user reports; interindividual variability is high.
Cross-Tolerances
Effects
Aggregated from 80 Erowid experience reports