Delorazepam
Well-documented
Well-documented
Multiple authoritative sources agree on dosing and effects.
- 3 corroborating sources
- 2 ROAs with full dose ladders
- duration data present
- 27 combo interactions documented
- PubChem toxicity data
- 3 corroborating sources
- 2 ROAs with full dose ladders
- duration data present
- 27 combo interactions documented
- PubChem toxicity data
Aliases: En, Dadumir, Nordiclazepam, Chlordesmethyldiazepam
Summary
Delorazepam is a benzodiazepine which, like other drugs in its class, possesses anxiolytic, skeletal muscle relaxant, hypnotic and anticonvulsant properties. It may have adverse effects such as drowsiness, and cognitive impairments such as short term memory impairment.
Dose Information
| ROA | Light | Common | Strong | Heavy |
|---|---|---|---|---|
| Oral | 0.25-0.5mg | 0.5-1.5mg | 1.5-2mg | 2-3mg+ |
| Sublingual | 0.25-0.5mg | 0.5-1.5mg | 1.5-2mg | 2-3mg+ |
Onset, Duration & After-effects
| ROA | Onset | Comeup | Peak | Offset | Total |
|---|---|---|---|---|---|
| Oral | 30-90 min | 0.5-2 hrs | 2-6 hrs | 6-18 hrs | 12-27.5 hrs |
| Sublingual | 30-90 min | 30-90 min | 2-6 hrs | 6-18 hrs | 12-27 hrs |
Effect Profile
Scores (0–10) curated from multiple sources:
- Effect keyword matching from PsychonautWiki catalog
- Weighted by importance: core (×3), major (×2), minor (×1)
Strong anxiolysis and euphoria with strong cognitive impairment, mild sedation
Tolerance
No tolerance chart. Our decay curves for these drugs were estimates, and a curve can make tolerance look longer-lasting than it is, which is the dangerous direction.
How fast tolerance to these drugs fades after a break has not been measured well enough to draw, so don't count on a dose you used to take still being safe: after time off, start with a much smaller amount and don't use alone. Mixing sedatives with each other, with alcohol or with opioids sharply raises the risk of a fatal overdose. If you've been using regularly, don't stop suddenly: withdrawal from benzodiazepines, alcohol or GHB/GBL can cause seizures or delirium, so get medical help to cut down gradually.
Sources: FRANK: benzodiazepines · Alcohol and Drug Foundation: GHB · FDA 2020: benzodiazepine boxed warning · FDA 2019: gabapentinoids and breathing · NHS: alcohol use disorder
Effects
Effect glossary — · full glossary
Combinations
Cross-Check Delorazepam with another substanceHelpful Links
Add to PsychonautWiki Journal
The PsychonautWiki Journal logging app doesn't include every substance. To track Delorazepam there, start adding an ingestion, search for the name, and choose to add it as a custom substance. Paste these values:
Delorazepam Source: SubstanceSearch (substancesearch.com) Oral dose (mg): light 0.25-0.5 · common 0.5-1.5 · strong 1.5-2 · heavy 2-3+ Sublingual dose (mg): threshold 0.125 · light 0.25-0.5 · common 0.5-1.5 · strong 1.5-2 · heavy 2-3+ Oral duration: onset 0.5-1.5h · come-up 0.5-2h · peak 2-6h · offset 6-18h · total 12-27.5h · after-effects 72h Sublingual duration: onset 0.5-1.5h · come-up 0.5-1.5h · peak 2-6h · offset 6-18h · total 12-27h · after-effects 72h Note: ranges are harm-reduction guidance, not a prescription. Start low, go slow, and test your substances.
Tip: for quicker logging you can also add a Custom Unit in the app, e.g. common dose ~ 1 mg (Oral).
The app keeps custom substances simple, so the full dose ranges live in the description text above. Ranges are harm-reduction guidance, not a prescription.
Report an issue or suggest an edit
Spotted incorrect or dangerous information, have a correction, a new study, or a useful addition for Delorazepam? Let us know. Reports are reviewed by moderators — this is not posted publicly.