Beta-meprodine
Encyclopedic
Encyclopedic
Typical encyclopedia coverage. Cross-reference for important decisions.
- 3 corroborating sources
- 3 ROAs with full dose ladders
- duration data present
- 29 combo interactions documented
- classified Research-chemical
- dose data not in PW/TripSit (unverifiable)
- 3 corroborating sources
- 3 ROAs with full dose ladders
- duration data present
- 29 combo interactions documented
- classified Research-chemical
- dose data not in PW/TripSit (unverifiable)
Aliases: Nu-1932
Summary
Very little modern clinical data exist. Early 1950s human studies suggested ฮฒ-meprodine is roughly equipotent to, or slightly less potent than, morphine by weight, while its stereoisomer ฮฑ-meprodine is several-fold stronger. Because ฮฒ-meprodine is Schedule I in the United States and internationally controlled, it is almost never encountered outside of research or illicit synthesis.
Dose Information
Dose basis. The dose figures on this page rest on decades-old human research and scattered reports rather than modern clinical data. Treat them as a rough historical orientation, not a validated range. Assume full respiratory depression, keep naloxone to hand, never dose alone, and never combine with benzodiazepines, alcohol or other depressants.
| ROA | Light | Common | Strong | Heavy |
|---|---|---|---|---|
| Oral | 5-10mg | 10-25mg | 25-40mg | 40mg+ |
| Intramuscular | 2-5mg | 5-10mg | 10-20mg | 20mg+ |
| Intravenous | 1-3mg | 3-7mg | 7-15mg | 15mg+ |
Sources
Oral
Dose ladder — Drugs.WikiIntramuscular
Dose ladder — Drugs.WikiIntravenous
Dose ladder — Drugs.WikiOnset, Duration & After-effects
| ROA | Onset | Peak | Offset | Total |
|---|---|---|---|---|
| Oral | 15-30 min | 30-60 min | 2-3 hrs | 2.75-4.5 hrs |
| Intramuscular | 1-5 min | 30-60 min | 2-3 hrs | 2.52-4.08 hrs |
| Intravenous | 1-5 min | 30-60 min | 2-3 hrs | 2.52-4.08 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 euphoria with moderate itching/nausea, mild pain relief, low sedation
Tolerance
No tolerance chart. Our decay curves for opioids were estimates, and a curve can make tolerance look longer-lasting than it is, which is the dangerous direction.
Opioid tolerance drops fast when you stop, and even a few days off can be enough, so a dose that used to be normal can now stop your breathing. Overdose deaths rise sharply after prison, detox or leaving treatment, and tolerance also falls during a hospital stay. After any break, start with a much smaller amount, try a test dose first, don't use alone, and keep naloxone within reach. Alcohol, benzodiazepines, gabapentinoids and other sedatives make an opioid overdose much more likely.
Sources: FRANK: heroin ยท National Harm Reduction Coalition ยท WHO: opioid overdose ยท Merrall et al. 2010 ยท Binswanger et al. 2007 ยท Strang et al. 2003 ยท FDA 2019: gabapentinoids and breathing
Effects
Effect glossary — · full glossary
Combinations
Cross-Check Beta-meprodine with another substanceHelpful Links
Add to PsychonautWiki Journal
The PsychonautWiki Journal logging app doesn't include every substance. To track Beta-meprodine there, start adding an ingestion, search for the name, and choose to add it as a custom substance. Paste these values:
Beta-meprodine Source: SubstanceSearch (substancesearch.com) Oral dose (mg): threshold 5 ยท light 5-10 ยท common 10-25 ยท strong 25-40 ยท heavy 40+ Intramuscular dose (mg): threshold 2 ยท light 2-5 ยท common 5-10 ยท strong 10-20 ยท heavy 20+ Intravenous dose (mg): threshold 1 ยท light 1-3 ยท common 3-7 ยท strong 7-15 ยท heavy 15+ Oral duration: onset 15-30m ยท peak 0.5-1h ยท offset 2-3h ยท total 2.75-4.5h ยท after-effects 1-3h Intramuscular duration: onset 1-5m ยท peak 0.5-1h ยท offset 2-3h ยท total 2.52-4.08h ยท after-effects 1-3h Intravenous duration: onset 1-5m ยท peak 0.5-1h ยท offset 2-3h ยท total 2.52-4.08h ยท after-effects 1-3h 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 ~ 17.5 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 Beta-meprodine? Let us know. Reports are reviewed by moderators — this is not posted publicly.