Xylazine Identified in the Unregulated Drug Supply in British Columbia, Canada
Bibliographic record
Abstract
ABSTRACT Objectives: Drug checking is a harm reduction intervention that provides people who use drugs with information about the substance they are intending to, or have already, used. It also functions as a way to monitor the local drug supply providing real-time alerts to the community, researchers, and decision makers. These alerts include, but are not limited to, novel adulterants detected in the drug supply. Methods: Drug samples were sent from a point-of-care drug checking service utilizing Fourier transform infrared (FTIR) spectroscopy and fentanyl immunoassay strips at two supervised consumption sites in Vancouver and Surrey, British Columbia to receive confirmatory laboratory-based testing with gas chromatography/mass spectrometry (GC/MS). Results: Between June 1, 2018 and November 30, 2018, xylazine was detected in four samples sent for confirmatory testing and co-occurred with fentanyl in all cases. Point-of-care drug checking with FTIR was unable to detect xylazine in these samples. Conclusions: Xylazine is a depressant that may potentiate certain desirable effects of opioid drugs, which may explain its presence in the unregulated drug supply. The implications of xylazine as an adulterant are unknown, but drug checking has shown to be a valuable tool in early warning for the community and healthcare providers. Objectifs: La analyse des drogues est une intervention de réduction des méfaits auprès des personnes qui consomment des drogues en fournissant des informations sur la substance qu’elles envisagent ou ont déjà consommée. Cela fonctionne également comme un moyen de surveiller l’approvisionnement local en médicaments, fournissant des alertes en temps réel à la communauté, aux chercheurs et aux décideurs. Ces alertes comprennent, mais sans s’y limiter, les nouveaux adultérants détectés dans les drogues. Méthodes: Des échantillons de drogues ont été envoyés à partir d’un service de analyse des drogues utilisant la spectroscopie infrarouge à transformée de Fourier (IRTF) et des bandelettes immunologiques de fentanyl dans deux sites de consommation supervisée à Vancouver et Surrey, en Colombie-Britannique, afin de recevoir des tests de confirmation en laboratoire avec chromatographie en phase gazeuse/spectrométrie de masse (GC/MS). Résultats: Entre le 1er juin 2018 et le 30 novembre 2018, la xylazine a été détectée dans quatre échantillons envoyés pour des tests de confirmation et coproduite avec le fentanyl dans tous les cas. La vérification des drogues au point de service par IRTF n’a pas permis de détecter la xylazine dans ces échantillons. Conclusions: La xylazine est un dépresseur qui peut potentialiser certains effets souhaitables des médicaments opioïdes, ce qui peut expliquer sa présence dans l’approvisionnement non réglementé en médicaments. Les implications de la xylazine en tant qu’adultérant sont inconnues, mais le analyse des drogues s’est révélé être un outil précieux d’alerte précoce pour la communauté et les prestataires de soins de santé.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.004 |
| Science and technology studies | 0.005 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".