ArticlePharmacology, biochemistry, and behavior2026
Evidence of heterogeneity in the opioid withdrawal syndrome: Spontaneous and precipitated withdrawal.
Article in Pharmacology, biochemistry, and behavior, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
1 citing paper in PubMed.
- Effects of simulated and real opioid withdrawal on delay discounting for opioids and money in people who use fentanyl daily.Experimental and clinical psychopharmacology · 2026Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
7 authors.
Funding
Abstract
aimsThis study characterized the heterogeneity of opioid withdrawal by comparing naturally occurring withdrawal during opioid abstinence (spontaneous withdrawal) with abrupt, pharmacologically induced naloxone-precipitated withdrawal in adults with Opioid Use Disorder (OUD).
methodsA secondary analysis was conducted on de-identified data from 86 adults meeting DSM-5 criteria for moderate-to-severe OUD. Participants either presented in spontaneous withdrawal (n = 28) or underwent naloxone challenge to precipitate withdrawal (n = 58). Withdrawal symptoms were rated using the Wang procedure. Principal Component Analysis (PCA) of binary symptom data was performed to identify dominant patterns of symptom co-occurrence. Separate PCAs were then conducted for the withdrawal syndrome types to delineate group-specific symptom clusters.
resultsIn the combined sample, four principal components together accounted for 55.6% of the variance in withdrawal symptoms, with the highest loadings observed on autonomic (e.g., temperature change, sweating) and somatic (e.g., restlessness, yawning) domains. Subgroup analyses revealed distinct symptom-loading patterns: the spontaneous withdrawal group displayed a more pronounced autonomic profile dominated by temperature dysregulation and muscle aching, whereas the precipitated withdrawal group exhibited greater variability, with notable gastrointestinal (vomiting, stomach pain) and somatic features. Across analyses, inter-individual variability was substantial, underscoring the multidimensional nature of opioid withdrawal.
conclusionThese findings suggest spontaneous and precipitated withdrawal are distinct clinical phenomena: the former emerges gradually, the latter produces diverse, acute symptoms, though both display heterogeneity. Moreover, relying solely on naloxone-challenge paradigms for treatment development may overlook key aspects of "real-world" spontaneous withdrawal, reinforcing the importance of broader experimental models and individualized care.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.