Does Prolonged Naltrexone Therapy Alter the Rewarding Nature of Exercise, Socialization, and Eating? A Narrative Review
Bibliographic record
Abstract
Introduction: Naltrexone is an opioid receptor antagonist prescribed for alcohol use disorder and opioid use disorder. Naltrexone has a high affinity for the mu-opioid receptors, which are the primary binding site of beta-endorphin. Beta-endorphin is an endogenous opioid that functions as the mediator of behavioral reward and reinforcement. Antagonism of the mu-opioid receptors with naltrexone improves certain outcomes in patients with substance use disorder but may alter the positive endogenous reinforcement associated with naturally rewarding and healthy activities including exercising, socializing, and eating. Discussion: In this paper, we review medical literature exploring the potential negative effects of chronic naltrexone therapy on healthy lifestyle modification. Conclusion: Although the data is preliminary, there exists a possibility that naltrexone therapy may adversely impact the endogenous reward system associated with health promoting activities. Relevance: Mortality amongst subjects with substance use disorder has increased to epidemic proportions since fentanyl became widely available. Until relatively recently, behavior modification and Twelve Step programs have been the cornerstones of recovery from substance use disorder. Previous reports have confirmed that exercise, positive social networking, and proper nutrition are important adjunctive therapies in early recovery. The possibility exists that the naturally occurring endorphin mediated reward of these activities may be adversely impacted by naltrexone therapy. Further investigation is warranted to determine whether long-term naltrexone therapy is associated with decreased healthy behaviors and if dose modifications such as low dose or an intermittent dosing scheduling could attenuate this possible unintended consequence of therapy.
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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 | 0.001 | 0.004 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 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".