Rhesus monkeys develop physical dependence on THC with daily use
Rhesus monkeys given THC twice daily developed clear physical dependence, showing a 20-fold increase in activity when withdrawal was triggered, while monkeys given THC only every 3 days did not.
Quick Facts
What This Study Found
Chronic THC (1 mg/kg every 12 hours) produced dependence: rimonabant-precipitated withdrawal caused up to 20-fold increase in home-cage activity. Intermittent THC (0.1 mg/kg every 3 days) did not produce dependence signs. Abrupt discontinuation of chronic THC caused immediate (within 24 hours) and progressive increases in activity. THC was somewhat more potent in reducing activity in the intermittent group, consistent with tolerance development in the chronic group.
Key Numbers
Chronic: 1 mg/kg every 12 hours. Intermittent: 0.1 mg/kg every 3 days. Rimonabant doses: 0.1-3.2 mg/kg. Up to 20-fold activity increase during precipitated withdrawal. Spontaneous withdrawal began within 24 hours.
How They Did This
Two groups of rhesus monkeys: one receiving chronic THC (1 mg/kg every 12 hours) and one receiving intermittent THC (0.1 mg/kg every 3 days). Home-cage activity was measured continuously. Withdrawal was assessed via rimonabant challenge and abrupt discontinuation.
Why This Research Matters
Primate models are more translatable to humans than rodent models. This study establishes clear, measurable physical dependence in primates using a simple behavioral measure.
The Bigger Picture
The contrast between chronic and intermittent dosing directly parallels the human experience where daily heavy users report withdrawal but occasional users typically do not.
What This Study Doesn't Tell Us
Animal study (primates). Activity is only one measure of withdrawal. Dose and frequency may not directly correspond to human use patterns.
Questions This Raises
- ?At what frequency of use does physical dependence begin to develop?
- ?Would a gradual taper prevent the withdrawal activity increase?
Trust & Context
- Key Stat:
- 20-fold activity increase during precipitated withdrawal
- Evidence Grade:
- Well-controlled primate study with objective behavioral measures, but animal model with limited sample size.
- Study Age:
- 2019 preclinical study.
- Original Title:
- Tolerance and dependence to Δ9-tetrahydrocannabinol in rhesus monkeys: Activity assessments.
- Published In:
- PloS one, 14(3), e0209947 (2019)
- Authors:
- Wilkerson, Jenny L(5), Schulze, David R(2), McMahon, Lance R(7)
- Database ID:
- RTHC-02349
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
Does daily cannabis use cause physical dependence?
In this primate study, monkeys receiving THC twice daily developed clear physical dependence with measurable withdrawal signs, while those receiving THC every 3 days did not.
What does THC withdrawal look like?
In these monkeys, withdrawal manifested as dramatic increases in home-cage activity (up to 20-fold), beginning within 24 hours of the last dose and increasing over time.
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Cite This Study
https://rethinkthc.com/research/RTHC-02349APA
Wilkerson, Jenny L; Schulze, David R; McMahon, Lance R. (2019). Tolerance and dependence to Δ9-tetrahydrocannabinol in rhesus monkeys: Activity assessments.. PloS one, 14(3), e0209947. https://doi.org/10.1371/journal.pone.0209947
MLA
Wilkerson, Jenny L, et al. "Tolerance and dependence to Δ9-tetrahydrocannabinol in rhesus monkeys: Activity assessments.." PloS one, 2019. https://doi.org/10.1371/journal.pone.0209947
RethinkTHC
RethinkTHC Research Database. "Tolerance and dependence to Δ9-tetrahydrocannabinol in rhesu..." RTHC-02349. Retrieved from https://rethinkthc.com/research/wilkerson-2019-tolerance-and-dependence-to
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.