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Related Experiment Videos

Naltrexone renders one-session exposure therapy less effective: a controlled pilot study.

Andrea T Kozak1, C Richard Spates, Dennis E McChargue

  • 1Western Michigan University, Kalamazoo, MI, USA. akozak@northwestern.edu <akozak@northwestern.edu>

Journal of Anxiety Disorders
|May 2, 2006
PubMed
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Naltrexone reduced tolerance to exposure therapy in specific phobia patients, suggesting the opioid system plays a role in fear reduction during treatment.

Area of Science:

  • Psychology
  • Neuroscience
  • Pharmacology

Background:

  • In vivo exposure therapy is a leading treatment for specific phobias.
  • The endogenous opioid system is hypothesized to mediate the rapid efficacy of exposure therapy.

Purpose of the Study:

  • To investigate the effect of naltrexone on fear and avoidance in specific phobia patients undergoing exposure therapy.
  • To explore the role of the endogenous opioid system in exposure treatment outcomes.

Main Methods:

  • 15 participants with specific phobia received one-session in vivo exposure treatment.
  • Participants were randomized to receive naltrexone, placebo, or no drug.
  • Behavioral avoidance and fear ratings were measured over time.

Main Results:

Related Experiment Videos

  • The naltrexone group showed significantly less tolerance (Behavioral Avoidance Index) to the feared stimulus compared to placebo and no-drug groups.
  • Fear ratings were significantly higher in the naltrexone group compared to the placebo group over time.
  • These findings suggest naltrexone impairs fear reduction during exposure therapy.

Conclusions:

  • The endogenous opioid system is implicated as a biological mechanism underlying behavioral changes in exposure therapy for specific phobia.
  • Naltrexone's effects support the involvement of opioid pathways in fear extinction and avoidance reduction.
  • Further research can explore pharmacological interventions targeting the opioid system to enhance exposure therapy.