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Monkey motor stimulation and altered social behavior during chronic methadone administration
Psychopharmacologia
|August 21, 1975
Summary
Methadone maintenance in primates showed stimulant properties, reduced social interactions, and decreased appetite, impacting behavior and weight. These findings offer insights into methadone
Area of Science:
- Pharmacology
- Behavioral Neuroscience
- Primate Studies
Background:
- Methadone is widely used for opioid addiction treatment.
- Understanding its behavioral effects in controlled settings is crucial.
- Primate models offer insights into drug effects on complex behaviors.
Purpose of the Study:
- To evaluate chronic methadone's impact on locomotor, social, and eating behaviors in primates.
- To simulate conditions found in clinical methadone maintenance.
- To compare primate responses to known human effects.
Main Methods:
- Administered daily oral methadone to Macaca radiata monkeys.
- Monitored locomotor activity, social interactions, weight, and food intake.
- Measured plasma methadone levels to approximate human clinical concentrations.
Main Results:
- Methadone exhibited mixed daytime stimulant and sedative effects, with initial stimulation.
- Nighttime activity decreased during methadone administration.
- Social association behaviors were reduced, but dominance, submission, and sexual behaviors remained unchanged.
- Food intake, weight, and work for food reinforcement decreased significantly.
Conclusions:
- Chronic methadone administration in primates has significant stimulant properties.
- Methadone impairs key social behaviors and reduces the reinforcing value of food.
- Findings provide a comparative basis for understanding methadone's effects in humans.