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Escalation And Reinstatement Of Fentanyl Self-Administration In Male And Female Rats, Samantha G. Malone

Theses and Dissertations--Psychology

Escalation of intake and craving are two DSM-5 hallmark symptoms of opioid use disorder (OUD). Objectives: This study determined if escalation measured by long access (LgA) self-administration and craving measured by reinstatement are related. Adult male and female Sprague-Dawley rats were trained to self-administer (SA) fentanyl across 7 daily 1-h sessions, followed by 21 SA sessions of either 1- or 6-h duration. Assignment to short access (ShA) and long access (LgA) groups was randomly determined for both males and females. Following 14 1-h extinction sessions, Experiment 1 assessed reinstatement induced by either fentanyl (10 or 30 μg/kg) or yohimbine (1 …