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Acute bupropion and dextromethorphan effects on remifentanil self-administration in low and high responding rats adjusted for remifentanil self-administration during the treatment-free sessions following each drug treatment session. The data are the number of remifentanil infusions per session with treatments including vehicle minus the number of remifentanil infusions per session without treatments following each treatment session (mean ± sem). (N = 14)
