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Rremifentanil self-administration during the treatment-free sessions following each drug treatment session. The data are the number of remifentanil infusions per session (mean ± sem). (N = 14)
| Dextromenthorphan (mg/kg) | |||
|---|---|---|---|
| Bupropion (mg/kg) | 0 | .3.3 | 10 |
| 0 | 59.9±8.6 | 52.1±8.3 | 63.6±7.1 |
| 10 | 60.1±8.5 | 61.2±8.5 | 52.8±6.4 |
| 30 | 62.7±7.1 | 61.6±6.2 | 62.3±7.0 |
