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| Session 1 | Session 2 | Session 3 | Session 4 | |
|---|---|---|---|---|
| Capsule | Placebo | Placebo | 0.75 mg/kg MDMA | 1.5 mg/kg MDMA |
| Intranasal spray | Placebo | 20 or 40 IU Oxytocin | Placebo | Placebo |
The order of drugs was randomized across subjects. All participants received both doses of MDMA and placebo, and one active oxytocin dose (20 IU (N=43) or 40 IU (N=22)).
