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Experimental: 6 outpatient sessions

This is a within-subject study so all session procedures will be identical, however the specific medications provided as part of the double-blinded study medications may change during each session. During each session, which will last up to 8 hours a day and will be conducted on an outpatient basis, participants will be asked to complete standardized pain testing procedures, as well as questionnaires about how they are feeling and to complete cognitive tasks.

Drug: Within-subject test of blinded study medications

This is a double-blind within-subject Phase II trial. As such, study medications must remain blinded. Participants may receive a dose of medication from one or more of the following categories: prescription stimulants, prescription benzodiazepines, prescription opioids, prescription cannabinoids, over-the-counter medications, or placebo (sugar pill). This study will use a within-subject design, and all participants will serve as their own control. Study medication administration will be randomized within each participant.