Participants were given no explicit instructions regarding their drinking behavior for Days 1 – 5 but were required to abstain completely on Day 6 and the morning of day 7. On Day 6, subjects were assessed for alcohol withdrawal using the Clinical Institute Withdrawal Assessment for Alcohol – Revised (Sullivan et al., 1989) (highest score was 3) and urine sample was collected to ascertain riboflavin levels for medication compliance. A 6-Day version of the timeline follow-back interview (which recorded alcohol consumption during the medication period) was done. On that evening, they underwent an fMRI brain scan paradigm (Myrick et al., 2008) that will be reported separately.
