Once it is determined that there is no change in the pharmacokinetics of alcohol or AZD0530, as well as no difference in behavioral or cognitive responses to alcohol in the presence of AZD0530, the investigators will begin the pilot study examining the effects of two doses of AZD0530 on behavioral measures related to alcohol self-administration following a fixed dose of alcohol in alcohol abusive or dependent heavy drinkers, and compare responses to those obtained from historical controls who were treated with placebo in Study 1. Subjects will be randomized to one of two doses of AZD0530 (50 mg/day or 125 mg/day) as a between subjects factor.