The objective of this 26-28 week study is to demonstrate that the rate of cocaine dependent subjects treated with CPP-109 vigabatrin in addition to counseling, who completely stop use of cocaine in the last 2 weeks of the study's Treatment Phase (Weeks 8 and 9) will be higher than seen in subjects treated with placebo in addition to counseling.
There are 3 Phases to this study:
* a 2-4 week Screening/Baseline Phase during which eligibility to be included in the trial will be tested;
* a 9 week Treatment Phase during which subjects will receive CPP-109 or placebo tablets in addition to counseling; and
* a 15 week Follow-up Phase, during the first 4 weeks (Weeks 10-13) of which subjects will continue to receive counseling.
