The purpose of this study is to assess the abuse potential of CL-108 tablets, including the abuse deterrent effects of promethazine, following oral administration, relative to hydrocodone/acetaminophen (APAP) tablets and placebo in non-dependent, recreational opioid users; to assess the cognitive and behavioral effects of CL-108 tablets following oral administration relative to hydrocodone/APAP tablets and placebo in non-dependent, recreational opioid users; and to assess the safety of orally administered CL-108 tablets relative to hydrocodone/APAP tablets and placebo in non-dependent, recreational opioid users.