Evaluation of abuse potential in recreational abusers of Hydrocodone Bitartrate and Acetaminophen versus NORCO®.

Inclusion Criteria:

1. Healthy male or female subjects 18 to 55 years of age.
2. Opioid users who have used opioids for recreational purposes and or is an avid opioid user.

Exclusion Criteria:

1. Substance or alcohol dependence (excluding nicotine and caffeine) within the past 2 years.
2. Heavy smoker and/or is unable to abstain from smoking or unable to abstain from the use of prohibited nicotine containing products for at least 6 hours during the in-clinic periods.
3. Difficulty swallowing large number of pills.
4. Subjects who have had a tattoo or body piercing.