A Study to Evaluate the Pharmacokinetics of the Hydrocodone Extended-Release Tablet (CEP-33237) in Subjects With Normal Hepatic Function and Subjects With Moderate Hepatic Impairment

The purpose of this study is: 1. To assess the pharmacokinetics of the hydrocodone bitartrate extended-release tablet in subjects with moderate hepatic impairment and in subjects with normal hepatic function. 2. To assess the safety and tolerability of the hydrocodone bitartrate extended-release tablet in subjects with moderate hepatic impairment and in subjects with normal hepatic function.