Hydrocodone Bitartrate controlled release (HC-CR) Disease area studied Abbreviated title Phase Study ID Registry database Study results Plain language summary Publication (if available) Chronic Pain Phase 3 Study of Hydrocodone Bitartrate Controlled-release Capsules in Subjects With Chronic Low Back Pain Phase 3 ZX002-0801 Completed NCT01081912 LINK Chronic Pain Long-Term Study of Hydrocodone Bitartrate Controlled-release Capsules in Subjects With Chronic Pain Phase 3 ZX002-0802 Completed NCT01115569 LINK