This is a Phase 1, randomized, single-site, open-label, single dose, 2-part study to evaluate the safety and PK of immediate release O2P hydrocodone (comprised of prodrug ETR028 or a blend of ETR028 and ETR029 prodrugs) against an HCBT comparator in healthy adult subjects when administered under fasted and fed conditions with naltrexone blockade. Up to approximately 78 healthy adult subjects are planned to be enrolled with each subject participating in 1 treatment period except for subjects in O2P hydrocodone treatment periods crossed over to receive O2P hydrocodone under fed conditions.
The goal of this Phase 1 clinical study is to evaluate the safety, tolerability, and pharmacokinetics (PK) of O2P (Oral Overdose Protected) hydrocodone prodrugs (ETR028 and ETR029) relative to hydrocodone bitartrate hemipentahydrate (HCBT) comparator following single oral doses in healthy adult subjects under fasted and fed conditions with naltrexone blockade