Pharmacokinetic & Pharmacodynamic Interaction of Lofexidine and Buprenorphine in Buprenorphine Maintained Patients

Lofexidine HCl tablets titrated in ascending doses of 0.2 mg (1 tablet) QID starting at 0.4 mg (2 tablets) QID \[e.g. Day 1 0.4 mg (2 tablets) QID, Day 2 0.6 mg (3 tablets) QID, etc.\] as described in the treatment arm. Option to down-titrate to 0.2 mg (1 tablet) QID if 0.4 mg (2 tablets) QID dose not initially tolerated.

Lofexidine-matching sugar pill tablets titrated in ascending doses of 1 tablet starting at 2 tablets QID (e.g. Day 1 2 tablets QID, Day 2 3 tablets QID, etc.) as described in the treatment arm. Option to down-titrate to 1 tablet QID if 2 tablets not initially tolerated.