TY - JOUR
T1 - Effect of buprenorphine weekly depot (CAM2038) and hydromorphone blockade in individuals with opioid use disorder
T2 - A randomized clinical trial
AU - Walsh, Sharon L.
AU - Comer, Sandra D.
AU - Lofwall, Michelle R.
AU - Vince, Bradley
AU - Levy-Cooperman, Naama
AU - Kelsh, Debra
AU - Coe, Marion A.
AU - Jones, Jermaine D.
AU - Nuzzo, Paul A.
AU - Tiberg, Fredrik
AU - Sheldon, Behshad
AU - Kim, Sonnie
N1 - Publisher Copyright:
© 2017 American Medical Association. All rights reserved.
PY - 2017/9
Y1 - 2017/9
N2 - Importance: Buprenorphine is an efficacious, widely used treatment for opioid use disorder (OUD). Daily oral transmucosal formulations can be associated with misuse, diversion, and nonadherence; these limitations may be obviated by a sustained release formulation. Objective: To evaluate the ability of a novel, weekly, subcutaneous buprenorphine depot formulation, CAM2038, to block euphorigenic opioid effects and suppress opioid withdrawal in non-treatment-seeking individuals with OUD. Design, Setting, and Participants: This multisite, double-blind, randomized within-patient study was conducted at 3 controlled inpatient research facilities. It involved 47 adults with DSM-V moderate-to-severe OUD. The study was conducted from October 12, 2015 (first patient enrolled), to April 21, 2016 (last patient visit). Interventions: A total of five 3-day test sessions evaluated the response to hydromorphone (0, 6, and 18mg intramuscular in random order; 1 dose/session/day). After the first 3-day session (ie, qualification phase), participants were randomized to either CAM2038 weekly at 24mg (n = 22) or 32mg (n = 25); the assigned CAM2038 dose was given twice, 1 week apart (day 0 and 7). Four sets of sessions were conducted after randomization (days 1-3, 4-6, 8-10, and 11-13). Main Outcomes and Measures: The primary end pointwas maximum rating on the visual analog scale for drug liking. Secondary end points included other visual analog scale (eg, high and desire to use), opioid withdrawal scales, and physiological and pharmacokinetic outcomes. Results: A total of 46 of 47 randomized participants (mean [SD] age, 35.5 [9] years; 76% male [n = 35]) completed the study. Both weekly CAM2038 doses produced immediate and sustained blockade of hydromorphone effects (liking maximum effect, CAM2038, 24mg: effect size, 0.813; P < .001, and CAM2038, 32mg: effect size, 0.753; P < .001) and suppression of withdrawal (Clinical Opiate Withdrawal Scale, CAM2038, 24mg: effect size, 0.617; P < .001, and CAM2038, 32mg: effect size, 0.751; P < .001). CAM2038 produces a rapid initial rise of buprenorphine in plasma with maximum concentration around 24 hours, with an apparent half-life of 4 to 5 days and approximately 50% accumulation of trough concentration from first to second dose (trough concentration = 0.822 and 1.23 ng/mL for weeks 1 and 2, respectively, with 24mg; trough concentration = 0.993 and 1.47 ng/mL for weeks 1 and 2, respectively, with 32mg). Conclusions and Relevance: CAM2038 weekly, 24 and 32mg, was safely tolerated and produced immediate and sustained opioid blockade and withdrawal suppression. The results support the use of this depot formulation for treatment initiation and stabilization of patients with OUD, with the further benefit of obviating the risk for misuse and diversion of daily buprenorphine while retaining its therapeutic benefits.
AB - Importance: Buprenorphine is an efficacious, widely used treatment for opioid use disorder (OUD). Daily oral transmucosal formulations can be associated with misuse, diversion, and nonadherence; these limitations may be obviated by a sustained release formulation. Objective: To evaluate the ability of a novel, weekly, subcutaneous buprenorphine depot formulation, CAM2038, to block euphorigenic opioid effects and suppress opioid withdrawal in non-treatment-seeking individuals with OUD. Design, Setting, and Participants: This multisite, double-blind, randomized within-patient study was conducted at 3 controlled inpatient research facilities. It involved 47 adults with DSM-V moderate-to-severe OUD. The study was conducted from October 12, 2015 (first patient enrolled), to April 21, 2016 (last patient visit). Interventions: A total of five 3-day test sessions evaluated the response to hydromorphone (0, 6, and 18mg intramuscular in random order; 1 dose/session/day). After the first 3-day session (ie, qualification phase), participants were randomized to either CAM2038 weekly at 24mg (n = 22) or 32mg (n = 25); the assigned CAM2038 dose was given twice, 1 week apart (day 0 and 7). Four sets of sessions were conducted after randomization (days 1-3, 4-6, 8-10, and 11-13). Main Outcomes and Measures: The primary end pointwas maximum rating on the visual analog scale for drug liking. Secondary end points included other visual analog scale (eg, high and desire to use), opioid withdrawal scales, and physiological and pharmacokinetic outcomes. Results: A total of 46 of 47 randomized participants (mean [SD] age, 35.5 [9] years; 76% male [n = 35]) completed the study. Both weekly CAM2038 doses produced immediate and sustained blockade of hydromorphone effects (liking maximum effect, CAM2038, 24mg: effect size, 0.813; P < .001, and CAM2038, 32mg: effect size, 0.753; P < .001) and suppression of withdrawal (Clinical Opiate Withdrawal Scale, CAM2038, 24mg: effect size, 0.617; P < .001, and CAM2038, 32mg: effect size, 0.751; P < .001). CAM2038 produces a rapid initial rise of buprenorphine in plasma with maximum concentration around 24 hours, with an apparent half-life of 4 to 5 days and approximately 50% accumulation of trough concentration from first to second dose (trough concentration = 0.822 and 1.23 ng/mL for weeks 1 and 2, respectively, with 24mg; trough concentration = 0.993 and 1.47 ng/mL for weeks 1 and 2, respectively, with 32mg). Conclusions and Relevance: CAM2038 weekly, 24 and 32mg, was safely tolerated and produced immediate and sustained opioid blockade and withdrawal suppression. The results support the use of this depot formulation for treatment initiation and stabilization of patients with OUD, with the further benefit of obviating the risk for misuse and diversion of daily buprenorphine while retaining its therapeutic benefits.
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U2 - 10.1001/jamapsychiatry.2017.1874
DO - 10.1001/jamapsychiatry.2017.1874
M3 - Article
C2 - 28655025
AN - SCOPUS:85029144376
SN - 2168-622X
VL - 74
SP - 894
EP - 902
JO - JAMA Psychiatry
JF - JAMA Psychiatry
IS - 9
ER -