Abstract
Rationale
α4β2 Neuronal nicotinic receptors (NNRs) are implicated in the pathophysiology of attention-deficit/hyperactivity disorder (ADHD).
Objectives
This study examined the efficacy and safety of the α4β2 NNR partial agonist ABT-089 versus placebo in adults with ADHD.
Methods
In this multicenter, randomized, double-blind, placebo-controlled crossover study, subjects received placebo followed by ABT-089 (2 mg once daily [QD], 5 mg QD, 15 mg QD, 40 mg QD, or 40 mg twice daily [BID]), or vice versa, in a 2 × 2 crossover design. Each treatment period was 4 weeks, separated by a 2-week washout period. The primary efficacy endpoint was the Conners’ Adult ADHD Rating Scale–Investigator Rated (CAARS:Inv) total score at the end of each treatment period. Secondary outcomes based on clinician- and self-rated efficacy scales were evaluated.
Results
Of the 221 subjects enrolled, 171 met criteria for inclusion in the completers dataset for efficacy analyses. ABT-089 was superior to placebo on the CAARS:Inv total score at 40 mg QD and 40 mg BID (model-based least square mean difference from placebo: −4.33, P = 0.02; −3.02, P = 0.03, respectively). ABT-089 also demonstrated significant improvements on several secondary measures of efficacy. ABT-089 was generally safe and well tolerated. The most commonly reported adverse events (≥5%) for total ABT-089-treated subjects at rates higher than placebo were headache, upper respiratory tract infection, irritability, insomnia, and nasopharyngitis.
Conclusions
In this phase 2 crossover study, the NNR partial agonist ABT-089, at doses of 40 mg QD and 40 mg BID, was efficacious and generally well tolerated in treatment of adults with ADHD.
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Acknowledgments
This study was funded by Abbott, Abbott Park, IL (NCT 00391729; URL: http://clinicaltrials.gov/ct2/show/NCT00391729?term=M06-855&rank=1). Abbott was involved in original concepts and systematic review of existing trial evidence, the design, the choice of investigators, the control of the allocation schedule, the conduct of the trial, the collection and monitoring of data, the analysis and interpretation, and the writing and approval of this report. The authors have had full control of all primary data and agree to allow the journal to review the data if requested. The authors wish to acknowledge the following investigators for their contributions to this study: Valerie K. Arnold, M.D. (Clinical Neuroscience Solutions, Inc., Memphis, TN); Charles Dean Casat, M.D. (Carolina NeuroSolutions, LLC, Charleston, SC); Jeffrey A. Danziger, M.D. (CORE Research, Inc., Maitland, FL); Mark V. DiBuono, M.D. (Richmond Behavioral Associates, Staten Island, NY); Judith C. Fallon, M.D. (NeuroScience, Inc., Herndon, VA); C. Thomas Gualtieri, M.D. (North Carolina Neuropsychiatry, PA, Chapel Hill, NC); Cynthia Huffman, M.D. (Meridien Research, Tampa, FL); Rakesh Jain, M.D., M.P.H. (R/D Clinical Research, Inc., Lake Jackson, TX); John Mark Joyce, M.D. (Clinical Neuroscience Solutions, Inc., Jacksonville, FL); Vernon L. Kliewer, M.D. (Cientifica, Inc. At Prairie View, Inc., Newton, KS); Jerry C. Steiert, M.D. (Summit Research Network (Seattle), LLC, Seattle, WA); Leslie vH. Taylor, M.D. (Dean Foundation of Health, Research and Education, Middleton, WI); Kathleen Toups, M.D. (Bay Area Research Institute, Lafayette, CA). The authors wish to thank Timothy E. Wilens, M.D., for assistance with study design, rater training, and critical review of the study data and manuscript. The authors also wish to thank the following, all of Abbott, for their contributions to this study: Jennifer Barrett, Dawnelle L. McNeill, and Peter J. Schmitz, M.S. Regula E. Egli, Ph.D., of Abbott, provided technical assistance, copyediting and writing support in the preparation of this manuscript. All experiments reported in this manuscript complied with the current laws of the country in which they were performed.
Disclosures
Drs. Apostol, Abi-Saab, and Saltarelli were employees of Abbott at the time of this study. Dr. Abi-Saab is currently a full-time employee of Novartis Pharma AG, Basel, Switzerland, owns equity in both Abbott and Novartis, and is an inventor on patents from Abbott. Dr. Apostol is currently a full-time employee of and owns equity in Novartis Pharma AG, Basel, Switzerland. Dr. Saltarelli is currently a full-time employee of Shire Pharmaceuticals, Wayne, PA, owns equity in Abbott and Shire, and is an inventor on Abbott and Pfizer patents.
Dr. Kratochvil is supported by National Institute of Mental Health (NIMH) Grant 5K23MH06612701A1; receives grant support from Eli Lilly, Abbott, and Somerset; is a consultant for Eli Lilly, AstraZeneca, Abbott and Pfizer; is Editor of the Brown University Child & Adolescent Psychopharmacology Update and member of the REACH Institute Primary Pediatric Psychopharmacology Steering Committee; receives study drug for an NIMH-funded study from Eli Lilly and Abbott.
Dr. Adler has received grant/research support from Shire, Eli Lilly, National Institute of Drug Abuse, and Chelsea Therapeutics; has served on Advisory Boards and as a consultant for AstraZeneca, Eli Lilly, Major League Baseball, Otsuka, and Shire; as a consultant for i3 Research, INC Research, Epi-Q, and United Biosource Corporation. Dr. Adler has received royalty payments (as inventor) from New York University for license of adult ADHD scales and training materials since 2004.
Dr. Feifel has received speaking/consulting fees and/or research grants from Abbott, Alexza, Addrenex, Astra Zeneca, Bristol Myers Squibb, Danipon-Sumitomo, Eli Lilly, Forest, Janssen, Sanofi, Shire, and Wyeth.
Drs. Robieson, Gault, Pritchett, and Collins are employees of Abbott, and hold equity in and receive salary, stock, stock options and other compensation from Abbott.
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Apostol, G., Abi-Saab, W., Kratochvil, C.J. et al. Efficacy and safety of the novel α4β2 neuronal nicotinic receptor partial agonist ABT-089 in adults with attention-deficit/hyperactivity disorder: a randomized, double-blind, placebo-controlled crossover study. Psychopharmacology 219, 715–725 (2012). https://doi.org/10.1007/s00213-011-2393-2
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DOI: https://doi.org/10.1007/s00213-011-2393-2