The noradrenergic system plays an important role in the pathophysiology of alcohol use disorder (AUD). Medications in this class may reduce drinking. Our aims were to investigate this in a unique sample of individuals with AUD.
Thirty-six individuals with AUD were randomized to treatment with prazosin, an alpha-1 noradrenergic antagonist, or placebo, for 6 weeks (target daily dose 16 mg). Hierarchical linear modeling was used to examine the effect of treatment group on rate of change in primary (drinks per week [DPW]) and several secondary outcome measures.
Prazosin did not significantly affect rate of reduction in alcohol use in the intent to treat sample (n = 36) compared with placebo, but did significantly increase the rate of reduction in DPW in an optimal treatment exposure subgroup (beta = −0.3; P = 0.01; event rate ratio 0.74; confidence interval 0.59, 0.93; n = 27). Poor adherence and tolerability may have contributed to null effects. Diastolic blood pressure (DBP) moderated the effects of treatment group on rate of reduction in drinks per drinking day, supporting previous work in doxazosin, another alpha-1 antagonist. Specifically, prazosin was associated with greater rates of reduction in drinking compared with placebo in individuals with high but not low DBP.
Our findings do not support the clinical utility of prazosin for all treatment-seeking AUD, but post hoc analyses indicate that it might have some efficacy in individuals who can tolerate it. Further work exploring the clinical utility of DBP as a treatment matching variable, and defining optimal values using sensitivity and specificity analyses, is warranted.
Mind Research Network, Albuquerque, NM (CEW); Department of Psychology, Center on Alcoholism, Substance Abuse & Addictions, University of New Mexico, Albuquerque, NM (JST); Department of Psychiatry, New York University School of Medicine, New York, NY (MPB); Department of Psychiatry, University of New Mexico, Albuquerque, NM (JC, RB); Center of Excellence in Substance Abuse Treatment and Education, VA Puget Sound Health Care System, Seattle, WA; Mental Illness Research Education and Clinical Center, VA Puget Sound Health Care System, Seattle, WA; Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, WA (TS).
Send correspondence to Claire E. Wilcox, MD, Mind Research Network, 1101 Yale Blvd., NE, Albuquerque, NM 87106. E-mail: firstname.lastname@example.org
Received 15 January, 2018
Accepted 6 March, 2018
Funding: This work was supported by the National Institutes of Health grant number K23-AA021156 awarded to Claire Wilcox.
The authors have no financial conflicts of interest to report.
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