John H. Krystal, M.D., Joyce A. Cramer, B.S., William F. Krol, Ph.D., Gail F. Kirk, M.S., Robert A. Rosenheck, M.D., for the Veterans Affairs Naltrexone Cooperative Study 425 Group
Background Although naltrexone, an opiate-receptor antagonist,has been approved by the Food and Drug Administration for thetreatment of alcohol dependence, its efficacy is uncertain.
Methods We conducted a multicenter, double-blind, placebo-controlledevaluation of naltrexone as an adjunct to standardized psychosocialtreatment. We randomly assigned 627 veterans (almost all men)with chronic, severe alcohol dependence to 12 months of naltrexone(50 mg once daily), 3 months of naltrexone followed by 9 monthsof placebo, or 12 months of placebo. All patients were offeredindividual counseling and programs to improve their compliancewith study medication and were encouraged to attend AlcoholicsAnonymous meetings.
Results There were 209 patients in each group; all had beensober for at least five days before randomization. At 13 weeks,we found no significant difference in the number of days torelapse between patients in the two naltrexone groups (mean,72.3 days) and the placebo group (mean, 62.4 days; 95 percentconfidence interval for the difference between groups, 3.0to 22.8). At 52 weeks, there were no significant differencesamong the three groups in the percentage of days on which drinkingoccurred and the number of drinks per drinking day.
Conclusions Our findings do not support the use of naltrexonefor the treatment of men with chronic, severe alcohol dependence.
Source Information
From the Department of Veterans Affairs Alcohol Research Center, Veterans Affairs Connecticut Healthcare System, West Haven, Conn. (J.H.K., J.A.C., R.A.R.); the Department of Psychiatry, Yale University School of Medicine, New Haven, Conn. (J.H.K., J.A.C., R.A.R.); the Department of Veterans Affairs Cooperative Studies Program Coordinating Center, Perry Point, Md. (W.F.K., G.F.K.); and the Northeast Program Evaluation Center, Department of Veterans Affairs Connecticut Healthcare System, West Haven, Conn. (R.A.R.).
Address reprint requests to Dr. Krystal at the Alcohol Research Center (G7E), the Department of Veterans Affairs Connecticut Healthcare System, 950 Campbell Ave., West Haven, CT 06516-2770, or at john.krystal{at}yale.edu.
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