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“PRN” Medication for Alcohol Dependence May Reduce Harm

  • Kenneth J. Bender, PharmD, MA
Jun 18, 2013
Volume: 
30
Issue: 
6
  • Alcohol Abuse, Addiction

In the largest controlled study to date of an “as-needed” medication treatment modality, prn use of an opioid antagonist for heightened alcohol craving appeared to reduce the number of heavy drinking days and total amount of alcohol consumed.

Karl Mann, MD, PhD, and associates at the University of Heidelberg reported their findings in the April 2013 issue of Biological Psychiatry. They commented that the treatment paradigm could address an unmet medical need, “because it . . . has the potential to engage patients at risk of alcohol-related harm who might otherwise not have sought help.”1

In an accompanying commentary, Robert Swift, MD, PhD, of Brown University, observed that the goal of reduction rather than abstinence remains controversial.2 Many—including Alcoholics Anonymous—consider abstinence to be the only viable treatment outcome. Still others seek harm reduction from reduced alcohol consumption as a more realistic goal.2

There is benefit, however, in whichever goal can be attained, Swift points out. “Evidence suggests that both abstinence and low-risk alcohol drinking outcomes during treatment predict decreased drinking and reduced alcohol problems more than a year after treatment ends.”

Novel compound taken as needed

The study by Mann and colleagues is at once the largest controlled trial of an “as-needed” medication regimen for alcohol dependence and the largest double-blind placebo-controlled assessment of nalmefene—a compound similar to naltrexone (ReVia). Nalmefene is not yet available in the US. These opioid antagonists are thought to interfere with the reinforcing effects of alcohol mediated by opioid receptor systems. Naltrexone is an antagonist at the μ-, κ-, and δ-opioid receptors. Nalmefene is an antagonist at the μ receptor and a partial agonist at the κ site.

Swift notes that the κ-opioid receptor has been associated with the dysphoria and anxiety in chronic alcohol dependence and withdrawal. He acknowledges, however, that “it is not known whether this difference in κ-opioid receptor activity between the two drugs is reflected in differences in their efficacy in reducing drinking or in differences in side effects.” Naltrexone—but not nalmefene—has the potential to be hepatotoxic.

The study was conducted with more than 600 patients at 39 sites in Austria, Finland, Germany, and Sweden. Patients were randomized to receive 6 months of treatment with placebo or nalmefene, 18 mg/d. “They perceived a risk of drinking alcohol . . . preferably 1 to 2 hours before anticipated time of drinking.”1

In addition to the medication or placebo, all patients participated in a psychosocial therapeutic regimen (acronym, BRENDA3).

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References: 

1. Mann K, Bladström A, Torup L, et al. Extending the treatment options in alcohol dependence: a randomized controlled study of as-needed nalmefene. Biol Psychiatry. 2013;73:706-713.

2. Swift RM. Naltrexone and nalmefene: any meaningful difference? Biol Psychiatry. 2013;73:700-701.

3. Starosta AN, Leeman RF, Volpicelli JR. The BRENDA model: integrating psychosocial treatment and pharmacotherapy for the treatment of alcohol use disorders. J Psychiatr Pract. 2006;12:80-89.

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