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Nalmefene reduces heavy alcohol drinking

Posted Jul 07 2007 2:32pm

Newswise – Problem drinkers who took the craving-curbing drug nalmefene whenever they felt the desire to drink alcohol reported fewer heavy drinking days each month than drinkers who took a placebo pill, but both groups reported marked reductions in heavy drinking days. Nalmefene is not yet available in the United States; it is still considered investigational.

Those findings come from a study of 403 heavy drinkers in Finland, who took either a placebo or the drug nalmefene on an “as needed basis.”

“It has a robust and sustained effect in reducing harmful heavy drinking in a large study population,” said researcher Sakari Karhuvaara. “Alcohol problems have huge negative impacts on the well-being of individuals and families and cause enormous costs to society due to lost working days, accidents, treatment of alcohol-related disease, etcetera.”

The results of this randomized, double-blind, placebo-controlled study of nalmefene appear in the July 2007 issue of Alcoholism: Clinical & Experimental Research. The drug maker supported the new study.

Before the study, patients assigned to nalmefene treatment reported 15.5 average heavy drinking days each month. They were directed to take the drug whenever they felt a looming urge to drink. During the first three months of treatment, the average number of heavy drinking days was 8.6 to 9.3 for the people in the nalmefene group.

The drinkers assigned to the placebo group had somewhat less dramatic reductions. They averaged 16.2 heavy drinking days a month before the study and 10.6 to 12.0 during the trial.

Researchers double-checked participant-reported alcohol consumption changes with tests that measured alcohol-use biomarkers in the blood.

In the United States, abstinence has been the traditional goal of the treatment of alcohol dependence, but in the last 20 years, there has been a movement to consider harm reduction or drinking reduction as an alternative goal to abstinence for some. Traditional addiction specialists often consider the idea of reduced drinking to be a seductively dangerous idea that dovetails all-too-conveniently with the alcoholic’s renowned levels of denial.

“Alcohol dependence is nowadays recognized as a chronic, recurring disorder where relapses almost inevitably occur during and after the treatment,” Karhuvaara said. So focusing on harm reduction in the short term is often much more feasible than complete abstinence, he added.

Karhuvaara is a physician and health researcher who was once an employee of Biotie Therapies Corp., the manufacturer of nalmefene.

“There are fair amounts of good data (showing) that the more drinks you have a day, the more likely you are to have health or social consequences,” said alcohol researcher Raymond Anton. “The thinking is that if you can reduce heavy drinking days or the number of drinks per drinking day, you might actually alleviate some suffering, even though you don’t cause the person to be abstinent.”

Not everyone who seeks alcohol treatment is ready to consider a lifetime without alcohol, so an abstinence goal can be seen as a barrier for some people considering help. Many health professionals believe that a harm reduction approach can draw more people into treatment, said Anton, director of the Center for Drug and Alcohol Programs at the Medical University of South Carolina. Anton did not participate in the Finnish study, but he has conducted nalmefene research in the United States.

The Finnish researchers note some side effects among people in the nalmefene group, including nausea, abdominal discomfort, as well as energy and sleep difficulties. However, most study participants remained in the trial and continued using nalmefene.

I wish they’d done an analysis to see if the people who suffered those side effects were the same people who drank less. Perhaps some of the reduction in drinking may have been because they didn’t feel so good, rather than because the drug just took away an urge to drink,” Anton said.

Patients must take most medications for alcohol treatment daily. Nalmefene – taken “as needed” – fits into the harm reduction treatment approach.

Karhuvaara said his study also suggests that “practically any doctor” could successfully administer nalmefene for problem alcohol drinking in a wide variety of medical settings.

“It is an attempt to get the drug out of the sole use of addiction specialists and into the hands of primary providers,” Anton said.

Nalmefene is an opioid antagonist that works to block the effects of endorphins. The U.S. Food and Drug Administration has not approved nalmefene for use in alcohol treatment; nalmefene is primarily available in investigational studies.


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