Their study is the first to evaluate the drug, ibudilast, as a treatment for alcoholism. Study participants were given either the drug (20 milligrams for two days and 50 milligrams for the next four) or a placebo for six consecutive days. After about a two-week break, those who took the drug were switched to a placebo for six days, and those who were taking the placebo were given ibudilast. The researchers found that the subjects’ craving for alcohol was significantly lower when they were taking the medication.
In addition, the participants’ reactions were measured after they were asked to hold and smell a glass of their preferred alcoholic beverage but not allowed to drink it. The subjects reported being in a better mood while they were taking ibudilast than when they were on the placebo.
The research evaluated 17 men and seven women who, prior to the study, reported drinking alcohol an average of 21 days per month and drinking seven alcoholic beverages per day when they drank. On the sixth day of each phase of the study, participants received an intravenous dose of alcohol — the equivalent of about four drinks —to test how the medicine interacts with alcohol and whether it can be safely administered when people are drinking. (Participants stayed overnight at the UCLA Clinical and Translational Research Center, where the study was conducted.)
“We found that ibudilast is safe and well-tolerated,” said Lara Ray, a UCLA professor of psychology, director of the UCLA Addictions Laboratory and the study’s lead author. “This medication can be safely administered, including when people are drinking alcohol.”
Side effects from the drug, which included nausea and some abdominal pain, were mild, and none of the participants dropped out of the study. The research is published online by Neuropsychopharmacology, and will appear later in in the journal’s print edition.
Researchers also evaluated the drug’s efficacy by looking at how well and how quickly participants could recover from a stressful situation. When the study began, the researchers asked participants to describe sources of stress in their lives. On the fifth day of each phase the study — when the participants were taking ibudilast and again when they were taking the placebo — researchers discussed those situations with the participants. The subjects’ moods improved much more quickly after hearing about their own stressful situations when they were taking ibudilast than when they received the placebo.
The treatment seemed to especially help those in the study who had depressive symptoms, which are common in heavy drinkers of alcohol. The drug appears to reduce the pleasurable effects of alcohol.
Chronic alcohol consumption elevates brain inflammation in animals, and earlier research showed that ibudilast was effective in reducing rats’ alcohol consumption. But it wasn’t a foregone conclusion that it would also be effective in humans, Ray said.
For one thing, other drugs that have shown promise in rats caused too many negative side effects in humans. That’s a common problem when medications tested on animals are then evaluated for human use; Ray said that many medications that are effective in animal studies ultimately fail to help people — a phenomenon she called the “valley of death” of pharmaceutical development.
“We’re excited to see that the strong animal data with ibudilast is now followed by our finding that ibudilast is well-tolerated in humans,” she said.
Ray, whose laboratory studies the causes of and possible treatments for drug and alcohol addiction, said testing new treatments for alcoholism is critical because the U.S. Food and Drug Administration has approved only four treatments for alcoholism, and they have been only modestly effective.
Although the new study is promising, further clinical trials are needed, said Ray, who is also a member of the UCLA Brain Research Institute. Ibudilast is not currently available as a treatment for alcoholism.
Ray plans to test the drug on heavy drinkers who expressly want to quit drinking. (Those in the current study were not trying to quit.) She also plans to study how ibudilast reduces brain inflammation.
Ray’s laboratory is recruiting people who want to quit smoking cigarettes and reduce their alcohol consumption. Participants will receive free medication and counseling. Candidates may call 310-206-6756 for information.
The study’s co-authors, all from UCLA, are Steven Shoptaw, professor of family medicine and of psychiatry and biobehavioral sciences; Keith Heinzerling, an associate professor of family medicine at the David Geffen School of Medicine; doctoral student Spencer Bujarski; project scientist Daniel Roche; and Karen Miotto, a clinical professor of psychiatry at the Semel Institute for Neuroscience and Human Behavior.
The medication was provided by MediciNova, which manufactures ibudilast.