Anti-addiction drugs linked to depression

updated 6:04 p.m. EDT, Wed April 23, 2008


Anti-addiction drugs linked to depression
Story Highlights
"Super pills" intended to curb addiction by blocking brain's pleasure centers

Research indicates drugs may block too much pleasure, risking depression, suicide

Expert: "The door is closing" on this approach to curbing addiction


CHICAGO, Illinois (AP) -- Two years ago, scientists had high hopes for new pills that would help people quit smoking, lose weight and maybe kick other tough addictions such as alcohol and cocaine.


The so-called "super pills" worked in a novel way, by blocking pleasure centers in the brain that provide the feel-good response from smoking or eating. Now it seems the drugs may block pleasure too well, possibly raising the risk of depression and suicide.

Margaret Bastian of suburban Rochester, New York, was among patients who reported problems with Chantix, a highly touted quit-smoking pill from Pfizer Inc. that has been linked to dozens of reports of suicides and hundreds of suicidal behaviors.

"I started to get severely depressed and just going down into that hole ... the one you can't crawl out of," said Bastian, whose doctor took her off Chantix after she swallowed too many sleeping pills and other medicines one night.

Side effects also plague two other drugs:

• Rimonabant, an obesity pill sold as Acomplia in Europe, was tied to higher rates of depression and a suicide in a study last month. The maker, Sanofi-Aventis SA, still hopes to win its approval in the United States.

• Taranabant, a similar pill in late-stage testing, led to higher rates of depression and other side effects in a study last month. Its maker, Merck & Co., stopped testing it at middle and high doses.

The makers of the new drugs insist they are safe, although perhaps not for everyone, such as people with a history of depression. Having to restrict the drugs' use would be a big setback because it would deprive the very people who need help the most, since addictions and depression often go hand-in-hand, doctors say.

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