"This study focused on those patients," said Smith, an assistant professor of nursing at the University of Michigan School of Nursing, in Ann Arbor.
"The findings show that there is a medication that may be effective for reducing their pain from neuropathy," Smith said. But, she added, it didn't help everyone; the majority of Cymbalta patients improved, while others saw no change -- and 10 percent got worse.
The study included 231 patients with nerve pain that had persisted for at least three months since their chemo regimen ended. Half were randomly assigned to take Cymbalta for five weeks, while the other half took placebo pills. The two groups then switched treatments. None of the patients knew when they were taking the real drug and when they were on the placebo.
Of the patients given Cymbalta first, the average pain score fell by a point on a scale of 0 to 10. That's considered to be a "clinically important" change, Smith said, meaning it's an improvement patients notice in their daily lives.
The Cymbalta patients were also twice as likely to have a 50 percent decrease in pain scores versus the placebo users, and overall they reported improvements in their daily functioning and quality of life.
It is not clear how the antidepressant helps with nerve-related pain, but it is thought to act on certain brain chemicals involved in transmitting pain signals.
The findings are encouraging, Stubblefield said. But, like Smith, he pointed out that not everyone responds to Cymbalta. "This doesn't mean I'll be putting all my patients on it," he said.
There are other treatments for chemo-related pain -- although they have not yet been shown to work in rigorous clinical trials. One option, Stubblefield said, is Lyrica (pregabalin), which is another drug approved to treat other forms of nerve-damage-related pain.
Stubblefield said Lyrica tends to have fewer side effects than Cymbalta, and at least some patients may be abl
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