June 23, 2008

Cymbalta For Knee Pain?

I've been noting for some time now the rise in studies of anti-depressants for treatment of pain, the increased use by pain management docs of anti-depressants for pain treatment and the recent approval of Cymbalta for fibromyalgia. I'm fairly dubious of anti-depressants for pain--the studies seem to overstate treatment efficacy and what I hear from the patient world doesn't detract from my doubts--but then I am fairly dubious of how effective anti-depressants are for depression. Studies like this new one, led by a Lilly researcher, sure don't make my doubts seem too misplaced.

The study was of how Cymbalta worked in treating knee pain, or osteoarthritis, and had some interesting results:

"Duloxetine [Cymbalta] showed statistically significant improvement in pain associated with osteoarthritis of the knee according to the primary efficacy measure of mean 24-hour average pain scores. Fifty-nine percent of duloxetine-treated patients experienced a 30 percent improvement in pain compared with 45 percent of patients taking placebo. Forty-seven percent of duloxetine-treated patients experienced a 50 percent improvement in pain compared with 29 percent of placebo-treated patients."

That's an effect size of 14 percent, which is truly unimpressive, but I bet the FDA would approve the anti-depressant for knee pain. And there's no way Lilly would've shelled out money on a clinical trial if it weren't going to pursue an indication for knee pain. Unless this data is part of the company's recent application to have Cymbalta approved for chronic pain. Anyone of my readers at Lilly want to clarify this for me?

Soon enough we shall have a knee pain treatment with a black box warning for suicidality. How weird.

Posted by Philip Dawdy at June 23, 2008 12:03 AM
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Comments

Unbelievable... shouldn't they have to... gosh, I don't know... accomplish something in order to clear FDA? Oh it works for 1 in 10 or 2 in 10? Spectacular, let's clear it through and start the beat-them-over-the-head marketing straight to the consumer.

That level of efficacy I could accept in a cancer or AIDS treatment effort. But chronic pain is not fatal, and considering the side effects of anti-depressants, it seems foolish to increase the chance of death. Don't get me wrong, chronic pain will drive one up a wall (I should know, it makes me cranky beyond reason), but we have pain killers and anti inflammatory meds already.

Posted by: Jordan at June 22, 2008 11:59 PM

Here we have it again, 45 percent experience an improvement in pain on the placebo. When will someone study the placebo effect? Also, the phrase "improvement in pain" concerns me. Note how the phrase "decrease in pain" is not used. This is probably not because the studiers are functionally illiterate but instead some cautious language put in by lawyers. Officially, fibromyalgia is considered to have "a psychological component" hence the anti depressants which I think folks who think they have fibromyalgia don't like.

Posted by: Sally at June 23, 2008 03:20 AM

Speechless...

Posted by: Ana at June 23, 2008 05:20 AM

Cymbalta has certainly been marketed along these lines from the beginning -- at least judging from the long-running ads on TV, the ones that emphasize the "physical" pain of depression. It's already used in neuropathy pain for diabetes -- so it is not surprising that Lilly is extending the range of pains for which Cymbalta is the purported killer. (no pun intended....)

Posted by: maria at June 23, 2008 08:49 AM

Did you know that Lilly wanted to get an indication for Zyprexa to treat migraines? Thank god that failed.

The alleged fine line here is people with depression have increased pain complaints, as they are more focused on somatic issues when depressed. So, does an antidepressant really affect pain by itself, or does it decrease depressive features which then decrease the rumination on negative issues, like pain?

Watch the takeoff of Lyrica with its Fibromyalgia indication now. Its poisons will certainly be more apparent by the end of '08.

Posted by: therapyfirst at June 23, 2008 09:01 AM

Thank God I know what Cymbalta is considering I live with 2 knees that flare up from old injuries. Physical therapy worked for both (one very mangled in a car accident)I also would rather do swimming, yoga or meditation, eat Advil --rather than take an SSRI for something like this.Nothing like having the Cymbalta not work, still have pain and then suffer withdrawals. Nice try Lilly. No thanks.(yes, I've had negative experiences on SSRIs)

Posted by: Stephany at June 23, 2008 09:58 AM

A portable TENS unit can be very useful. I have one for my L5/S1 issue that can get through sitting in a car or shopping trips. It's certainly no cure, but I've been able to avoid narcotics thus far.

Posted by: Paul at June 23, 2008 11:56 AM
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