FDA OKs Drug for Parkinson's Dementia
Drug, Called Exelon, Is Already in Use for Alzheimer's Dementia
June 28, 2006 -- The FDA approved today the drug Exelon to treat mild to
moderate dementia associated with Parkinson's
Parkinson's disease is a chronic, progressive neurological disease. It
results from the gradual destruction of nerve cells in the part of the brain
that controls body movements. Symptoms include shaking (tremor), weakness, and
Exelon isn't a new drug. The FDA had previously approved it to treat mild to
moderate Alzheimer's dementia, the most common type of dementia in older
Parkinson's disease becomes more common with advanced age; so does dementia.
But those conditions aren't part of the normal aging process.
The FDA estimates that less than 1% of people over age 65 are affected by
Parkinson's dementia (0.2% to 0.5%). Parkinson's dementia symptoms include
problems with memory, attention, planning, impulse control, and reasoning
Steven Galson, MD, MPH, director of the FDA's Center for Drug Evaluation and
Research, commented on Exelon's new approval in an FDA news release.
"It's been recognized for almost a decade that the dementia of patients
with Parkinson's disease differs from the dementia of patients with
Alzheimer's, but until now, there has been no treatment that has been shown to
be effective specifically for the dementia associated with Parkinson's
disease," Galson states. "Today's approval of Exelon helps to fill this
However, Exelon isn't a cure for dementia. The drug is designed to slow the
progression of dementia, not to reverse dementia.
The FDA approved Exelon as a Parkinson's dementia treatment based on the
results of a clinical study.
The study included 541 patients who showed symptoms of mild to moderate
dementia at least two years after being diagnosed with Parkinson's disease. The
patients were randomly assigned to take either Exelon or a placebo (sham
treatment) for six months. They didn't know whether they were taking Exelon or
At the end of the six-month trial, the condition of the Exelon-treated
patients, as shown on a scale that measures mental processes, was significantly
better than the condition of the patients on placebo, according to the FDA.
Drug's Side Effects
Exelon has been associated with "significant gastrointestinal adverse
reactions," states the FDA.
In clinical trials, 47% of the patients treated with Exelon developed
nausea, and 26% of women and 18% of men on high doses of Exelon experienced
Other common adverse events reported by patients on Exelon include vomiting,
appetite loss, indigestion, and strength
loss. In some patients with Parkinson's disease, Exelon treatment was
associated with a worsening of tremor, according to the FDA.
Exelon is made by Novartis Pharmaceutical Corp. Novartis is a WebMD