Riluzole to Treat Parkinson's Disease

This study has been completed.
Sponsor:
Information provided by:
National Institutes of Health Clinical Center (CC)
ClinicalTrials.gov Identifier:
NCT00013624
First received: March 24, 2001
Last updated: March 3, 2008
Last verified: March 2005

March 24, 2001
March 3, 2008
March 2001
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Complete list of historical versions of study NCT00013624 on ClinicalTrials.gov Archive Site
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Riluzole to Treat Parkinson's Disease
Effect of Antiglutamatergic Treatment in Parkinson's Disease

This study will evaluate the effects of the drug riluzole on Parkinson's disease symptoms and on dyskinesias (involuntary movements) that develop as a result of long-term treatment with levodopa. Riluzole blocks the action of the chemical messenger glutamate, thought to be involved in producing Parkinson's symptoms. The drug is currently approved to treat amyotrophic lateral sclerosis, another neurologic condition.

Patients with relatively advanced Parkinson's disease between 20 and 80 years of age may be eligible for this 4-week study. Participants will have a complete medical history and physical examination, and a detailed neurological evaluation. The evaluations will include blood tests and an electrocardiogram, and possibly brain magnetic resonance imaging (MRI), CT scan, and chest X-ray.

Participants will, if possible, stop taking all antiparkinsonian medications except levodopa (Sinemet) for one month before the study begins and throughout its duration. For the first 1 to 3 days, patients will be admitted to the NIH Clinical Center to undergo a levodopa "dose-finding" procedure. For this study, patients will stop taking their oral Sinemet and instead will have levodopa infused through a vein for up to 8 hours/day. During the infusions, the levodopa dose will be increased slowly until either 1) parkinsonian symptoms improve, 2) unacceptable side effects occur, or 3) the maximum study dose is reached. Symptoms will be monitored frequently to find two infusion rates: 1) one that is less than what is needed to relieve symptoms (suboptimal rate), and 2) one that relieves symptoms but may produce dyskinesias (optimal rate).

When the dose-finding phase is completed, treatment will begin. Patients will take riluzole or placebo (a look-a-like pill with no active ingredient) twice a day, along with their regular Sinemet, for 3 weeks. (All participants will receive placebo at some time during the study, and some patients will receive only placebo throughout the entire 4 weeks.) At the end of each week, patients will be readmitted to the hospital and receive the previous week's dose of riluzole or placebo in combination with a levodopa infusion at the rate determined in the dose-finding phase of the study. The procedure for the infusion will be the same as that for the dose-finding phase. The dose of riluzole will be increased until the optimum dose has been achieved or until side effects occur (at which time the dose will be lowered or the drug stopped).

Throughout the study, parkinsonian symptoms and dyskinesias will be evaluated using standardized rating scales and blood samples will be drawn periodically to measure drug levels.

The objective of this study is to evaluate the acute effects of a nonselective inhibitor of glutamate mediated synaptic transmission on the severity of parkinsonian signs and levodopa-associated motor response complications in patients with moderately advanced Parkinson's disease. In a controlled proof-of-principle clinical trial, the efficacy of the glutamate release inhibitor riluzole will be assessed through the use of validated motor function scales. Safety will be monitored by means of frequent clinical evaluations and laboratory tests.

Interventional
Phase 2
Endpoint Classification: Safety/Efficacy Study
Primary Purpose: Treatment
Parkinson's Disease
Drug: IV Levodopa
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*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
 
Completed
20
March 2005
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INCLUSION CRITERIA:

Males and females between the ages of 20-80 are eligible for study. Women must be either at least one year post-menopausal, or using an adequate contraceptive method for at least one month prior to and during participation in this study. All will carry the diagnosis of idiopathic Parkinson's disease based on the presence of a characteristic clinical history and neurological findings. All will have relatively advanced disease with levodopa-associated motor response complications, including peak-dose dyskinesias and wearing-off fluctuations.

EXCLUSION CRITERIA:

The presence or history of any medical condition that can reasonably be expected to subject the patient to unwarranted risk. Any clinically significant laboratory abnormalities including liver enzyme elevations more than two times the upper limit of normal, or neutropenia (wbc less than 3000).

Parkinson's disease patients exhibiting diphasic or end-of dose dyskinesias or disabling dystonia will be excluded. Patients who are unable to be treated with levodopa/carbidopa alone or with a single, relatively short-acting dopamine agonist will also be excluded.

Patients with a form of parkinsonism other than idiopathic PD or with a diagnosis of dementia (MMSE less than 24) or major psychiatric disorder (UPDRS [Part I Item 3] greater than or equal to 2).

Patients with unacceptable prior/concomitant medications will also be excluded.

Since the influence of any investigational compound on the unborn child and reproductive organs is unknown, pregnant women and those not practicing effective means of birth control will be excluded as well.

Patients with prior bilateral surgical intervention for the treatment of parkinsonian symptoms, i.e. deep brain stimulation, pallidotomy, fetal tissue transplantation as well as patients must at risk for hypotension, cardiac arrhythmia, and/or myocardial ischemia secondary to intravenous levodopa challenge will be excluded.

Both
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No
Contact information is only displayed when the study is recruiting subjects
United States
 
NCT00013624
010118, 01-N-0118
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National Institute of Neurological Disorders and Stroke (NINDS)
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National Institutes of Health Clinical Center (CC)
March 2005

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP