Ignite Creation Date:
2025-12-24 @ 10:16 PM
Ignite Modification Date:
2026-01-24 @ 7:08 AM
Study NCT ID:
NCT01190735
Status:
COMPLETED
Last Update Posted:
2015-04-16
First Post:
2010-08-26
Is Gene Therapy:
True
Has Adverse Events:
False
Brief Title:
Caffeine for Motor Manifestations of Parkinson's Disease
Sponsor:
Ron Postuma
Organization:
Study Overview
Official Title:
Caffeine for Motor Manifestations of Parkinson's Disease: An Open-Label Dose-Response Study.
Status:
COMPLETED
Status Verified Date:
2015-04
Last Known Status:
None
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
False
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
None
Brief Summary:
Numerous epidemiological studies have linked lifelong use of caffeine to a lower risk of Parkinson's disease (PD) - prospective studies have estimated that non-coffee drinkers have an approximately 1.7-2.5 fold increased risk of developing PD compared to coffee drinkers. This is an extremely important finding which deserves further more in depth investigations.
The exact pathophysiological mechanism remains elusive, but multiple hypotheses do exist: Caffeine antagonizes adenosine receptors directly yielding an improvement on motor systems and even on Levodopa serum concentrations (when on therapy). An additional explanation is that adenosine antagonism has neuroprotective properties by acting locally on basal ganglia circuits and the substantia nigra.
The current study aims to identify the optimal caffeine dose with maximal motor benefit and the least amount of undesirable adverse effects.
The exact pathophysiological mechanism remains elusive, but multiple hypotheses do exist: Caffeine antagonizes adenosine receptors directly yielding an improvement on motor systems and even on Levodopa serum concentrations (when on therapy). An additional explanation is that adenosine antagonism has neuroprotective properties by acting locally on basal ganglia circuits and the substantia nigra.
The current study aims to identify the optimal caffeine dose with maximal motor benefit and the least amount of undesirable adverse effects.
Detailed Description:
Caffeine has been in widespread use for centuries, and is the commonest psychostimulant used worldwide. In Canada, estimates of mean daily intake for a 70 kg person range from 200-450 mg. The main sources of caffeine ingestion are in beverages - depending on brewing technique a typical cup of drip-filtered coffee can contain between 100 and 150 mg of caffeine (gourmet drip coffees contain up to 300 mg and espresso preparations generally contain much less caffeine). Black tea contains between 30 and 50 mg, and lower amounts of caffeine are found in soft drinks, green teas, and chocolate. Caffeine is a substance with a well-defined effect and side-effect profile, and in general it is very well tolerated. Side effects can include irritability, insomnia, enhancement of physiologic tremor, and stomach upset. Abrupt withdrawal from caffeine can cause headache and excessive sleepiness. Caffeine can exacerbate pre-existing supraventricular tachycardia. Multiple large-scale epidemiologic studies have not found evidence for adverse health effects with long-term moderate use of caffeine. Caffeine has a T-max of approximately 1 hour and readily crosses the blood brain barrier. It has first order kinetics. Plasma half life estimates range from 3-6 hours, increased in the case of pregnancy or severe liver disease. Drug interactions are uncommon: Caffeine withdrawal may cause lithium toxicity, and caffeine increases clozapine levels.
CNS effects of caffeine are mainly due to antagonism of the A1 and A2A adenosine receptors, (A2A predominates in the striatum). Potential effects upon motor manifestations of PD are predominantly related to the antagonistic action of adenosine on dopamine release in the striatum. Partial tolerance to CNS effects is common, and begins to occur within one week (tolerance is more pronounced for the A1 receptor, suggesting that motor changes may show less tolerance). If effective for PD, caffeine has the potential to be a very important advance for patient care, for numerous reasons. First of all, it has been in widespread use for centuries, so the long-term safety has been determined. Caffeine is widely available as tablets which are very inexpensive (i.e. less than 25 cents per tablet), potentially resulting in substantial cost savings for patients and health-care planners. Caffeine also has the potential (as yet unproven) to treat non-motor manifestations of PD, particularly excessive daytime somnolence.
CNS effects of caffeine are mainly due to antagonism of the A1 and A2A adenosine receptors, (A2A predominates in the striatum). Potential effects upon motor manifestations of PD are predominantly related to the antagonistic action of adenosine on dopamine release in the striatum. Partial tolerance to CNS effects is common, and begins to occur within one week (tolerance is more pronounced for the A1 receptor, suggesting that motor changes may show less tolerance). If effective for PD, caffeine has the potential to be a very important advance for patient care, for numerous reasons. First of all, it has been in widespread use for centuries, so the long-term safety has been determined. Caffeine is widely available as tablets which are very inexpensive (i.e. less than 25 cents per tablet), potentially resulting in substantial cost savings for patients and health-care planners. Caffeine also has the potential (as yet unproven) to treat non-motor manifestations of PD, particularly excessive daytime somnolence.
Study Oversight
Has Oversight DMC:
False
Is a FDA Regulated Drug?:
None
Is a FDA Regulated Device?:
None
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
None
Is an FDA AA801 Violation?: