Click on buttons below for interactive world maps on

Then click on country/state to view individual trials.

NOTE:  In December 2017, released a new version of its website featuring enhanced search and usability features, including the ability to search for trials by city/distance from city.  To learn more about these features, visit Further Enhancements to Functionality. NLM Tech Bull. 2017 Nov-Dec and More Changes to Improve Usability. NLM Tech Bull. 2017 Sep-Oct.

An OBSERVATIONAL STUDY is a type of clinical study in which participants are identified as belonging to study groups and are assessed for biomedical or health outcomes. Participants may receive diagnostic, therapeutic, or other types of interventions, but the investigator does not assign participants to  specific interventions/treatments.

​Assessment may be based on data collected from participants at a point in time or over a period of time.

Snapshot of

# PD Studies Recruiting 

as of Jan. 22, 2019


INT Phase 14026
INT Phase 26130
INT Phase 3179
INT Phase 4146
INT No Phase17072

Studies with no phase specified may include evaluations of interventions such as exercise, physical therapy, speech therapy, dietary supplements and more.

How to find recruiting PD clinical trials near you

1) Go to (see screenshot below)

2) Enter search parameters to find studies you may be interested in. 

3) View list of studies matching your criteria.

​4) Click on a study's title for more info about that study, including study description, study design, study sponsor, eligiblity criteria, and contact info.

Other terms box - Helpful search terms include: Interventional, Phase 1, Phase 2, Phase 3, Phase 4, Observational. Can use combination of terms.

Phase 1 evaluates therapy safety with small # participants ( <100).

Analyzing the Parkinson's disease clinical trial pipeline to facilitate patient collaboration in research.

Phase 2 evaluates therapy safety and efficacy with up to several hundred participants.

Click on 'Search" button to view list of trials matching your criteria (or "Advanced Search" option for more search criteria). 

Access Recruiting PD Trials in your Area


View Recruiting PD Trials via Interactive Maps

recruiting PARKINSON'S DISEASE trials

Phase 3 evaluates therapy safety and efficacy with 100's or thousands of participants.

An INTERVENTIONAL STUDY (or Clinical Trial) is a clinical study in which participants are assigned an intervention such as a medication, device, or procedure, so that researchers can evaluate its effects on biomedical or health-related outcomes.  Participants may receive diagnostic, therapeutic, or other types of interventions.  Randomized, placebo-controlled clinical trials are the gold standard for assessing the safety and effectiveness of a therapy.

Select Country (or leave blank to see all countries). After selecting Country, options for State (U.S. only), City, and Distance will appear. 

This page provides access to information about currently recruiting interventional and observational Parkinson's disease studies taking place around the world.  It is intended to help patients and controls find trials of interest to them that they may qualify to participate in.  Unless otherwise noted, recruiting trial information is provided through (See overview.) Further information about any trial you may be interested in can be obtained by contacting the trial coordinator listed in the trial description.

Phase 4 involves further study of therapies already FDA-approved.

INT = Interventional, OBS = Observational

Total # Recruiting = 415 (285 INT* + 130 OBS)

*17 trials are combined Phase 1/2 or Phase 2/3