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Could a Parkinson's drug tame OCD?

NCT ID NCT05624528

Symptom relief Sponsor: University of Chicago Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing This study
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study tests whether tolcapone, a drug used for Parkinson's disease, can reduce symptoms of obsessive-compulsive disorder (OCD) in adults. About 49 people with moderate to severe OCD will receive either tolcapone or a placebo. The main goal is to see if the drug safely lowers OCD severity and improves quality of life.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Phase 2

Tests whether the treatment actually works, and watches for side effects, in a larger group.

Participants

49 people

The number who actually took part.

Started

Jun 2023

Expected to finish

Jun 2026

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 65 years

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Men and women age 18-65 years 2. Primary diagnosis of OCD 3. YBOCS score of at least 21 at baseline (moderate or higher severity) 4. Ability to understand and sign the consent form Exclusion Criteria: 1. Unstable medical illness based on history or clinically significant abnormalities on baseline physical examination 2. Current pregnancy or lactation, or inadequate contraception in women of childbearing potential 3. Subjects considered an immediate suicide risk based on the Columbia Suicide Severity rating Scale (C-SSRS) (www.cssrs.columbia.edu/docs) 4. History of psychosis or bipolar disorder based on DSM-5 criteria 5. Alcohol/substance use disorder and/or illegal substance use based on urine toxicology 6. Initiation of psychological interventions within 3 months of screening (those who are continuing with CBT will be included) 7. Use of any new psychotropic medication within 3 months of study entry (stable doses of psychotropics will be allowed) 8. Major cognitive impairment that interferes with the capacity to understand and self-administer medication or provide written informed consent 9. Abnormal liver function tests at baseline 10. MADRS \>30 at baseline

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Conditions

The condition(s) this trial relates to.

obsessive-compulsive disorder obsessive-compulsive personality disorder

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Obsessive compulsive disorder OCD

Contacts and locations

Locations

  • University of Chicago Medical Center

    Chicago, Illinois, 60637, United States

More trials for these conditions

Other studies related to the condition(s) this trial covers.