Clinical Trial Details


Research Study Summary

A Phase 3, Multicenter, Randomized, Double-Blind, Placebo-Controlled Study With an Open-Label Phase to Determine the Efficacy and Safety of Tozadenant as Adjunctive Therapy in Levodopa-Treated Patients With Parkinson's Disease Experiencing End of Dose "Wearing-Off" (TOZ-PD)


Phase 3, international, multicenter, randomized, double-blind, placebo-controlled, parallel-group, 3-arm safety and efficacy study (Part A) with an open-label phase (Part B).

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CW ID: 209893
Date Last Changed: August 18, 2015

Clinical Trial Snapshot

Both Male and Female
30 to 80 Years
Overall Status
Lead Sponsor
Biotie Therapies Inc.
Facility Type


Inclusion Criteria:

  • Patient understands study requirements and has given his/her written informed consent on an Institutional Review Board (IRB) or Independent Ethics Committee (IEC) approved consent form
  • Parkinson's disease diagnosis consistent with UK Parkinson's Disease Society Brain Bank Diagnostic criteria
  • Minimum of 3 years since diagnosis
  • Meet Hoehn and Yahr PD stage
  • Good response to levodopa
  • Stable regimen of anti-PD medications
  • Patients must have been taking a levodopa-containing anti-PD medication continuously for at least the previous 12 months
  • Patient has documented a minimum amount of Off time
  • If of childbearing potential (male and female) must use an acceptable method of contraception

Exclusion Criteria:

  • Previous tozadenant study participation
  • Current or recent participation in another study
  • Secondary or atypical parkinsonism
  • Neurosurgical intervention for PD
  • Patient is taking apomorphine, budipine, istradefylline, tolcapone, or DUOPA™/Duodopa®
  • Treatment with excluded medications
  • Untreated or uncontrolled hyperthyroidism or hypothyroidism
  • Clinically significant out-of-range laboratory
  • MMSE out of range
  • Current episode of major depression (stable treatment for depression is permitted)
  • Recent suicide attempt or suicidal ideation type 4 or type 5 of the Columbia-Suicide Severity Rating Scale (C-SSRS)
  • Women lactating or pregnant
  • Hypersensitivity to any components of tozadenant or excipients
  • Abnormal findings on the physical or neurological examination, or medical history that would make the patient unsuitable for the study
  • History of hepatitis or cholangitis

More Info

Protocol Number: TOZ-CL05

Detailed Description:

During Part A, each patient will participate for up to 30 weeks, which includes a Screening Period of 1 to ≤ 6 weeks, followed by a Baseline Visit and 24 weeks of double-blind treatment: •Screening Period: 1 - 6 weeks. •Double-Blind Treatment Period: 24 weeks. After completion of Part A, patients will continue in Part B for an additional 56 weeks: •Open-Label Treatment Period: 52 weeks. •Post-Treatment Safety Follow Up: 4 weeks.


University of South Florida- Byrd Alzheimer's Institute
4001 East Fletcher Avenue
Tampa, FL 33613
Phone: 813-396-0768

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