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NCT Number: NCT00838110

A Phase 3 Study To Evaluate The Safety And Tolerability Of Dimebon Patients With Mild To Moderate Alzheimer's Disease

This is a multi-center, randomized, double-blind placebo-controlled safety study conducted in 2 study cohorts. In Cohort 1, subjects with Alzheimer's disease (n=250) will receive Dimebon 20 mg or placebo TID for 26 weeks. In Cohort 2 AD subjects (n=500) will be treated with Dimebon 20 mg or placebo TID for 12 weeks After completion of the randomized portion of the study, subjects in both Cohorts will have the opportunity to enroll in a Dimebon open label extension study.

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Key information

Conditions

Alzheimer's Disease Alzheimer Disease Brain Diseases Central Nervous System Diseases Dementia Mental Disorders Nervous System Diseases Neurocognitive Disorders Neurodegenerative Diseases Tauopathies

Age range

50 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 3

Primary location

Pfizer Investigational Site, Calgary, Alberta, Canada

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Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Diagnosis of Alzheimer's Disease.
  • MMSE 12-26 inclusive.
  • If on existing anti-dementia therapy, have been on a stable dose of anti-dementia therapy (cholinesterase inhibitors and/or memantine) for at least 60 days prior to dosing in study.
  • If not taking existing anti-dementia therapy, have not received therapy with cholinesterase inhibitors and/or memantine within 60 days prior to dosing in this study.

Exclusion criteria

  • Have major structural brain disease (e.g., ischemic infarcts, subdural hematoma, hemorrhage, hydrocephalus, brain tumors, multiple subcortical ischemic lesions, or a single lesion in a critical region [e.g., thalamus, hippocampus]).
  • Have any major medical illness or unstable medical condition within six months of screening that may interfere with the patient's ability to comply with study procedures and abide by study restrictions.
  • Have not been on a stable dose of anti-dementia therapy for at least 60 days prior to dosing or intend to start anti-dementia therapy during the double blind portion of the study.
  • Reside in a nursing home or assisted care facility with need for 24-hour care and supervision.

Treatment and study plan

Dimebon

Drug

10 mg TID for week 1 followed by 20 mg TID through Week 26

Placebo

Drug

10 mg TID for week 1 followed by 20 mg TID through Week 26

Primary outcomes

  1. Percentage of Participants With Abnormal Clinically Significant Vital Signs in Cohort 1

    Time frame: Baseline up to Week 30 (follow-up)

    Abnormal clinically significant vital signs included absolute systolic blood pressure (BP) values: less than (<) 90 millimeter of mercury (mmHg), maximum increase or decrease of greater than or equal to (>=) 30 mmHg from baseline; absolute diastolic BP value: <50 mmHg, maximum increase or decrease of >=20 mmHg from baseline; absolute heart rate values: >120 beats per minute (bpm).

  2. Percentage of Participants With Abnormal Clinically Significant Vital Signs in Cohort 2

    Time frame: Baseline up to Week 16 (follow-up)

    Abnormal clinically significant vital signs included absolute systolic BP values: <90 mmHg, maximum increase or decrease of >=30 mmHg from baseline; absolute diastolic BP values: <50 mmHg, maximum increase or decrease of >=20 mmHg from baseline; absolute heart rate values: >120 bpm.

  3. Percentage of Participants With Abnormal Clinically Significant Electrocardiogram (ECG) Findings in Cohort 1

    Time frame: Baseline up to Week 30 (follow-up)

    Abnormal ECG findings included maximum value of >=300 millisecond (msec), maximum increase of >=25% for baseline value of >200 msec and maximum increase of >=50% for baseline value of <=200 msec for PR interval (int); maximum value of >=200 msec, maximum increase of >=25% for baseline value of >100 msec and maximum increase of >=50% for baseline value of <=100 msec for QRS interval; maximum value of >=500 msec for QT interval; maximum value of 450 to <480, 480 to <500 and >=500 msec, increase of >=30 to <60 and >=60 msec for QT interval corrected using Fridericia's formula (QTcF interval).

  4. Percentage of Participants With Abnormal Clinically Significant Electrocardiogram (ECG) Findings in Cohort 2

    Time frame: Baseline up to Week 16 (follow-up)

    Abnormal ECG findings included maximum value of >=300 msec, maximum increase of >=25% for baseline value of >200 msec and maximum increase of >=50% for baseline value of <=200 msec for PR interval; maximum value of >=200 msec, maximum increase of >=25% for baseline value of >100 msec and maximum increase of >=50% for baseline value of <=100 msec for QRS interval; maximum value of >=500 msec for QT interval; maximum value of 450 to <480, 480 to <500 and >=500 msec, increase of >=30 to <60 and >=60 msec for QT interval corrected using Fridericia's formula (QTcF interval).

  5. Percentage of Participants With Abnormal Clinically Significant Laboratory Values in Cohort 1

    Time frame: Baseline up to Week 30 (follow-up)

    For hematology, liver function, renal function, electrolytes, clinical chemistry, abnormality was reported if the observed value was more than or less than X times the upper limit of normal (ULN) or lower limit of normal (LLN) respectively; X=specified in categories of each parameter in the measured values section. For urinalysis of glucose, ketones, protein, blood, abnormality was reported if result was >=1 in qualitative test of respective parameters, indicating levels in urine were abnormal. Urine pH and specific gravity abnormality reported if pH >8 and specific gravity <1.003 or >1.030.

  6. Percentage of Participants With Abnormal Clinically Significant Laboratory Values in Cohort 2

    Time frame: Baseline up to Week 16 (follow-up)

    For hematology, liver function, renal function, electrolytes, clinical chemistry, abnormality was reported if the observed value was more than or less than X times the ULN or LLN respectively; X=specified in categories of each parameter in the measured values section. For urinalysis of glucose, ketones, protein, blood, abnormality was reported if result was >=1 in qualitative test of respective parameters, indicating levels in urine were abnormal. Urine pH and specific gravity abnormality reported if pH >8 and specific gravity <1.003 or >1.030.

  7. Percentage of Participants With Adverse Events (AEs) in Cohort 1

    Time frame: Baseline up to Week 30 (follow-up)

    An AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship.

  8. Percentage of Participants With Adverse Events (AEs) in Cohort 2

    Time frame: Baseline up to Week 16 (follow-up)

    An AE was any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship.

Sponsors and collaborators

Lead sponsor

Pfizer

Industry

Collaborators

  • Medivation, Inc.

Registry information

Official study title

A Phase 3, Multi-Center, Randomized, Double-Blind Placebo-Controlled Study To Evaluate The Safety And Tolerability Of Dimebon (PF-01913539) For Up To 26-Weeks In Patients With Mild To Moderate Alzheimer's Disease

Important dates

Study start
2009
Primary completion
2010
Study completion
2010
First posted
Feb 6, 2009
Registry last updated
Dec 6, 2018

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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