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CompletedNCT00988624Updated Jan 12, 2010

A Study In Healthy Volunteers To Estimate The Pharmacokinetics Of Four Modified-Release Formulations Of Dimebon (Latrepirdine)

A Phase 1 interventional study of Dimebon IR Tablet and Dimebon MR1 in Alzheimer's Disease and Huntington Disease, sponsored by Pfizer. Completed at 1 site in United States. Open to participants aged 18 Years to 55 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2010-01-12.

Sponsored by Pfizer · Phase 1 and Interventional

Phase
Phase 1
Study type
Interventional
Enrollment
20
Allocation
Randomized
Ages
18 Years to 55 Years
Sex
All
01

Study summary

This study will evaluate four different modified release formulation to estimate the amount of dimebon available to the body relative to the current dimebon formulation that is given three times a day. The results of this study will help inform and guide further formulation development efforts with the ultimate goal of reducing dose frequency to once-a-day or twice-a-day.

02

Conditions studied

  • Alzheimer's Disease
  • Huntington Disease

Keywords

  • bioavailability pharmacokinetics Alzheimer's Disease Huntington Disease
03

In context

Alzheimer Disease

3,678 studies on the registry are indexed under Alzheimer Disease; 872 are open to participants now.

This study's enrollment of 20 is below the median of 70 across 2,808 interventional studies indexed under Alzheimer Disease.

Browse Alzheimer Disease studies →

Lead sponsor

Pfizer is the lead sponsor of 3,244 studies on the registry; 139 are open to participants now.

Of its 582 completed or terminated interventional studies of FDA-regulated products, 381 (65%) have results posted.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 55 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Inclusion criteria

  • Healthy male and/or female subjects between the ages of 18 and 55 years, inclusive.

Body Mass Index (BMI) of 17.5 to 30.5 kg/m2; and a total body weight >50 kg (110 lbs).

Exclusion criteria

Exclusion Criteria:

  • Evidence or history of clinically significant hematological, renal, endocrine, pulmonary, gastrointestinal, cardiovascular, hepatic, psychiatric, neurologic, or allergic disease (including drug allergies, but excluding untreated, asymptomatic, seasonal allergies at time of dosing).
  • Subjects with any history of a previous seizure (including childhood febrile seizures) or convulsion or significant head trauma.
  • Subjects with hypersensitivity reactions to dimebon or other antihistamines.
  • Any condition possibly affecting drug absorption (eg, gastrectomy).
  • Smokers who use greater than 5 cigarettes per day.
  • Use of proton pump inhibitors, antacids, and H2-blockers are prohibited for the duration of the study.
  • Pregnant or nursing females; females of childbearing potential who are unwilling or unable to use an acceptable method of non-hormonal contraception.
05

Study design

Phase
Phase 1
Allocation
Randomized
Intervention model
Crossover assignment
Masking
None (open label)
Enrollment
20 participants (actual)

Study arms

  • Experimental
    Period 1

    Drug: Dimebon IR Tablet

  • Experimental
    Period 2

    Drug: Dimebon MR1

  • Experimental
    Period 3

    Drug: Dimebon MR2

  • Experimental
    Period 4

    Drug: Dimebon MR3

  • Experimental
    Period 5

    Drug: Dimebon MR4

Interventions

  • DrugDimebon IR Tablet

    Pharmacokinetics of a single oral dose of 10 mg dimebon immediate release tablet will be assessed on Day 1 - 3.

  • DrugDimebon MR1

    Pharmacokinetics of a single oral dose of 10 mg dimebon modified release formulation, MR1, will be assessed on Day 1 - 3.

  • DrugDimebon MR2

    Pharmacokinetics of a single oral dose of 10 mg dimebon modified release formulation, MR2, will be assessed on Day 1 - 3.

  • DrugDimebon MR3

    Pharmacokinetics of a single oral dose of 10 mg dimebon modified release formulation, MR3, will be assessed on Day 1 - 3.

  • DrugDimebon MR4

    Pharmacokinetics of a single oral dose of 10 mg dimebon modified release formulation, MR4, will be assessed on Day 1 - 3.

06

What researchers measure

Primary outcomes

  1. PK endpoints for dimebon and M7 (where appropriate) for each formulation: AUC0-24, AUC0-24(dn), AUCinf (as data permit) AUCinf(dn), AUClast, AUClast(dn), Tlag, Cmax, Tmax, and t1/2 (as data permit).

    Time frame: Day 1-3 of Period 1, 2, 3, 4, or 5

Secondary outcomes

  1. Safety and tolerability for each formulation (AEs, ECG, vital signs, safety labs)

    Time frame: Day 1-3 of Period 1, 2, 3, 4, or 5

07

Study locations

1 site
  • Pfizer Investigational Site
    New Haven, Connecticut 06511, United States
08

References and documents

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Jan 12, 2010, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT00988624
Lead sponsor
Pfizer
Collaborators
Medivation, Inc.
First posted
Oct 2, 2009
Start date
Oct 2009
Primary completion
Dec 2009
Completion
Dec 2009
Last update
Jan 12, 2010

Study contacts

Pfizer CT.gov Call Center
study director · Pfizer

Oversight

Data monitoring committee
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Jan 2010. You cannot join it, but the record below documents what was studied.

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