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A Study of the Safety and Efficacy of Memantine in Moderate to Severe Alzheimer's Disease

This study has been completed.
Information provided by:
Forest Laboratories Identifier:
First received: May 3, 2006
Last updated: August 25, 2010
Last verified: August 2010
Results First Received: July 20, 2010  
Study Type: Interventional
Study Design: Allocation: Randomized;   Intervention Model: Parallel Assignment;   Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor);   Primary Purpose: Treatment
Condition: Dementia of the Alzheimer's Type
Interventions: Drug: memantine ER
Drug: Placebo

  Participant Flow
  Hide Participant Flow

Recruitment Details
Key information relevant to the recruitment process for the overall study, such as dates of the recruitment period and locations
The recruitment period was from May 20, 2005 to April 18th, 2007 at 83 study centers in four countries (23 in Argentina, 11 in Chile, 11 in Mexico, and 38 in the US)

Pre-Assignment Details
Significant events and approaches for the overall study following participant enrollment, but prior to group assignment
Study consisted of 1-2 weeks single-blind placebo treatment followed by 24 weeks double-blind treatment. At the end of single-blind placebo treatment, patients meeting entry criteria were randomized (1:1) to 1 of 2 double-blind treatment groups receiving memantine or placebo.

Reporting Groups
Placebo Matching placebo oral administration once daily for 24 weeks.
Memantine ER 28mg once daily oral administration for 24 weeks.

Participant Flow:   Overall Study
    Placebo   Memantine ER
STARTED   335 [1]   342 [2] 
SAFETY POPULATION   335 [3]   341 [4] 
COMPLETED   272   273 
NOT COMPLETED   63   69 
Adverse Event                21                34 
Protocol Violation                6                14 
Withdrawal by Subject                18                10 
Lack of Efficacy                8                3 
Lost to Follow-up                5                4 
Withdrawn for other reasons                5                4 
[1] Randomized to placebo
[2] Randomized to Memantine ER
[3] Safety population defined as all patients who took at least one dose of double-blind study drug.
[4] Safety population: one patient was randomized but did not receive double-blind study drug.

  Baseline Characteristics

  Outcome Measures
  Show All Outcome Measures

1.  Primary:   Change From Baseline in Severe Impairment Battery (SIB) at Week 24 (LOCF)   [ Time Frame: Baseline to week 24 ]

2.  Primary:   Clinician’s Interview-Based Impression of Change With Caregiver Input (CIBIC-plus) at Week 24 (LOCF)   [ Time Frame: Week 24 ]

3.  Secondary:   Change From Baseline in the 19-Item Alzheimer’s Disease Cooperative Study-Activities of Daily Living (ADCS-ADL19) Scale at Week 24 (LOCF)   [ Time Frame: Baseline to week 24 ]

  Serious Adverse Events

  Other Adverse Events

  Limitations and Caveats
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Limitations of the study, such as early termination leading to small numbers of participants analyzed and technical problems with measurement leading to unreliable or uninterpretable data
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