Completed

A Multicenter, Randomized, Double-Blind, Placebo-Controlled, Parallel Group Study To Evaluate The Efficacy And Safety Of Three Fixed Doses (100 Mg, 200 Mg, Or 400 Mg) Of DVS-233 SR In Adult Outpatients With Major Depressive Disorder

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What is being tested

Data Collection

Who is being recruted

Mental Disorders
+3

+ Behavioral Symptoms
+ Depression
From 18 to 75 Years
See all eligibility criteria
How is the trial designed

Treatment Study

Phase 3
Interventional
See protocol details

Summary

Principal SponsorWyeth is now a wholly owned subsidiary of Pfizer
Last updated: January 14, 2026
Sourced from a government-validated database.Claim as a partner

To compare the antidepressant efficacy and safety of subjects receiving DVS-233 SR versus subjects receiving placebo.

Official TitleA Multicenter, Randomized, Double-Blind, Placebo-Controlled, Parallel Group Study To Evaluate The Efficacy And Safety Of Three Fixed Doses (100 Mg, 200 Mg, Or 400 Mg) Of DVS-233 SR In Adult Outpatients With Major Depressive Disorder 
NCT00072774
Principal SponsorWyeth is now a wholly owned subsidiary of Pfizer
Last updated: January 14, 2026
Sourced from a government-validated database.Claim as a partner

Protocol

This section provides details of the study plan, including how the study is designed and what the study is measuring.
Design Details
480 patients to be enrolledTotal number of participants that the clinical trial aims to recruit.
Treatment Study
These studies test new ways to treat a disease, condition, or health issue. The goal is to see if a new drug, therapy, or approach works better or has fewer side effects than existing options.

How participants are assigned to different groups/arms
In this clinical study, participants are placed into groups randomly, like flipping a coin. This ensures that the study is fair and unbiased, making the results more reliable. By assigning participants by chance, researchers can better compare treatments without external influences.

Other Ways to Assign Participants
Non-randomized allocation: Participants are assigned based on specific factors, such as their medical condition or a doctor's decision.
None (Single-arm trial): If the study has only one group, all participants receive the same treatment, and no allocation is needed.

How treatments are given to participants
Participants are divided into different groups, each receiving a specific treatment at the same time. This helps researchers compare how well different treatments work against each other.

Other Ways to Assign Treatments
Single-group assignment: Everyone gets the same treatment.
Cross-over assignment: Participants switch between treatments during the study.
Factorial assignment: Participants receive different combinations of treatments.
Sequential assignment: Participants receive treatments one after another in a specific order, possibly based on individual responses.
Other assignment: Treatment assignment does not follow a standard or predefined design.

How the interventions assigned to participants is kept confidential
Neither participants nor researchers know who is receiving which treatment. This is the most rigorous way to reduce bias, ensuring that expectations do not influence the results.

Other Ways to Mask Information
Open-label: Everyone knows which treatment is being given.
Single-blind: Participants do not know which treatment they are receiving, but researchers do.
Triple-blind: Participants, researchers, and outcome assessors do not know which treatment is given.
Quadruple-blind: Participants, researchers, outcome assessors, and care providers all do not know which treatment is given.

Eligibility

Researchers look for people who fit a certain description, called eligibility criteria: person's general health condition or prior treatments.
Conditions
Criteria
Any sexBiological sex of participants that are eligible to enroll.
From 18 to 75 YearsRange of ages for which participants are eligible to join.
Healthy volunteers not allowedIf individuals who are healthy and do not have the condition being studied can participate.
Conditions
Pathology
Mental Disorders
Behavioral Symptoms
Depression
Depressive Disorder, Major
Depressive Disorder
Mood Disorders
Criteria

Inclusion Criteria: * Outpatients * Sexually active women participating in the study must use a medically acceptable form of contraception * Subjects must have a primary diagnosis of major depressive disorder Exclusion Criteria: * Treatment with DVS-233 SR at any time in the past * Treatment with venlafaxine (immediate release \[IR\] or extended release \[ER\]) within 90 days of study day 1 * Known hypersensitivity to venlafaxine (IR or ER)

Study Centers

These are the hospitals, clinics, or research facilities where the trial is being conducted. You can find the location closest to you and its status.
This study has no location dataSave this study to your profile to know when the location data is available. 
CompletedNo study centers