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CompletedNCT05378711Updated May 18, 2022

Evaluating the Results of Physician and Parent Decisions to Treat Selective Mutism With Fluoxetine

A Phase 2 interventional study of Fluoxetine in Selective Mutism and Social Anxiety, sponsored by Michigan State University. Completed at 1 site in United States. Open to participants aged 5 Years to 18 Years. Per ClinicalTrials.gov, last updated 2022-05-18.

Sponsored by Michigan State University · Phase 2, Interventional, and Treatment

From the registry’s dates

  • Registered 4 months after the study started (first participant enrolled Jan 2014, registered May 2014).
Phase
Phase 2
Study type
Interventional
Enrollment
6
Allocation
Not applicable
Ages
5 Years to 18 Years
Sex
All
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Study summary

The Department of Counseling, Educational Psychology, and Special Education and the Department of Psychiatry at Michigan State University have coordinated efforts to provide a diagnostic and treatment investigation for children, ages seven to eighteen, with Selective Mutism. The purpose of this study is to examine the utility of fluoxetine for the treatment of this debilitating disorder. Fluoxetine is expected to improve social anxiety and selective mutism symptomology.

Read the detailed description

Children with selective mutism (SM) are at risk for current and continuing academic and socio-emotional difficulties. Unfortunately, this issue is complicated by the fact these children often respond poorly to psychosocial intervention. This leaves parents with the overwhelming decision to attempt a trial of medication regardless of the little available data on the evidence base of this approach. Despite the paucity of research, psychiatrists are prescribing fluoxetine for children with SM "off label", as the Food and Drug Administration (FDA) has yet to approve fluoxetine for this indication. This study blends the psychopharmacological expertise of psychiatrists with the mental health, systems, and psychological evaluation expertise of school psychologists to identify an appropriate psychopharmacological solution for children and adolescents with this debilitating disorder. To that end, this study will examine the utility of fluoxetine for the treatment of five children and adolescents, ages seven to eighteen, diagnosed with SM through the use of a non-concurrent multiple-baseline single-case design with a single-blind placebo-controlled procedure. Treatment effectiveness will be evaluated by visual analysis of the data, the Wampold and Worsham multiple-baseline design randomization test, and the Kendall's Tau + Mann-Whitney U effect size. Multiple methods of assessment including standardized measures, such as the Selective Mutism Questionnaire (SMQ), and behavior ratings, such as Direct Behavior Ratings (DBRs), will be used to gather baseline and treatment data. Multiple informants (i.e., parents, teachers, and psychiatrists) will provide information on treatment effect across settings (i.e., school and community). Information regarding adverse effects associated with fluoxetine treatment including a measure of behavioral disinhibition, parental acceptance of the fluoxetine intervention, and compliance with taking the medication will also be gathered.

02

Conditions studied

  • Selective Mutism
  • Social Anxiety

Keywords

  • Selective Mutism
  • Social Anxiety
  • Children
  • Adolescents
03

In context

Lead sponsor

Michigan State University is the lead sponsor of 139 studies on the registry; 26 are open to participants now.

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

04

Who can participate

Ages eligible
5 Years to 18 Years
Sexes eligible
All
Accepts healthy volunteers
No

Inclusion criteria

  • Male or female from seven to seventeen years of age at their last birthday
  • Meet DSM-IV-TR criteria for selective mutism
  • No history of medication treatment for selective mutism
  • Child has an immediate biological family member who is diagnosed with an anxiety disorder or has experienced symptoms of an anxiety disorder at some point in time
  • Child has received 10 weeks of an evidence-based psychosocial treatment
  • Child has never had a negative reaction to a psychopharmacological medication
  • Child exhibits symptoms of social anxiety

Exclusion criteria

Exclusion Criteria:

  • Child is diagnosed with a speech condition, mental retardation, pervasive developmental disorder, or schizophrenia
  • Child is an English language learner or from a different culture than the culture predominately represented within his or her school
  • Child is taking or has taken any kind of a psychopharmacological medication (e.g., SSRI, MAO-I, stimulant, etc.)
  • Child has a medical illness that may be complicated through the use of a psychopharmacological treatment
05

Study design

Phase
Phase 2
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
Double
Enrollment
6 participants (actual)

Study arms

  • Experimental
    Fluoxetine

    Children will receive an introductory dose and therapeutic dose of fluoxetine at various time points in the study. Onset of fluoxetine is determined by assignment to a pre-determined randomized treatment schedule.

    Drug: Fluoxetine

Interventions

  • DrugFluoxetine

    Children will receive a placebo or fluoxetine at different times dependent upon random assignment to a treatment schedule.

    Also known as: Prozac

06

What researchers measure

Primary outcomes

  1. Selective Mutism Questionnaire (Change Over 15 Weeks)

    Time frame: 2 times per week for 15 weeks

Secondary outcomes

  1. Multidimensional Anxiety Scale for Children - 2nd Edition (Change Over 15 Weeks)

    Time frame: 2 times per week for 15 weeks

  2. Direct Behavior Ratings - Parent (Change Over 15 Weeks)

    Time frame: Parent (3 times per week for 15 weeks); Teacher (5 times per week for 15 weeks)

  3. Clinical Global Impression (Change Over 15 Weeks)

    Time frame: Parent and Teacher (2 times per week for 15 weeks); Psychiatrist (biweekly for 15 weeks)

  4. Side Effects Form for Children and Adolescents - Adapted (Change Over 15 Weeks)

    Time frame: biweekly for 15 weeks

  5. Parent - Young Mania Rating Scale (Change Over 15 Weeks)

    Time frame: 2 times per week for 15 weeks

  6. Treatment Evaluation Questionnaire - Parent

    Time frame: End of Study (after 15 weeks)

Other outcomes

  1. Treatment Integrity Form

    Time frame: Daily for 15 weeks

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Study locations

1 site
  • Michigan State University Psychiatry Clinic
    East Lansing, Michigan 48824, United States
08

References and documents

Individual participant data

Plan to share: No

No publications or documents are linked to this record.

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on May 18, 2022, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
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Registry details

Key details

Study ID
NCT05378711
Lead sponsor
Michigan State University
Responsible party
Jed Magen (Chair - Department of Psychiatry, Michigan State University) — Principal investigator
First posted
May 18, 2022
Start date
Jan 1, 2014
Primary completion
May 30, 2015
Completion
May 30, 2015
Last update
May 18, 2022

Study contacts

Jed Magen, DO
principal investigator · Michigan State University
John Carlson, PhD
principal investigator · Michigan State University
Justin Barterian, MA
principal investigator · Michigan State University
Joel Sanchez, MD
principal investigator · Michigan State University

Oversight

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

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