Phase III Randomized, Double-Blind, Placebo-Controlled Study of Guanfacine for Tourette Syndrome and Attention Deficit Hyperactivity Disorder

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00004376
Recruitment Status : Completed
First Posted : October 19, 1999
Last Update Posted : June 24, 2005
Yale University
Information provided by:
Office of Rare Diseases (ORD)

Brief Summary:


I. Evaluate the safety and efficacy of the alpha-2 adrenergic agonist guanfacine in children and adolescents with Tourette syndrome or other chronic tic disorder, and attention deficit hyperactivity disorder.

Condition or disease Intervention/treatment Phase
Tourette Syndrome Drug: guanfacine Phase 3

Detailed Description:

PROTOCOL OUTLINE: This is a randomized, double-blind study. Patients are stratified by pubertal status.

There is a 7- to 14-day washout with a placebo prior to treatment for all patients.

The first group receives oral guanfacine 3 times a day for 8 weeks. The dose is gradually increased to minimize sedation; by day 14, most patients are stabilized and the dose is then increased as clinically indicated and tolerated.

The second group receives a placebo 3 times a day for 8 weeks. Patients in either group may be treated with guanfacine for an additional 8 weeks.

Study Type : Interventional  (Clinical Trial)
Enrollment : 35 participants
Primary Purpose: Treatment
Study Start Date : September 1994
Study Completion Date : June 2000

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Ages Eligible for Study:   7 Years to 16 Years   (Child)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No


--Disease Characteristics--

  • Tourette syndrome or other chronic tic disorder meeting Diagnostic and Statistical Manual of Mental Disorders-IV (DSM-IV) criteria
  • DSM-IV diagnosis of attention deficit hyperactivity disorder (ADHD) Clinician's Global Impression for ADHD greater than 4 Hyperactivity Index of Conners Parent or Teacher Questionnaire standard score 65 or higher (1.5 standard deviation units)

--Prior/Concurrent Therapy--

  • At least 2 weeks since medication for tics, ADHD, or obsessive compulsive disorder (4 weeks since neuroleptics or fluoxetine)
  • No failure on prior guanfacine

--Patient Characteristics--

  • Hepatic: No liver failure
  • Renal: No renal failure
  • Cardiovascular: No hypertension No other heart disease
  • Pulmonary: No pulmonary disease
  • Other: No Intelligence Quotient below 80 No current DSM-IV diagnosis of the following: Major depression Bipolar disorder Pervasive developmental disorder Psychotic disorder No seizure disorder No other significant medical condition No pregnant women

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00004376

Sponsors and Collaborators
National Center for Research Resources (NCRR)
Yale University
Study Chair: Lawrence Scahill Yale University Identifier: NCT00004376     History of Changes
Other Study ID Numbers: 199/11979
First Posted: October 19, 1999    Key Record Dates
Last Update Posted: June 24, 2005
Last Verified: March 2001

Keywords provided by Office of Rare Diseases (ORD):
Tourette syndrome
neurologic and psychiatric disorders
rare disease

Additional relevant MeSH terms:
Attention Deficit Disorder with Hyperactivity
Tourette Syndrome
Pathologic Processes
Attention Deficit and Disruptive Behavior Disorders
Neurodevelopmental Disorders
Mental Disorders
Basal Ganglia Diseases
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Tic Disorders
Movement Disorders
Heredodegenerative Disorders, Nervous System
Neurodegenerative Diseases
Genetic Diseases, Inborn
Antihypertensive Agents
Adrenergic alpha-2 Receptor Agonists
Adrenergic alpha-Agonists
Adrenergic Agonists
Adrenergic Agents
Neurotransmitter Agents
Molecular Mechanisms of Pharmacological Action
Physiological Effects of Drugs