Doxazosin for Psychostimulant Dependence

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: NCT01371851
Recruitment Status : Completed
First Posted : June 13, 2011
Results First Posted : July 27, 2015
Last Update Posted : July 27, 2015
National Institute on Drug Abuse (NIDA)
Baylor College of Medicine
Information provided by (Responsible Party):
University of Arkansas

June 9, 2011
June 13, 2011
June 22, 2015
July 27, 2015
July 27, 2015
June 2011
May 2014   (Final data collection date for primary outcome measure)
Change in Psychostimulant-positive Urines Over Time [ Time Frame: twice-weekly urine samples (8 weeks) ]
Urine samples positive for methamphetamine or cocaine via twice-weekly urine drug screens. Weekly urine results data were averaged within subjects and the mean proportion across subjects within each group was calculated for graphic representation.
First Methamphetamine-Positive Urine [ Time Frame: thrice-weekly urine samples (two weeks) ]
Time to lapse/relapse will be determined via thrice-weekly urine drug screens.
Complete list of historical versions of study NCT01371851 on Archive Site
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Doxazosin for Psychostimulant Dependence
Clinical Efficacy of Doxazosin for Psychostimulant Dependence
Psychostimulant dependence is a major public health problem and no medications have been shown to be very effective in treating this disorder. Thus, the investigators wish to study whether a blood pressure drug thought to reduce drug craving through its interaction at particular adrenergic receptors - doxazosin - can dredge cocaine use relative to placebo in psychostimulant dependent participants enrolled in an 8-week, randomized, double blind, placebo-controlled outpatient clinical trial. Our hypothesis is that doxazosin will reduce cocaine use relative to placebo in psychostimulant dependent participants.
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Phase 1
Phase 2
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple (Participant, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Methamphetamine or Cocaine Dependence
Drug: Doxazosin extended release
initially maintained on doxazosin extended release 4 mg once a day for 7 days, then the dose is increased to 8 mg once per day for the duration of the trial.
  • Experimental: Doxazosin
    Doxazosin extended release will be administered initially at 4 mg/day. On day 8 the dose is increased to 8 mg/day and the participant is maintained on the study until the end of the trial.
    Intervention: Drug: Doxazosin extended release
  • Placebo Comparator: Placebo
    Participants will be maintained on placebo (cellulose) throughout the trial.
    Intervention: Drug: Doxazosin extended release
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*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
May 2014
May 2014   (Final data collection date for primary outcome measure)

Inclusion Criteria:

  • 18-55 years old
  • Methamphetamine OR cocaine dependence, as assessed by the substance abuse section of the Structured Clinical Interview for DSM-IV.
  • At least weekly self-reported methamphetamine OR cocaine use during a preceding three month period
  • Urine toxicology screen positive for methamphetamine or methamphetamine metabolite OR cocaine or cocaine metabolite
  • Women of childbearing age must have a negative pregnancy test, agree to adequate contraception to prevent pregnancy during the study, agree to monthly pregnancy testing and not be nursing

Exclusion Criteria:

  • Suicide attempts within the past 12 months or suicidal ideations or psychotic symptoms in the past 6 months as determined by a study physician.
  • Current opioid, alcohol or sedative physical dependence or dependence on both cocaine and methamphetamine
  • Major cardiovascular disorder that contraindicates study participation (e.g., history of myocardial infarction, stroke, congestive heart failure, cardiac arrhythmia, significant hypertension [i.e., >170 SBP or >110 DBP] or an unstable medical condition (e.g., untreated bacterial infection) as determined by the study physician.
  • Any history or evidence suggestive of seizure disorder or brain injury
  • Subjects needing or planning cataract surgery.
  • History of schizophrenia, major depression, or bipolar type I disorder
  • Organic brain disease or dementia assessed by physician
  • Use of medications that would be expected to have major interaction with doxazosin (e.g. atanazavir, clarithromycin, indinavir, itraconazole, ketoconazole, nefazodone, nelfinavir, ritonavir, saquinavir, telithromycin, or voriconazole or any other potent 3A4 inhibitor.,)
  • Any previous medically adverse reaction to methamphetamine or cocaine, including loss of consciousness, chest pain, or epileptic seizure
  • Medical contraindication to receiving doxazosin (e.g. liver problems or allergies to other to other quinazolines such as prazosin or terazosin)
  • Severe gastrointestinal disorder as determined by physician
  • Liver function tests (i.e., liver enzymes) greater than three times normal levels
  • Systolic blood pressure > 170 mmHg or < 90 mmHg, diastolic blood pressure > 110 mmHg or < 60 mmHg, or heart rate of > 110 beats/min or < 55 beats/min.
  • Supine blood pressure of 100/65 mm Hg or lower, a seated blood pressure of 90/60 mm Hg or lower, or an orthostatic change of >20mm Hg systolic or 10 mm Hg diastolic on standing.
  • Have evidence of untreated or unstable medical illness including: neuroendocrine, autoimmune, renal, hepatic, or active infectious disease
  • Have symptomatic HIV or are taking antiretroviral medication
  • Have asthma or currently use theophylline or other sympathomimetics
  • Participants with estimated glomerular filtration rate < 30 ml/min.
  • Pregnant or nursing female
Sexes Eligible for Study: All
18 Years to 55 Years   (Adult)
Contact information is only displayed when the study is recruiting subjects
United States
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University of Arkansas
University of Arkansas
  • National Institute on Drug Abuse (NIDA)
  • Baylor College of Medicine
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University of Arkansas
July 2015

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP