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Drug Discrimination in Methadone-Maintained Humans Study 3 (OMDD3)

This study has been completed.
National Institute on Drug Abuse (NIDA)
Information provided by (Responsible Party):
University of Arkansas Identifier:
First received: February 12, 2010
Last updated: March 6, 2013
Last verified: March 2013
This study involves giving psychoactive drugs intramuscularly (injected into the muscle of the upper arm or the hip) and/or orally, and measuring the participant's ability to tell the difference between one drug and another, as well as measuring the effects of the drugs on mood, physiology (e.g., heart rate, blood pressure, respiration rate) and behavior. Each participant will receive 2-4 of the listed interventions.

Condition Intervention Phase
Drug Dependence
Drug: 2-4 of the drugs listed below
Phase 1

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: Double Blind (Participant, Investigator)
Primary Purpose: Basic Science
Official Title: Drug Discrimination in Methadone-Maintained Humans Study 3

Resource links provided by NLM:

Further study details as provided by University of Arkansas:

Primary Outcome Measures:
  • Drug Discrimination Performance [ Time Frame: Every Session ]

Secondary Outcome Measures:
  • Self-Report Ratings [ Time Frame: Every Session ]
  • Vital Signs [ Time Frame: Every session ]
  • ECG [ Time Frame: Test Sessions ]

Enrollment: 9
Study Start Date: February 2010
Study Completion Date: November 2012
Primary Completion Date: October 2012 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 1
Receives 2-4 of the drugs listed under Intervention
Drug: 2-4 of the drugs listed below
Cycloserine: 500, 675, 750 mg oral capsules may possibly given. Naloxone: 0.15mg/70Kg or 0.2mg/70kg I.M. injection may possibly be given. Nifedipine: 10, 20 mg oral capsules may possibly be given. Placebo (sugar pill or microcrystalline cellulose): oral capsules may be given. Saline: I.M. injection may possibly be given. Tizanidine: 4, 8, 12 mg oral capsules may possibly be given. Verapamil: 30, 60, 120 mg oral capsules may possibly be given.
Other Names:
  • Cycloserine: Seromycin
  • Naloxone: Narcan
  • Nifedipine: Adalat, Procardia
  • Placebo
  • Saline
  • Tizanidine: Zanaflex
  • Verapamil: Veralan


Ages Eligible for Study:   18 Years to 65 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  1. Must be between the ages of 18-65.
  2. Participation in the UAMS Substance Abuse Treatment Clinic Methadone Maintenance Program or the CATAR Clinic Little Rock with maintenance on a stable dose of methadone (+ or - 10 mg) for at least 1 month prior to study entry.
  3. Subjects would have to be in "good standing" in the methadone maintenance program in order to participate; i.e., compliance with scheduled medication and group therapy session hours. This would be defined as < 3 missed methadone medications and missed < 3 group and <3 individual therapy sessions in the two months prior to study participation
  4. Subjects must submit a urine sample negative for illicit drugs prior to study entry.
  5. Subjects must be able to read and understand English.

Exclusion Criteria:

  1. Unstable medical condition (e.g., major, unstable cardiovascular, renal, endocrine or hepatic disease) or stable medical condition requiring treatment that would interact with study medications (e.g., controlled hypertension on an antihypertensive) or ability to participate in study sessions, (e.g.,chronic back pain that would preclude being able to sit for long periods, etc), to be determined by history provided by the prospective subject or laboratory evaluation and physical examination as outlined below. These would be determined by the study physician alone or in consultation with the PI.
  2. Current diagnosis of other drug or alcohol physical dependence (other than tobacco).
  3. History of major psychiatric disorder (psychosis, schizophrenia, bipolar) or current psychiatric disorder that requires medication (e.g., current major depression).
  4. Pregnancy, plans to become pregnant or inadequate birth control (adequate birth control includes an IUD, condoms, birth control pills, etc). Male participants are encouraged to use condoms because little has been studied on the effects of these drugs on the male reproductive system.
  5. Present or recent use of over-the-counter psychoactive drug, prescription psychoactive drug (antidepressants, anxiolytics, antipsychotics and anticonvulsants that may also be used for mood stabilization or sleep disruption) or drug (e.g., ciprofloxacin, fluvoxamine) that would have major interaction with drugs to be tested.
  6. Liver function tests greater than 3 times normal, BUN and Creatinine outside normal range, or thyroid function tests outside normal range.
  7. A supine or semi-recumbent blood pressure of 100/65mmHg, a seated blood pressure of 90/60mmHg, or orthostatic change of >20mmHg systolic or >10mmHg diastolic on standing or heart rate less than 60 beats/min.
  8. EKG abnormalities including but not limited to: bradycardia (<60 bpm); prolonged QTc interval (>450 msec); Wolff-Parkinson White syndrome; wide complex tachycardia; 2nd degree, Mobitz type II heart block; 3rd degree heart block; left or right bundle branch block.
  9. Participants who become arrested and/or incarcerated will not be allowed to continue to participate.
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Please refer to this study by its identifier: NCT01068847

United States, Arkansas
University of Arkansas for Medical Sciences
Little Rock, Arkansas, United States, 72205
Sponsors and Collaborators
University of Arkansas
National Institute on Drug Abuse (NIDA)
Principal Investigator: Alison Oliveto, Ph.D. University of Arkansas
  More Information

Responsible Party: University of Arkansas Identifier: NCT01068847     History of Changes
Other Study ID Numbers: R01DA010017-03 ( US NIH Grant/Contract Award Number )
R01DA010017 ( US NIH Grant/Contract Award Number )
DPMC ( Other Identifier: NIDA )
Study First Received: February 12, 2010
Last Updated: March 6, 2013

Keywords provided by University of Arkansas:
Opioid dependence

Additional relevant MeSH terms:
Substance-Related Disorders
Chemically-Induced Disorders
Mental Disorders
Analgesics, Opioid
Central Nervous System Depressants
Physiological Effects of Drugs
Sensory System Agents
Peripheral Nervous System Agents
Antitussive Agents
Respiratory System Agents
Anti-Arrhythmia Agents
Calcium Channel Blockers
Membrane Transport Modulators
Molecular Mechanisms of Pharmacological Action
Vasodilator Agents
Narcotic Antagonists
Muscle Relaxants, Central
Neuromuscular Agents
Autonomic Agents
Adrenergic alpha-2 Receptor Agonists processed this record on April 25, 2017