Effects of N-acetylcysteine on Brain Chemistry and Behavior in Cocaine Abusers (NAC)
| Status: | Completed |
|---|---|
| Conditions: | Psychiatric, Psychiatric, Pulmonary |
| Therapuetic Areas: | Psychiatry / Psychology, Pulmonary / Respiratory Diseases |
| Healthy: | No |
| Age Range: | 18 - 55 |
| Updated: | 4/17/2018 |
| Start Date: | July 2011 |
| End Date: | June 2017 |
Effects of N-acetylcysteine on Brain Chemistry and Behavior in Cocaine Abusers
N-acetylcysteine (NAC) is a medication that the Food and Drug Administration (FDA) has
approved for several medical uses, such as dissolving mucus in patients with breathing
problems, treating overdose from acetaminophen (Tylenol), and protecting the kidneys from
toxic substances.
Some recent studies suggest that NAC could be useful in the treatment of other disorders
including addictions. One purpose of this study is to determine whether NAC alters the level
of brain glutamate (a chemical that excites brain cells). The other main purpose is to
determine whether NAC affects how much cocaine people use.
approved for several medical uses, such as dissolving mucus in patients with breathing
problems, treating overdose from acetaminophen (Tylenol), and protecting the kidneys from
toxic substances.
Some recent studies suggest that NAC could be useful in the treatment of other disorders
including addictions. One purpose of this study is to determine whether NAC alters the level
of brain glutamate (a chemical that excites brain cells). The other main purpose is to
determine whether NAC affects how much cocaine people use.
Inpatient Phase: Participants will live on an inpatient research unit at least 2 consecutive
nights and possibly up to 20 consecutive nights. Participants cannot have visitors and will
not be allowed to leave the inpatient unit (except with a staff escort) unless they drop out
of the study. We will collect daily urine samples to make sure participants are not using any
drugs except those in the study. In addition, each morning, afternoon and evening
participants will receive a capsule containing placebo (a blank) or different doses of
N-acetylcysteine.
Participants will take part in multiple trials (up to 9 sessions) where they will be given a
standard amount of powder (identified as Drug A or Drug B) to inhale through a straw into
their nose. The powder will contain placebo (a powder containing no drug) or different doses
of cocaine. We will measure how participants are feeling using questionnaires and we will
record vital signs—including breathing rate, blood oxygen level, heart rate, and blood
pressure.
Participants will also be asked to perform a 3-hour computer task that allows them to work
for Drug A, Drug B, or money. At the end of the computer task participants will receive the
amount of drug they earned and a receipt for the amount of money they earned.
On each Monday of the inpatient stay, participants will be escorted to Harper Hospital for a
special type of magnetic resonance imaging (MRI) scan, known as magnetic resonance
spectroscopy (MRS). This is a non-invasive way to study brain chemistry. Participants will
take part in a total of two (2) MRI scans. The total length of each brain scan will be about
2 hours.
Additionally on each Monday of the inpatient stay we will test the sensitivity of the
participants brain to magnetic stimulation. A small magnet will be placed on top of the head
so that a small electrical current is generated inside the brain. This procedure is called
transcranial magnetic stimulation (TMS). We will stimulate the part of the brain that
controls finger movement. Three recording electrodes (metal sensors like those used for EKG)
will be placed on the right thumb and index fingers. We will measure the effects of different
amounts of magnetic stimulation on the muscle activity of the thumb and index fingers (as
seen on a computer screen). We will also ask participants to push a lever with their finger
during parts of the procedure. These tasks will last about 2 hours.
To complete the study, a minimum stay of 16 inpatient nights is required. The maximum stay is
20 inpatient nights.
nights and possibly up to 20 consecutive nights. Participants cannot have visitors and will
not be allowed to leave the inpatient unit (except with a staff escort) unless they drop out
of the study. We will collect daily urine samples to make sure participants are not using any
drugs except those in the study. In addition, each morning, afternoon and evening
participants will receive a capsule containing placebo (a blank) or different doses of
N-acetylcysteine.
Participants will take part in multiple trials (up to 9 sessions) where they will be given a
standard amount of powder (identified as Drug A or Drug B) to inhale through a straw into
their nose. The powder will contain placebo (a powder containing no drug) or different doses
of cocaine. We will measure how participants are feeling using questionnaires and we will
record vital signs—including breathing rate, blood oxygen level, heart rate, and blood
pressure.
Participants will also be asked to perform a 3-hour computer task that allows them to work
for Drug A, Drug B, or money. At the end of the computer task participants will receive the
amount of drug they earned and a receipt for the amount of money they earned.
On each Monday of the inpatient stay, participants will be escorted to Harper Hospital for a
special type of magnetic resonance imaging (MRI) scan, known as magnetic resonance
spectroscopy (MRS). This is a non-invasive way to study brain chemistry. Participants will
take part in a total of two (2) MRI scans. The total length of each brain scan will be about
2 hours.
Additionally on each Monday of the inpatient stay we will test the sensitivity of the
participants brain to magnetic stimulation. A small magnet will be placed on top of the head
so that a small electrical current is generated inside the brain. This procedure is called
transcranial magnetic stimulation (TMS). We will stimulate the part of the brain that
controls finger movement. Three recording electrodes (metal sensors like those used for EKG)
will be placed on the right thumb and index fingers. We will measure the effects of different
amounts of magnetic stimulation on the muscle activity of the thumb and index fingers (as
seen on a computer screen). We will also ask participants to push a lever with their finger
during parts of the procedure. These tasks will last about 2 hours.
To complete the study, a minimum stay of 16 inpatient nights is required. The maximum stay is
20 inpatient nights.
Inclusion Criteria:
- Male and female volunteers (18-55 years of age)
- Must meet DSM-IV criteria for current Cocaine Abuse or Dependence and wish to
participate in research.
- Positive urine test for cocaine.
- Candidates must be in good health to be eligible.
- All candidates must receive routine medical (history and physical) exam with standard
laboratory tests (complete blood chemistry, urinalysis, urine pregnancy test for
females, tuberculin screening), and 12-lead ECG at the initial screening visit.
Exclusion Criteria:
- Serious psychiatric illness (e.g. psychosis, bipolar, suicide attempts, major
depression that is not substance-induced).
- Substance use disorder other than cocaine abuse or dependence, nicotine dependence,
alcohol abuse, sedative abuse or marijuana abuse.
- Neurological diseases (e.g. stroke, seizures); cardiovascular problems (e.g.
myocardial infarction, angina, systolic BP >160 or <95 mmHg, diastolic BP >95 mmHg, or
clinically abnormal ECG); pulmonary diseases (e.g. asthma, TB); systemic diseases
(e.g. hepatitis, autoimmune diseases).
- Cognitive impairment.
- Exposed in past 30 days to medications that would increase study risk (e.g. toxicity
to major organ systems, psychotropics, asthma inhalers, or interactions with study
drugs).
- Pregnant (urine HCG), lactating (self-report), or if heterosexually active and not
using (self-report) medically approved birth control measures (oral or depot
contraceptives, IUD, condom/foam, sterilization, tubal ligation).
- Seeking treatment or being treated for a substance use disorder.
- Metal objects in body (e.g. metal plates, part of a bullet from a gunshot wound, or a
catheter).
We found this trial at
1
site
5050 Anthony Wayne Dr
Detroit, Michigan 48201
Detroit, Michigan 48201
(313) 577-2424
Principal Investigator: Mark Greenwald, PhD
Phone: 313-993-3966
Wayne State University Founded in 1868, Wayne State University is a nationally recognized metropolitan research...
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