|
Cocaine FAQ
Cocaine, Alkalooid obtained from the leaves of the coca plant and used
medically as a local anesthetic (see ANESTHESIA).
It is also widely abused as a drug. Native Americans of the Inca Empire
chewed coca leaves to obtain mild euphoria, stimulation, and alertness.
The drug was first isolated in 1855 and came to be used widely as a local
anesthetic in minor surgery. At present, local anesthetics with less abuse
potential, such as lidocaine, are commonly used instead.
Cocaine has long been known as a drug of abuse, but
it came into particular prominence in the late 1970s and the 1980s. Cocaine
hydrochloride, a water-soluble salt, is a dry white powder (known on the
street as “snow”) that is usually inhaled through a thin tube
inserted into the nostril. More rarely, cocaine is injected into a vein.
Crack the drug may also be smoked in a purified form
through a water pipe (“freebasing”) or in a concentrated form
(“crack”) shaped into pellets and placed in special smoking
gear. Users experience euphoria, exhilaration, and a decreased appetite.
The drug also increases heart rate, elevates blood pressure, and dilates
the pupils. Chronic use can lead to skin abscesses, perforation of the
septum of the nose, weight loss, and damage to the nervous system. Negative
mental effects include extreme restlessness, anxiety, irritability, and,
occasionally, paranoid psychosis. Death from even a small dose can occur,
and is usually caused by seizures or heart attacks.Cocaine is classified
as a narcotic for legal purposes by the United States government. It causes
strong psychological dependence.
Cocaine
Addiction Facts
Cocaine abuse and addiction continues to be
a problem that plagues our nation. In 1997, for example, an estimated
1.5 million Americans age 12 and older were chronic cocaine users.
Although this is an improvement over the 1985 estimate of 5.7 million
users, we still have a substantial distance to go in reducing the
use of this addictive stimulant. Science is helping. For example,
we now know more about where and how cocaine acts in the brain,
including how the drug produces its pleasurable effects and why
it is so addictive.
Through the use of sophisticated technology, scientists can actually
see the dynamic changes that occur in the brain as an individual
takes the drug. They can observe the different brain changes that
occur as a person experiences the "rush," the "high," and, finally,
the craving of cocaine. They can also identify parts of the brain
that become active when a cocaine addict sees or hears environmental
stimuli that trigger the craving for cocaine. Because these types
of studies pinpoint specific brain regions, they are critical to
identifying targets for developing medications to treat cocaine
addiction.
One of NIDA's most important goals is to translate what scientists
learn from research, in order to help the public better understand
drug abuse and addiction, and to develop more effective strategies
for their prevention and treatment. We hope that this compilation
of scientific information on cocaine will help to inform readers
about the harmful effects of cocaine abuse, and that it will assist
in prevention and treatment efforts.
Cocaine use during pregnancy
effects the infants brain
Babies born to mothers who abuse
cocaine during pregnancy often are delivered prematurely, have low
birth weights, smaller head circumferences, and tend to be shorter.
However, the full consequences of prenatal cocaine exposure on children
are still unclear and are difficult to study.
In a series of recently published studies, a team of NIDA-supported
researchers at the University of Maryland, Baltimore, led by Dr.
Michael S. Lidow, examined the effects of prenatal cocaine exposure
in rhesus monkeys. The researchers found that such exposure interferes
with the production of nerve cells and leads to a significant increase
in cell death in the developing cerebral cortex. They also found
that, as a result of these actions of cocaine, the number and density
of nerve cells (neurons) in the cerebral cortex of monkeys born
from cocaine-exposed mothers is reduced, their positioning is abnormal,
and the cortex lacks its usual layered structure.
"The results of these studies provide important information on
the effects of prenatal cocaine exposure on the developing brain,"
says NIDA Director Dr. Alan I. Leshner. "Particularly noteworthy
is the finding that a mother's use of cocaine during pregnancy can
lead to long-lasting abnormalities in her infant's cerebral cortex,
the part of the brain that is largely responsible for our higher
brain functions, including visual perception, social behavior, and
learning, memory and attention."
Cocaine in the
preschools
INDIANAPOLIS, INDIANA
--
A 4-year-old boy brought crack cocaine worth about $10,000 to his
preschool class.
Indianapolis police Sgt. Roger Tuchek said the boy took rocks of
crack cocaine out of his backpack and showed them to other children
in his Head Start class, saying the drugs were flour. Teachers realized
it was cocaine and called authorities.
Nicotine Craving may lead to increased
use of Cocaine Researchers supported
by the National Institute on Drug Abuse (NIDA) have found that craving
for nicotine appears to be linked to increased craving for illicit
drugs among drug abusers who also smoke tobacco. In addition, scientists
say, patients in drug treatment programs may be less likely to successfully
stay off drugs if they are cigarette smokers. These are the findings
from two studies published this month in the journal Experimental
and Clinical Psychopharmacology.
Cocaine Abuse and Addiction may lead to strokes
In 1977, a 43-year-old man
came to an emergency room in New York City after having injected
cocaine into a muscle in his left arm. Between 1 and 2 hours after
the injection, he had begun having trouble speaking and was weak
in his right arm and leg. After performing a brain scan, doctors
at the hospital determined that the man had had a stroke on the
left side of the brain. Although the man also abused other drugs,
the fact that the stroke had occurred shortly after he had injected
cocaine suggested that cocaine had contributed to the stroke. This
case was one of the earliest verified reports of a stroke associated
with cocaine use. In their report, the doctors concluded, "If, in
fact, cocaine played a causal role [in the stroke], we anticipate
that more strokes will be seen among the many abusers of this agent
in American cities."
|