Cannabis use disorder Insomnia

- Mei 14, 2017

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Cannabis use disorder or cannabis dependence is defined in the fifth revision of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) as the continued use of cannabis despite clinically significant impairment, ranging from mild to severe.

Cannabis is one of the most widely used drugs in the world. In the United States, 49% of people have used cannabis. Although physical addiction has not been proven, an estimated 9% of those who use cannabis develop dependence. In the US, as of 2013, cannabis is the most commonly identified illicit substance used by people admitted to treatment facilities. Demand for treatment for cannabis use disorder increased internationally between 1995 and 2002.


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Signs and symptoms

Although not medically serious, cannabis withdrawal symptoms can occur in one half of patients in treatment for cannabis use disorders. These symptoms include dysphoria (anxiety, irritability, depression, restlessness), disturbed sleep, gastrointestinal symptoms, and decreased appetite. Most symptoms begin during the first week of abstinence and resolve after a few weeks. According to the National Cannabis Prevention and Information Centre in Australia, a sign of cannabis dependence is that the person spends noticeably more time than the average recreational user, recovering from the use of, or obtaining cannabis. For some, using cannabis becomes a large part of the person's life and he or she may miss important activities, preferring to use cannabis instead. People who are cannabis dependent will continue to use it even though they perceive their use as problematic.

Mental health problems

Cannabis use is associated with comorbid mental health problems, such as mood and anxiety disorders, and discontinuing cannabis use is difficult for some users. Psychiatric comorbidities are often present in dependent cannabis users including a range of personality disorders.


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Cause

Cannabis dependency is often due to prolonged and increasing use of the drug. Increasing the strength of the cannabis taken and an increasing use of more effective methods of delivery often increase the progression of cannabis dependency. The use of cannabis at a young age such as the teenage years, can have serious impacts on depression and anxiety in youth and later in life.

Risk factors

Dependence on cannabis is more common among heavy users. Marijuana use can lead to increased tolerance and, in some users, withdrawal symptoms when trying to stop. Prolonged marijuana use produces both pharmacokinetic changes (how the drug is absorbed, distributed, metabolized, and excreted) and pharmacodynamic changes (how the drug interacts with target cells) to the body. These changes require the user to consume higher doses of the drug to achieve a common desirable effect (known as a higher tolerance), reinforcing the body's metabolic systems for eliminating the drug more efficiently and further downregulating cannabinoid receptors in the brain. These effects compound themselves in that the chronic user must consume more frequently to overcome the accelerated clearance, and higher doses to overcome the blunted response to receptor activation.

Cannabis users have shown decreased reactivity to dopamine, suggesting a possible link to a dampening of the reward system of the brain and an increase in negative emotionality and addiction severity.

Cannabis users can develop tolerance to the effects of THC. Tolerance to the behavioral and psychological effects of THC has been demonstrated in adolescent humans and animals. The mechanisms that create this tolerance to THC are thought to involve changes in cannabinoid receptor function.

Certain factors are considered to heighten the risk of developing cannabis dependence and longitudinal studies over a number of years have enabled researchers to track aspects of social and psychological development concurrently with cannabis use. Increasing evidence is being shown for the elevation of associated problems by the frequency and age at which cannabis is used, with young and frequent users being at most risk.

The main factors in Australia related to a heightened risk for developing problems with cannabis use include frequent use at a young age; personal maladjustment; emotional distress; poor parenting; school drop-out; affiliation with drug-using peers; moving away from home at an early age; daily cigarette smoking; and ready access to cannabis. The researchers conclude there is emerging evidence that positive experiences to early cannabis use are a significant predictor of late dependence and that genetic predisposition plays a role in the development of problematic use.

High risk groups

A number of groups have been identified as being at greater risk of developing cannabis dependence and include adolescent populations, Aboriginal and Torres Strait Islanders (in Australia) and people suffering from mental health conditions.

Adolescents

Young people are at greater risk of developing cannabis dependency because of the association between early initiation into substance use and subsequent problems such as dependence, and the risks associated with using cannabis at a developmentally vulnerable age. In addition there is evidence that cannabis use during adolescence, at a time when the brain is still developing, may have deleterious effects on neural development and later cognitive functioning.


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Diagnosis

Cannabis use Disorder is recognized in the fifth version of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), which added Cannabis withdrawal as a new condition. In the United States, the average adult who seeks treatment has consumed cannabis for over 10 years almost daily and has actively attempted to quit six or more times.


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Treatment

No medications have been found effective for cannabis dependence as of 2014, but psychotherapeutic models hold promise.

The most commonly accessed forms of treatment in Australia are 12-step programmes, physicians, rehabilitation programmes, and detox services, with inpatient and outpatient services equally accessed. In the EU approximately 20% of all primary admissions and 29% of all new drug clients in 2005, had primary cannabis problems. And in all countries that reported data between 1999-2005 the number of people seeking treatment for cannabis use increased.

Treatment options for cannabis dependence are far fewer than for opiate or alcohol dependence. Most treatment falls into the categories of psychological or psychotherapeutic, intervention, pharmacological intervention or treatment through peer support and environmental approaches. Screening and brief intervention sessions can be given in a variety of settings, particularly at doctor's surgeries, which is of importance as most cannabis users seeking help will do so from their general practitioner rather than a drug treatment service agency.

Clinicians differentiate between casual users who have difficulty with drug screens, and daily heavy users, to a chronic user who uses multiple times a day. The sedating and anxiolytic properties of THC in some users might make the use of cannabis an attempt to self-medicate personality or psychiatric disorders.

Psychological

Psychological intervention includes cognitive behavioral therapy (CBT), motivational enhancement therapy (MET), contingency management (CM), supportive-expressive psychotherapy (SEP), family and systems interventions, and twelve-step programs.

Evaluations of Marijuana Anonymous programs, modelled on the 12-step lines of Alcoholics Anonymous and Narcotics Anonymous, have shown small beneficial effects for general drug use reduction. In 2006, the Wisconsin Initiative to Promote Healthy Lifestyles implemented a program that helps primary care physicians identify and address marijuana use problems in patients.

Medication

As of 2012, there is no medication that has been proven effective for treating cannabis use disorder; research is focused on three treatment approaches: agonist substitution, antagonist, and modulation of other neurotransmitter systems. Dronabinol is an agonist that is legally available; in some cases and trials, it reduced symptoms of withdrawal and reduced cannabis use. Entacapone was well-tolerated and decreased cannabis cravings in a trial on a small number of patients. Acetylcysteine (NAC) decreased cannabis use and craving in a trial. Atomoxetine in a small study showed no significant change in cannabis use, and most patients experienced adverse events. Buspirone shows promise as a treatment for dependence; trials show it reducing cravings, irritability and depression. Divalproex in a small study was poorly tolerated and did not show a significant reduction in cannabis use among subjects.

Barriers to treatment

Research that looks at barriers to cannabis treatment frequently cites a lack of interest in treatment, lack of motivation and knowledge of treatment facilities, an overall lack of facilities, costs associated with treatment, difficulty meeting program eligibility criteria and transport difficulties. A technical report compiled by Australia's National Cannabis Centre.


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Epidemiology

Cannabis is the most commonly used illegal drug worldwide. 34.8% of Australians aged 14 years and over have used cannabis one or more times in their life. In the United States, 42% have used cannabis. In the U.S., cannabis is the most commonly identified illicit substance used by people admitted to treatment facilities. Most of these people were referred there by the criminal justice system. 16% of admittees either went on their own, or were referred by family or friends.

There is a high prevalence of cannabis use in the US. Cannabis dependence develops in 9% users, significantly less than that of heroin, cocaine, alcohol, and prescribed anxiolytics, but slightly higher than that for psilocybin, mescaline, or LSD. Of those who use cannabis daily, 10-20% develop dependence.


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Research

Columbia University, in collaboration with the National Institute on Drug Abuse (NIDA), is undertaking a clinical trial that looks at the effects of combined medication on cannabis dependency, to see if lofexidine in combination with dronabinol is superior to placebo in achieving abstinence, reducing cannabis use and reducing withdrawal in cannabis-dependent patients seeking treatment for their marijuana use. Men and women between the ages of 18-60 who met DSM-IV criteria for current marijuana dependence were enrolled in a 12-week trial that started in January 2010.

Georgotas & Zeidenberg (1979) conducted an experiment where they gave an average daily dose of 210 mg of tetrahydrocannabinol (THC), the ingredient in cannabis which is responsible for its psychological effects, to a group of volunteers over a 4-week period. After test ended, the subjects were found to be "irritable, uncooperative, resistant and at times hostile," and many of the patients experienced insomnia. These effects were likely due to withdrawal from the drug and lasted about 3 weeks after the experiment.

A 2014 Cochrane Collaboration review found insufficient data to evaluate the effectiveness of gabapentin and acetylcysteine in the treatment of cannabis dependence and that it warrants further investigation.

Source of the article : Wikipedia



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