Opioid abuse and dependence
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Synonyms and keywords: Opioid use disorder
Opioid use disorder(OUD) is defined as a loss of control over opioid use leading to physical, psychological, and social consequences. With chronic use for treatment of pain, dependence may lead to substance abuse and "aberrant medication-taking behaviors" may occur. From 2000-2005, the abuse of prescribed opiods, especially oxycodone extended release (OxyContin) and hydrocodone, has increased.
Opioid Use Disorder
Opioid use disorder(OUD) is defined as a loss of control over opioid use leading to physical, psychological, and social consequences. The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) includes diagnostic criteria for OUD that are universal across all drugs and are based on the presence of at least two of 11 criteria organized into four clusters: 1-Impaired control 2-Social impairment 3- Risky use 4- Pharmacologic dependence Opioid abuse happens for different of reasons, including self-medication, use for reward, compulsive use due to addiction, and diversion for profit. treatment methods that balance chronic pain while reducing the risks for drug abuse, misuse, and distraction are strongly needed.
Tolerance is the process whereby neuroadaptation occurs (through receptor desensitization) resulting in reduced drug effects. Tolerance is more pronounced for some effects than for others - tolerance occurs quickly to the effects on mood, itching, urinary retention, and respiratory depression, but occurs more slowly to the analgesia and other physical side effects. Impaired control leads to the use in bigger amounts or for longer periods of time than anticipated; persistent desire to reduce or stop use; many unsuccessful attempts to reduce or stop use; a significant amount of time spent using or recovering from the effects of the substance; a strong urge to use or crave the substance.
Magnesium and zinc deficiency speed up the development of tolerance to opioids and relative deficiency of these minerals is quite common due to low magnesium/zinc content in food and use of substances which deplete them including diuretics (such as alcohol, caffeine/theophylline) and smoking. Reducing intake of these substances and taking zinc/magnesium supplements may slow the development of tolerance to opiates.
Dependence is characterized by extremely unpleasant withdrawal symptoms that occur if opioid use is abruptly discontinued after tolerance has developed. The withdrawal symptoms include severe dysphoria, sweating, nausea, rhinorrhea, depression, severe fatigue, vomiting and pain. Slowly reducing the intake of opioids over days and weeks will reduce or eliminate the withdrawal symptoms. The speed and severity of withdrawal depend on the half-life of the opioid — heroin and morphine withdrawal occur more quickly and are more severe than methadone withdrawal, but methadone withdrawal takes longer. The acute withdrawal phase is often followed by a protracted phase of depression and insomnia that can last for months. The symptoms of opioid withdrawal can also be treated with other medications, but with low efficacy.
Addiction is the process whereby physical and/or psychological addiction develops to a drug - including opioids. The withdrawal symptoms can reinforce the addiction, driving the user to continue taking the drug. Psychological addiction is more common in people taking opioids recreationally, it is rare in patients taking opioids for pain relief.
Drug abuse is the misuse of drugs producing negative consequences.
- Depressive disorder
- Alcohol intoxication
- Sedative, hypnotic,or anxiolytic intoxication
- Sedative-hypnotic withdrawal
- Hallucinogen intoxication
- Stimulant intoxication
Epidemiology and Demographics
The 12 month prevalence of opioid use disorder is 370 per 100,000 (0.37%) in ages 18 years and older in the community population. In 2016, an estimated 26.8 million persons worldwide with OUD, up 47.3 percent from 1990. The highest prevalence was found in high-income North America, North Africa, and the Middle East.
Variability in opioid prescribing in emergency departments is a risk factor. The Centers for Disease Control and Prevention has studied risk factors. Substance use disorders are linked to psychiatric problems; those who have one are more likely to have the other. Substance use causing mental diseases, people with psychiatric disorders using substances to manage symptoms, and common risk factors for both conditions are all possible explanations. The lifetime prevalence of comorbid psychiatric disorders in patients with OUD has been found to range between 24 and 86 percent, with mood and anxiety disorders being the most common axis I disorders and antisocial personality disorder being the most commonly diagnosed axis II condition. Determining whether a person has a substance-induced disorder or a basic psychiatric disorder can be difficult in people with co-occurring disorders.
DSM-V Diagnostic Criteria for Opioid Use Disorder(OUD)
Note: This criterion is not considered to be met for those taking opioids solely under appropriate medical supervision.
Note: This criterion is not considered to be met for those individuals taking opioids solely under appropriate medical supervision .
Screening for OUD
There are several ways to test for unhealthy drug abuse. one of the simplest is to ask two questions:
- 1. In the last 12 months, how many days have you used drugs other than alcohol? ( a score of seven or more considered as positive)
- 2. In the last 12 months, how many days have you used medicines more than you intended? (it is positive if two or more are positive)
- Psychosocial treatment
several methods of psychosocial interventions such as individual counseling or group therapy can benefit people with OUD. Clinicians in primary care can assist patients who are interested in these treatments in getting connected to them. there is limited evidence to recommend these kinds of interventions either alone or in combination with pharmacotherapy. Most of the surveys on these therapeutic interventions are used in conjunction with medication.
long-term(maintenance) medication is still the first-line treatment for patients with OUD, and many patients prefer it. the evidence for the three medications that have been approved for the treatment of OUD- Methadone, Buprenorphine, Naltrexone- will be discussed in the following section. long-term maintenance therapy with agonists is the mainstay treatment for OUD. a systematic review of 19 cohort studies in 2017 showed that pharmacotherapy with methadone and buprenorphine significantly reduces mortality for all reasons in the patients using opioid agonist comparing to the people without medical treatment.
Buprenorphine is a highly effective long-acting partial opioid agonist for the treatment of OUD. Buprenorphine is available in different formulations in the USA. Most of them are combined with naloxone to avoid injection or intranasal use. sublingual tablets are available in 2, and 8 mg doses with or without naloxone. many patients may need doses above 16mg/day up to 32 mg. for those who do not respond to 32mg/day of buprenorphine, methadone therapy should be considered. long term maintenance treatment with buprenorphine is more effective than short-term or medically supervised withdrawal treatment. Buprenorphine has a high tendency to bind to the receptor, which adds to its safety. however it can dislodge other narcotics and lead to unwanted withdrawal if given too soon after using an agonist. to prevent this buprenorphine should be started when withdrawal symptoms begin in the patient. usually, after 8 to 12 hours of using short-acting opioids such as heroin, buprenorphine can be started with a low dose.
Methadone is a highly effective long-acting agonist, which noticeably reduces the use of illicit opioid use.. considering that methadone has a long half-life, the starting dose is at 30-40 mg/day and increases slowly until an effective therapeutic dose is reached. The goal and effective dose are to suppress opioid craving and at the same time to avoid over-sedation. The studies show that higher doses of methadone( doses of at least 60-100 mg) are linked with maintaining treatment and reduction of overdose mortality.
Naltrexone is an opium antagonist, the newest medication for the treatment of OUD in primary care settings. The oral form has low efficacy. However, RCT studies have shown that the monthly injection of the intramuscular extended-release formulation is superior to the placebo and the oral form of naltrexone and reduces craving and relapse in patients with OUD.
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