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Table of Contents
- Introduction
- Overview of Zopiclone
- Mechanism of Action
- Chemistry
- Structural Composition
- Measurement and Analysis
- Pharmacology
- Pharmacological Profile
- Metabolism and Activity
- Physical Effects
- Sedation
- Respiratory Depression
- Muscle Relaxation
- Dizziness
- Motor Control Loss
- Gustatory Hallucination
- Visual Effects
- Shadow People
- Acuity Suppression
- Drifting
- External Hallucinations
- Tracers
- Cognitive Effects
- Amnesia
- Anxiety Suppression
- Thought Deceleration
- Disinhibition
- Delusion
- Delirium
- Analysis Suppression
- Euphoria
- Emotion Suppression
- Time Compression
- Irritability
- Increased Music Appreciation
- Compulsive Redosing
- Auditory Effects
- Auditory Hallucinations
- Toxicity and Harm Potential
- Overview
- Harm Reduction Practices
- Dependence and Abuse Potential
- Dangerous Interactions
- Legal Status
- Global Overview
Introduction
Zopiclone, known under trade names like Zimovane and Imovane, is a non-benzodiazepine hypnotic belonging to the cyclopyrrolone class. Falling within the category of "Z-drugs," alongside zaleplon (Sonata) and zolpidem (Ambien and AmbienCR), it operates via benzodiazepine-like GABA binding activity.
Usage and Concerns
Primarily prescribed for insomnia due to its potent sedative effects, Zopiclone's administration is recommended for short-term use, typically a week or less. However, concerns have arisen regarding its potential for misuse and addiction, challenging the initial belief that "Z-drugs" posed a lower risk than benzodiazepines.
Chemistry
Zopiclone is characterized by its cyclopyrrolone structure, featuring a pyrrolone core with a ketone group and various nitrogenous rings. These include a pyrazine ring, a pyridine ring, and a piperazine ring, each contributing to its pharmacological properties.
Measurement and Analysis
Analyzing Zopiclone levels in biological samples like blood, plasma, or urine is typically conducted through chromatographic methods. Therapeutic plasma concentrations are generally under 100 μg/l, although significantly higher levels have been observed in certain scenarios, such as impaired driving cases or acute poisonings.
Pharmacology
Despite structural disparities, Zopiclone shares a pharmacological profile akin to benzodiazepines. Its mechanism involves binding to GABAA receptors, acting as a full agonist, and enhancing GABA's effects, leading to sedation and anxiolysis. Additionally, it exhibits barbiturate-like properties and acts as a noncompetitive antagonist at nicotinic acetylcholine receptors, potentially causing deliriant effects.
Metabolism and Activity
Zopiclone's metabolite, desmethylzopiclone, retains pharmacological activity, primarily displaying anxiolytic properties. While zopiclone binds broadly to GABAA receptor complexes, desmethylzopiclone shows partial agonist properties, influencing neurotransmitter turnover akin to benzodiazepines.
Subjective Effects
Compared to benzodiazepines, Zopiclone often induces more pronounced amnesic and disinhibiting effects, resembling alcohol's impact. It's crucial to recognize that these effects, sourced from anecdotal reports, may not manifest uniformly and can escalate to adverse outcomes, including addiction or fatalities, particularly at higher doses.
Dosage
Zopiclone, a non-benzodiazepine hypnotic used primarily for insomnia treatment, comes with specific dosage recommendations to ensure safety and effectiveness.
Recommended Dosages
- Threshold: 2 mg
- Light: 3.5 - 5 mg
- Common: 5 - 7.5 mg
- Strong: 7.5 - 15 mg
- Heavy: 15 mg and above
Bioavailability
Understanding the bioavailability of zopiclone is crucial for determining its efficacy and potential effects on the body.
Bioavailability Rate
Zopiclone demonstrates a bioavailability rate ranging between 52% and 59%. However, precise values may vary and require further citation for confirmation.
Understanding the Physical Effects of Zopiclone
Sedation
Zopiclone induces profound sedation, plunging users into an intensely lethargic state. At higher doses, this sensation mimics severe sleep deprivation, compelling individuals to recline or lie down, feeling on the brink of passing out. This effect escalates with dosage, potentially leading to complete unconsciousness regardless of the user's activity.
Respiratory Depression
Muscle Relaxation Dizziness Motor Control Loss Zopiclone triggers significant motor control loss akin to heavy alcohol intoxication. Users may stagger and struggle to walk straight, increasing the risk of accidents. Therefore, activities like walking or stair use should be avoided while under its influence.
Gustatory Hallucination
Some users report experiencing a metallic taste in their mouths after taking zopiclone.
Visual Effects of Zopiclone
Shadow People
Acuity Suppression Drifting At strong doses or when resisting the urge to sleep, zopiclone can induce visual drifting, characterized by morphing, breathing, and flowing visuals. These effects are reminiscent of those induced by zolpidem and are more pronounced in low lighting conditions. They vary in speed, permanence, motion smoothness, appearance realism, and intricacy.
External Hallucinations
At very high doses, zopiclone may induce external hallucinations, resembling those of deliriants but less intense.
Tracers
Tracers, a mild visual effect, may be experienced at high doses of zopiclone.
Cognitive Effects of Zopiclone
Amnesia
Zopiclone can cause amnesia even at lower doses compared to benzodiazepines, leading to memory gaps during the experience.
Anxiety Suppression
Thought Deceleration Disinhibition Delusion Delirium Analysis Suppression Euphoria While some users report euphoria, it's typically short-lived and primarily occurs during the onset of the zopiclone experience.
Emotion Suppression
Zopiclone suppresses not only anxiety but also other emotions, albeit less intensely compared to antipsychotics.
Time Compression
High doses of zopiclone may induce a perception of time passing more rapidly.
Irritability
Combined with its disinhibiting effects, zopiclone may lead to irritability and potentially violent behavior towards others or oneself.
Increased Music Appreciation
Compulsive Redosing
Auditory Effects of Zopiclone
Auditory Hallucinations
At higher doses, zopiclone may induce auditory hallucinations, often in the form of voices, amplified by sleep deprivation.
Understanding Toxicity and Harm Potential of Zopiclone
Toxicity Overview
Zopiclone is generally considered to have low toxicity relative to dosage. However, its lethal potential increases significantly when combined with depressants such as benzodiazepines, alcohol, or opioids. Combining zopiclone with these substances elevates the risk of experiencing a "black-out," where the user has little to no memory of their actions while under the influence.
Harm Reduction Practices
It is strongly advised to implement harm reduction practices when using zopiclone or any other psychoactive substance. This includes conducting independent research, practicing responsible dosing, and avoiding dangerous combinations.
Dependence and Abuse Potential
Addiction Potential
Zopiclone poses a high risk of physical and psychological addiction, potentially surpassing that of benzodiazepines. Tolerance to its sedative-hypnotic effects develops rapidly with regular use, typically within a few weeks. Upon cessation, tolerance levels usually return to baseline within 7 to 14 days. Abrupt discontinuation after prolonged use may lead to withdrawal or rebound symptoms, necessitating a gradual tapering of the dosage.
Cross-Tolerance
Zopiclone induces cross-tolerance with benzodiazepines and other GABAergic depressants. This means that its consumption reduces the effectiveness of benzodiazepines and similar substances.
Dangerous Interactions
Depressants
Combining zopiclone with other depressants such as alcohol, opioids, or barbiturates can result in dangerous levels of respiratory depression. This combination intensifies muscle relaxation, sedation, and amnesia, increasing the risk of unconsciousness and respiratory failure. If unconsciousness occurs, individuals should be placed in the recovery position to prevent suffocation.
Dissociatives
The combination of zopiclone with dissociatives raises the risk of vomiting during unconsciousness, potentially leading to suffocation. Similar to depressants, individuals should be placed in the recovery position if unconsciousness occurs.
Legal Status
Global Overview
Zopiclone's legal status varies by country:
- Canada: Available by prescription only.
- Germany: Classified as a prescription medicine.
- Norway: Available by prescription.
- Switzerland: Listed as a pharmaceutical requiring a prescription.
Frequently Asked Questions (FAQ)
Q: Is Zopiclone safe to use?
A: Zopiclone is generally safe when used as prescribed for short-term insomnia treatment. However, misuse or combining it with other substances can lead to serious health risks.
Q: How quickly does tolerance to Zopiclone develop?
A: Tolerance to the sedative-hypnotic effects of Zopiclone typically develops within a few weeks of regular use.
Q: What are the risks of combining Zopiclone with other substances?
A: Combining Zopiclone with depressants like alcohol or opioids can lead to respiratory depression and increase the risk of unconsciousness. Similarly, mixing it with dissociatives raises the risk of vomiting during unconsciousness.
Q: Can Zopiclone cause addiction?
A: Yes, Zopiclone can be highly addictive both physically and psychologically. Abrupt cessation after prolonged use may result in withdrawal or rebound symptoms.
Q: What should I do if I suspect someone has overdosed on Zopiclone?
A: If someone shows signs of Zopiclone overdose, such as severe sedation or difficulty breathing, seek medical help immediately. Place the individual in the recovery position to prevent suffocation until medical assistance arrives.
Q: What is the legal status of Zopiclone in my country?
A: The legal status of Zopiclone varies by country, but it is typically available only by prescription due to its potential for misuse and addiction.
To prepare the content, the following materials were used:
- FDA Substance Registration System
- Hazardous Substances Data Bank. National Library of Medicine. 28 August 2008. Retrieved 22 August 2014. 3,4-Methylenedioxymethamphetamine
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