Imovane

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Imovane

Method of action: Hypnotic

Treatment option: Insomnia

Medically reviewed

Laura Arias

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Imovane

Quick Facts

Attribute Detail
Active Ingredient Zopiclone
Drug Class Non-benzodiazepine sedative-hypnotic (a 'Z-drug')
Primary Use Short-term treatment of insomnia in adults
Mechanism Enhances the inhibitory effects of GABA in the brain

Imovane is the brand name for the medication containing the active ingredient zopiclone. It belongs to a class of medications known as non-benzodiazepine hypnotics, often referred to as 'Z-drugs'. This drug is prescribed for the short-term treatment of insomnia in adults, typically for a duration of 7 to 14 days, as long-term use is not recommended due to risks of dependence and tolerance.

Zopiclone works by interacting with the central nervous system to promote sleep. Its mechanism of action involves binding to the GABAA (gamma-aminobutyric acid type A) receptor complex, which is the primary inhibitory neurotransmitter system in the brain. By enhancing the activity of GABA, Imovane produces a calming and sedative effect that helps to decrease the time it takes to fall asleep and reduces nighttime awakenings.

It is important to note that the use of Imovane should be considered only when insomnia is severe, debilitating, or causing extreme distress. As with all hypnotic agents, treatment should be for the shortest possible period.

What side effects are possible with Imovane?

The safety profile of Imovane (zopiclone) is structured according to regulatory classifications of side effect frequency and their classification by System-Organ-Class. The most Common adverse reactions, occurring in more than 1 in 100 people, include a characteristic bitter or metallic taste (dysgeusia), residual drowsiness (somnolence), and dry mouth. Uncommon effects include headache, dizziness, nausea, and vomiting.

Serious Adverse Reactions and Safety Constraints

Certain reactions, documented as rare or having an unknown frequency, are considered clinically significant. These include complex sleep behaviours such as sleep-walking or sleep-driving, which are associated with subsequent amnesia for the event. Anaphylactic reactions and angioedema (severe allergic swelling) are documented as Very Rare. The potential for developing physical and psychological dependence and a resulting withdrawal syndrome upon abrupt cessation is explicitly noted, with the risk increasing with the dose and duration of treatment beyond four weeks.

Population-Specific Safety Considerations

The drug is contraindicated in individuals with severe hepatic insufficiency, severe respiratory failure, or Myasthenia Gravis. For older adults, the official label notes an increased sensitivity to the psychomotor effects, which heightens the risk of falls and fractures. Additionally, the risk of anterograde amnesia is tied to administration, with 7 to 8 hours of uninterrupted sleep being recommended to mitigate this effect. The safety and efficacy of zopiclone are not established for the pediatric population (under 18 years).

Overdose and Emergency Response

Overdose Manifestations and Severe Outcomes

Overdose of Imovane (zopiclone) primarily results in an exaggeration of its core pharmacological effect, leading to progressive Central Nervous System (CNS) depression. Documented clinical manifestations of overdose range from symptoms of somnolence (profound drowsiness), confusion, and lethargy, to severe states involving ataxia (loss of coordination), hypotonia (loss of muscle tone), hypotension (low blood pressure), and ultimately coma.

The regulatory profile highlights that overdose may become life-threatening due to potential respiratory depression and cardiovascular compromise. The risk of a fatal outcome is significantly increased when zopiclone is ingested in combination with other CNS depressants, such as alcohol or opioids.

When to Seek Urgent Medical Help

Immediate medical attention is mandatory for any suspected overdose. Regulatory documents explicitly state that individuals must seek a doctor or go to the emergency department straight away, or contact a regional Poison Control Centre for guidance. Management is symptomatic and supportive, requiring careful monitoring of vital signs, especially respiratory and cardiovascular function. A specific antidote (flumazenil) may be considered in severe cases, though its use is complex. Procedures like haemodialysis are officially documented as being of no value in treating zopiclone overdose. Overdose symptoms may be more prolonged in the elderly or in patients with pre-existing hepatic or respiratory conditions.

Therapeutic Uses of Imovane

Quick Facts

  • Addresses: Short-term insomnia
  • Helps with: Difficulty falling asleep (sleep onset)
  • Supports: Maintenance of sleep (staying asleep)

Imovane (zopiclone) is a prescription medication used for the short-term management of insomnia in adults. It is typically considered for use when difficulties with sleep are prominent and result in impaired daytime functioning.

The drug is an option for individuals who experience:

  • Challenges with sleep initiation (difficulty falling asleep).
  • Nocturnal awakenings (waking up during the night).
  • Early morning awakenings.

Treatment duration is generally intended to be brief, often not exceeding seven to ten consecutive days. Zopiclone may help to reduce the time required to fall asleep and may support improved sleep duration. It is important to note that this medication does not address the underlying causes of disturbed sleep.

Regulatory References

  1. Health Canada's Drug and Health Product Register

Eligibility and Restrictions for Use

Eligibility for Zopiclone (Imovane) Use

Official regulatory bodies define the eligibility for Zopiclone use based on age, specific comorbid conditions, and physiological states. The medicine is indicated solely for the adult population for short-term treatment only.

Populations for Whom Use is Contraindicated

Use of Zopiclone is strictly prohibited in several patient groups, including individuals with:

  • Severe Hepatic Insufficiency (severe liver impairment)
  • Myasthenia Gravis (severe muscle weakness)
  • Severe Respiratory Failure or Severe Sleep Apnoea Syndrome
  • Known hypersensitivity to the drug
  • Children and Adolescents under 18 years of age (safety and efficacy are not established)
  • History of complex sleep behaviors with similar hypnotic drugs

Populations Requiring Conditional or Restricted Use

Eligibility is conditional for certain populations, requiring a lower starting dose as mandated by regulators:

  • Older Adults (geriatric patients)
  • Patients with Renal or Hepatic Impairment (mild to moderate)
  • Individuals with Chronic Respiratory Insufficiency

Use requires extreme caution in patients with a documented history of alcohol or drug abuse. Furthermore, the use of Zopiclone is generally not recommended during pregnancy and must be avoided by breastfeeding mothers.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Imovane (zopiclone) can interact with several substances, primarily by increasing their sedative effects on the central nervous system (CNS) or by altering its metabolism in the body.

Serious Interactions:

  • CNS Depressants and Opioids: Co-administration with opioid medicines, other sedative/hypnotic drugs, or alcohol can lead to profoundly increased sedation, severe respiratory depression, coma, and even death. Due to these risks, concomitant use with opioids should be reserved for cases where alternative treatment options are not adequate.
  • Alcohol: Consumption of alcohol is strongly advised against, as it significantly enhances the sedative and psychomotor-impairing effects of Imovane, increasing the risk of adverse events like complex sleep behaviors (e.g., sleep-driving) and difficulty waking.

Other Interactions:

  • CYP3A4 and CYP2E1 Modifiers: Zopiclone is metabolized by certain liver enzymes (CYP3A4 and CYP2E1). Medicines that inhibit these enzymes, such as certain antibiotics (e.g., erythromycin, clarithromycin) and antifungals (e.g., ketoconazole, itraconazole), can increase the concentration of Imovane in the blood, potentially enhancing its sedative effects. Conversely, medicines that induce these enzymes (e.g., rifampicin, St. John's Wort) can decrease Imovane's blood levels and reduce its effectiveness.

Timing and Risk:

  • The risk of next-day psychomotor impairment is increased if the drug is taken with other CNS depressants or if less than 12 hours are available for sleep before activities requiring mental alertness, such as driving.

Mechanism of Action

Imovane (zopiclone) is a cyclopyrrolone agent that primarily modulates inhibitory neurotransmission in the central nervous system. Its biological target is the GABA A receptor complex, where it functions as a positive allosteric modulator. It interacts with the benzodiazepine binding site, which is located at the interface of the alpha and gamma subunits of the receptor pentamer. This binding event does not activate the receptor directly but modifies the receptor's conformation, increasing the affinity of the endogenous neurotransmitter gamma-aminobutyric acid (GABA) for its own binding sites.

The subsequent consequence of this allosteric potentiation is an increased frequency of chloride ion channel opening. The resulting augmented influx of negatively charged chloride ions ( Cl^-) across the neuronal membrane causes hyperpolarization of the neuron. This hyperpolarization decreases the excitability of the post-synaptic neuron, leading to a generalized reduction in neuronal firing rates across various brain circuits. This system-level physiological consequence manifests as central nervous system depression.

Dosage and Administration Information

How Imovane is Used

Imovane (zopiclone) is administered via the oral route using film-coated tablets, which are available in strengths of 3.75 mg and 7.5 mg. The established standard dose for adults is 7.5 mg, taken as a single administration once daily. The tablet must be swallowed whole with water and is not to be crushed or chewed. Administration must occur immediately before retiring for the night, and never as a repeated dose during the same night.

The drug should only be taken when a minimum of 7 to 8 hours of uninterrupted sleep is possible. Treatment duration is limited to the shortest possible time, generally not exceeding four weeks, which includes the necessary time for gradual dose reduction (tapering). Extended use requires re-evaluation of the patient's condition.

Dosing regimens include required reductions for specific populations. An initial dose of 3.75 mg nightly is specified for older adults, as well as for patients with documented hepatic or renal impairment, or chronic respiratory insufficiency. Zopiclone use is not authorized for individuals under 18 years of age. Discontinuation after any period of treatment requires a gradual dose reduction process rather than an abrupt cessation.

Recent Clinical Evidence

Research evidence / Overview of Studies for Imovane (Zopiclone)


Evidence from Short-Term Controlled Trials for Insomnia

Much of the research evidence for zopiclone has been gathered through trials assessing short-term or episodic sleep patterns. Research explored the effects of the compound by comparing it to an inactive pill (placebo) over defined, brief time intervals, typically ranging from a few days up to four weeks. These investigations utilized methods such as sleep diaries and physiological monitoring to assess outcomes related to episodic or acute changes in sleep.

Findings indicate patterns related to several measured sleep metrics. For instance, studies report observations regarding the time it took participants to fall asleep and the frequency of nighttime awakenings, comparing these measurements against the placebo group. It is important to remember that this research only describes group patterns observed over limited durations, not personal outcomes or long-term effects.

Long-Term Evidence and Follow-up Duration

Most research exploring short-term symptom changes has follow-up durations that were limited, with studies typically monitoring responses over defined time intervals that did not exceed four weeks. For this reason, long-term effects are not fully established. While research highlights changes measured during these short study periods, there is limited information for long-term outcomes regarding the durability of these findings.

Data are still emerging, but certainty remains low regarding what happens after several months or years of continued use. The evidence reflects the drug's intended, brief duration of use.

Studies in Special Populations

Research examined the effects of zopiclone in older adults. Studies examined how symptoms are measured in this population, and findings indicate patterns related to measured sleep parameters. Data for certain groups, including children or pregnant populations, remain insufficient, and the results apply only to the populations specifically studied.

Context of Evidence Quality and Comparison

Evidence quality varies across studies due to differences in research methods and modest sample sizes in many early trials. Research has also sought to compare zopiclone against other treatments for insomnia, including the older benzodiazepine class of drugs and other newer sedative-hypnotics.

While data show patterns related to short-term differences in measured sleep parameters compared to placebo, the findings were mixed or inconsistent across different trials when comparing zopiclone to other active sedative-hypnotic treatments. The study results reflect the specific conditions under which they were conducted.

What Scientific Uncertainty Remains

There is limited information for long-term outcomes, and certainty remains low regarding the full profile of extended use. Evidence is limited or entirely lacking in several patient groups, and the full range of results in these specific groups have not been fully established.

Key Studies & References

  1. Newer hypnotic drugs for the short-term management of insomnia: a systematic review and economic evaluation (NICE TA77 Assessment Report)
  2. Eszopiclone versus zopiclone in the treatment of insomnia | Clinics (RCT)
  3. Orexin dual receptor antagonists, zolpidem, zopiclone, eszopiclone, and cognitive research: A comprehensive dose-response meta-analysis
  4. PRODUCT MONOGRAPH IMOVANE (zopiclone) Tablets (Health Canada Regulatory Document)

Frequently Asked Questions (FAQ)

Common questions about Imovane (FAQ)

Q: How quickly does Imovane usually start to work after it is taken?

Imovane is rapidly absorbed into the system after it is taken orally. Regulatory documents note that peak concentrations of the active ingredient are usually reached within 1.5 to 2 hours. Patient information often suggests that the medicine generally begins to work within approximately one hour.


Q: What is the typical duration of the effects of Imovane?

The duration of the drug's effects is related to its elimination half-life, which is approximately five hours in healthy adults. This period describes the time it takes for the concentration of the active ingredient to reduce by half in the body. In older adults, the elimination half-life may be extended to around seven hours.


Q: Is Imovane considered to be a controlled substance?

Yes, official regulatory bodies in several countries, including Canada and the US, classify zopiclone (the active ingredient in Imovane) as a Schedule IV controlled substance. This scheduling is based on the potential for misuse, dependence, and withdrawal. This classification indicates a low potential for abuse relative to Schedule III substances.


Q: Is it safe to use Imovane with common anxiety or depression medications? (Informational)

Official product information indicates caution when taking Imovane with medicines for depression or anxiety, as combining these substances may increase the sedative effect and the risk of drowsiness. This information does not constitute medical advice, and guidance on specific combinations is provided by a treating healthcare professional.


Q: What is the difference between Imovane and other 'Z-drugs' like zolpidem? (High-level explanation)

Imovane belongs to the 'Z-drug' class, as does zolpidem, but they come from different chemical families (cyclopyrrolone versus imidazopyridine). Both medications enhance the effects of gamma-aminobutyric acid (GABA), which is the brain's main chemical messenger for calming activity. They are described as binding to slightly distinct sites on the GABA receptor complex.


Q: What is rebound insomnia, and is it common after stopping Imovane?

Rebound insomnia is described in regulatory warnings as a potential temporary worsening of sleep difficulties when the drug is stopped. The risk of this phenomenon is noted to increase after prolonged treatment. To minimize this effect, official guidelines describe the importance of gradual dose reduction, rather than abrupt cessation, after any period of treatment.


Q: Can taking Imovane be associated with vivid or unusual dreams?

While vivid or unusual dreams are not explicitly listed as a common side effect in official documents, rare or serious adverse reactions include mental changes such as visual or auditory hallucinations. Any unusual mental or behavioral changes reported during treatment are evaluated by a healthcare professional.


Q: Is it necessary to avoid certain foods when taking Imovane?

Regulatory studies indicate that the rate of Imovane’s absorption is generally not altered by the presence of food. Therefore, specific food avoidance is not typically required. However, official warnings consistently state that the consumption of alcohol while using this medicine is strongly discouraged.


Q: What kind of mental health history (e.g., depression) is described as a concern when using Imovane?

Official product information advises that caution is necessary when Imovane is used in patients with known signs of depression. Regulatory documents state that hypnotic drugs carry a risk of intensifying existing depressive symptoms. Due to safety concerns regarding self-harm, regulatory guidance addresses the need to limit the quantity of the drug prescribed in these instances.


Q: Does Imovane affect blood pressure or heart rate, based on research?

Imovane is not typically associated with significant routine changes in blood pressure or heart rate as a common side effect. However, regulatory warnings about overdosage state that symptoms can include low blood pressure (hypotension), which may cause feelings of dizziness or faintness.


Q: What steps should be followed if a user misses a dose of Imovane?

Regulatory guidance is explicit: if a dose is forgotten by bedtime, it must be skipped completely. It is important never to take two doses at the same time or to take a dose again during the same night. The next dose should be taken at the usual time the following night.


Q: What does the evidence indicate about Imovane's effect on sleep architecture (e.g., REM sleep)?

Studies examined the drug's effect on sleep architecture, which is the pattern of sleep stages. Official data indicates that Imovane generally preserves or prolongs the deep sleep stages (NREM Stages III and IV). The drug is also shown to preserve paradoxical sleep, which is also known as REM sleep.


Q: How is the risk of overdose described in regulatory documents for Imovane?

Official regulatory documents describe the risk of overdose as serious. Taking more than the amount prescribed can lead to symptoms such as excessive drowsiness, confusion, shallow or reduced breathing, and low blood pressure, which could progress to coma. Immediate medical attention is necessary if an overdose is suspected.


Q: Is Imovane used to help people with difficulty falling asleep, staying asleep, or both?

According to official regulatory documents, Imovane is intended for the short-term management of insomnia that involves difficulty with both falling asleep (sleep initiation) and frequent awakenings during the night (sleep maintenance). Studies examining the drug report effects on both of these measures.


Q: Is it required to take Imovane every night, or can it be used only as needed?

Imovane is generally prescribed for short-term consecutive use for the shortest possible duration. However, in some contexts, a healthcare professional may advise patients to use the medicine on a non-consecutive or as-needed (PRN) basis for a few nights per week. The pattern of use is based on the individual's specific circumstances.


Q: What is the significance of the bitter taste side effect mentioned in product labeling?

A characteristic bitter or metallic taste in the mouth, known as dysgeusia, is described in official product labeling as a very common side effect. Studies suggest this effect is related to the drug’s systemic levels and its presence in the saliva. While typically not serious, patients should know this is a widely reported expectation of using Imovane.

How should Imovane be stored and disposed of?

How to Store and Dispose of Imovane (Zopiclone)

Imovane must be stored under specific conditions to maintain stability and prevent misuse, as defined by regulatory agencies.

Storage Requirements

Condition Requirement
Temperature Store below 30 C or below 25 C.
Protection Keep away from moisture, heat, and direct sunlight.
Container Maintain the tablets in their original blister pack.
Security Store securely, out of the sight and reach of children.

Disposal Instructions

Unused or expired Imovane must be disposed of in accordance with local requirements. Do not dispose of the medication via wastewater or household waste unless local regulations specifically permit it. Consult a pharmacist or local waste management system for guidance on disposal programs.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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