Zop

Quick links to important sections

Zop

Treatment option:

Medically reviewed

Marina Burgos

Last updated on 10/01/2026

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 Zop

Quick Facts

Property Description
Active Ingredient Eszopiclone or Zopiclone
Form Tablet (for oral route use)
Pharmacological Class Sedative-hypnotic (Z-drug)
General Purpose Addressing difficulties with insomnia
Origin Synthetic (cyclopyrrolone derivative)

The Identity of Zop: A Sedative-Hypnotic Z-Drug

Zop, referencing the substances Eszopiclone and Zopiclone, is defined as a synthetic, prescription-only medicinal agent classified primarily as a sedative-hypnotic drug. Its general purpose is clinically recognized for addressing difficulties associated with insomnia, helping to facilitate the initiation and maintenance of sleep. This compound belongs to the nonbenzodiazepine hypnotic group, commonly referred to as Z-drugs, which operate by modulating activity within the central nervous system (CNS). Eszopiclone is structurally distinct from traditional benzodiazepines, yet it functions similarly by targeting the GABA receptor complex. This identifies the drug’s role as a targeted agent for sleep promotion. As a cyclopyrrolone derivative, the medication supports the brain in achieving the necessary state of reduced excitation required for a stable sleep pattern, differentiating its chemical profile from other sleep aids.

Composition and Form: Eszopiclone and Zopiclone

The active ingredients in the medicinal entity Zop are either Eszopiclone or Zopiclone, with the product delivered as a single-ingredient product. Eszopiclone is the pure, isolated S-stereoisomer of Zopiclone, representing the specific component responsible for the desired pharmacological effect. The identification of Eszopiclone as the active S-isomer is a defining characteristic of its chemical profile. Both substances are synthetic pyrrolopyrazine derivatives. The medication is typically manufactured as film-coated tablets suitable for oral administration, ensuring efficient delivery of the active ingredient into the body. This specific formulation and delivery method confirm its positioning as a solution for patients experiencing short-term sleep disturbances.

What side effects are possible with Zop?

Possible Side Effects and Safety Information

The safety profile for Zop, referencing Eszopiclone and Zopiclone, is defined by regulatory documents that classify potential adverse effects based on frequency and affected body system. As a sedative-hypnotic, effects primarily involve the Nervous System and Psychiatric Disorders.

Officially documented adverse reactions are categorized as follows:


Classification Examples of Adverse Reactions
Very Common Unpleasant taste (dysgeusia) (Eszopiclone)
Common Dizziness, headache, somnolence, dry mouth, nausea, fatigue
Uncommon Hallucinations, amnesia, agitation, rash
Rare Angioedema, anaphylactic reaction

Serious Adverse Reactions and Safety Constraints

Official labeling documents specific, serious adverse reactions. These include complex sleep behaviors (e.g., sleep-driving or preparing food while not fully awake) which can lead to serious injury. Severe hypersensitivity reactions like anaphylaxis and angioedema are also documented and require immediate attention. The medicine is formally contraindicated in patients who have previously experienced complex sleep behaviors while using it.

Safety notes specify that the risk of dependence and rebound insomnia upon abrupt cessation increases with the duration of use, particularly beyond four weeks. Older adults are subject to specific considerations due to an increased risk of CNS effects like dizziness, which elevates the potential for falls. Furthermore, patients with severe hepatic impairment face stricter usage limitations or contraindication, as the drug's exposure is increased in this population.

Overdose and Emergency Response

Overdose with products containing Eszopiclone or Zopiclone (Zop) primarily presents as an extreme extension of the drug's pharmacological properties, resulting in Central Nervous System (CNS) depression. Regulator-mandated guidance requires individuals to seek immediate medical attention and contact emergency services immediately upon suspicion of overdose.

Documented clinical manifestations range from severe somnolence, lethargy, ataxia, and confusion to profound coma. Severe, life-threatening outcomes officially listed in regulatory documents include respiratory depression and hypotension. The risk of a fatal outcome is significantly increased if the overdose involves co-ingestion with other CNS depressants, notably alcohol.

Management is strictly symptomatic and supportive, focusing on maintaining vital functions. Procedures described in official labeling include ensuring a patent airway and continuous cardiovascular monitoring. The use of the antagonist flumazenil may be considered, though it is officially noted that its use carries a risk, such as the potential for seizures.

Overdose severity is officially stated to be more pronounced in the elderly and patients with underlying hepatic, renal, or respiratory impairment. These populations require particularly vigilant clinical observation.

Therapeutic Uses of Zop

What Zop Treats: Main Uses and Benefits

Zop, referencing Eszopiclone and Zopiclone, is commonly used for short-term and long-term symptomatic support in managing insomnia. The core therapeutic goal is to address specific patterns of sleep disruption to restore functional stability and improve comfort during waking hours. The medication is utilized for the treatment of insomnia to support the management of symptoms that interfere with rest periods.

The medication is relevant for easing challenging symptoms related to difficulty initiating sleep, frequent nocturnal awakenings, and waking up too early. This approach is applied in clinical settings that involve acute or unstable symptom patterns, supporting patients during difficult episodes by easing distress. The medication is considered relevant across conditions involving episodic or fluctuating manifestations, supporting patients during both short-term periods and longer-term challenges.

Quick Fact: Relief for Sleep Symptoms

This support is primarily used to address conditions involving episodic or fluctuating manifestations, helping to manage symptom clusters that may become intense or disruptive. The medication helps to ease the overall symptomatic burden and assists with maintaining functional stability, contributing to improved comfort during symptomatic periods.

Regulatory References

  1. Eszopiclone Official FDA Labeling

Eligibility and Restrictions for Use

This section outlines official population eligibility and exclusion rules for Zop (Eszopiclone/Zopiclone), as documented in regulatory labeling.

Contraindicated Populations

Use is prohibited for patients with known hypersensitivity to the medicine or its ingredients, a prior episode of complex sleep behaviors (e.g., sleepwalking) after taking a Z-drug, severe hepatic insufficiency (Zopiclone), myasthenia gravis, or severe sleep apnoea syndrome [FDA/EMA documentation].


Age- and Condition-Based Restrictions

Population Group Regulatory Status
Children/Adolescents (<18) Contraindicated or Safety not established [HPRA/FDA].
Older Adults (Geriatric) Eligible, but restricted to lower initial doses due to increased sensitivity [FDA/HPRA].
Severe Organ Impairment Contraindicated (e.g., severe hepatic/respiratory failure). Moderate impairment requires a reduced starting dose [HPRA/FDA].
Pregnancy/Lactation Not recommended (Zopiclone in lactation). Use is classified such that it must be considered only if benefit outweighs risk (Eszopiclone) [HPRA/FDA].

Official Eligibility Status: Zop is approved for use in adults (18 years and older). Caution is required for individuals with a history of alcohol or drug abuse or symptoms of depression, often limiting the quantity supplied.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Zopiclone interacts with other substances primarily through two mechanisms: increasing the central nervous system (CNS) depressant effect and altering its metabolism via liver enzymes. It is crucial to understand these interactions before use.


Pharmacodynamic (Additive) Interactions

Concomitant use with alcohol is strongly discouraged as it significantly increases the sedative effects, risk of respiratory depression, and danger of complex sleep behaviors (e.g., sleep-driving). The combination with other CNS depressants—such as opioids (e.g., strong pain medicines), anxiolytics, sedating antihistamines, or other sleep aids—requires extreme caution. This combination leads to additive drowsiness and impaired mental alertness, with the potential for severe respiratory depression, coma, and death when taken with opioids. If this combination is necessary, patients must be closely monitored.


Pharmacokinetic (Metabolic) Interactions

Zopiclone is broken down mainly by the CYP3A4 enzyme in the liver. Medicines that inhibit (slow down) this enzyme, such as potent antifungals (e.g., ketoconazole) or certain antibiotics (e.g., erythromycin), can increase the concentration of Zopiclone in the blood, leading to enhanced effects like increased sedation. Conversely, strong enzyme inducers (speed up), such as Rifampicin, can reduce Zopiclone's concentration, potentially diminishing its effectiveness.

Mechanism of Action

Mechanism of Action: Modulating CNS Inhibition

Zop functions as a positive allosteric modulator of the gamma-aminobutyric acid type A ( GABAA) receptor complex, the primary mediator of inhibitory neurotransmission in the central nervous system (CNS). Zop selectively targets a specific allosteric site on the omega1 (alpha1) subunit of this receptor.

Binding at this site enhances the effect of the body's endogenous neurotransmitter, GABA, leading to a molecular cascade. This cascade increases the frequency of the receptor's central chloride ion channel opening. The resultant rapid influx of negatively charged chloride ions ( Cl^-) causes neuronal hyperpolarization—the inner cell becomes more negatively charged, increasing the threshold for action potential generation. This systemic dampening of neuronal excitability primarily affects brain circuits regulating arousal and wakefulness. The physiological consequence is a reduction in the time required for the onset of central nervous system depression and sustained inhibition of neuronal firing, facilitating states of decreased arousal.

Dosage and Administration Information

How to use Zop — Official Administration Guidelines

The usage of Zop (Eszopiclone and Zopiclone) is governed by specific instructions established in clinical guidelines.


Administration Scope

Instruction Category Official Guideline (Eszopiclone & Zopiclone)
Route of administration Oral route only; the medicine is provided as a tablet.
Dosing schedule (Adults) Eszopiclone max dose is 3 mg once daily. Zopiclone standard dose is 7.5 mg once daily.
Timing in relation to meals Eszopiclone should not be taken with or immediately after a heavy, high-fat meal as this can slow absorption.
Preparation requirements The tablet must be swallowed whole and should not be crushed or chewed.
Age-group administration rules The total daily dose for Eszopiclone should not exceed 2 mg in elderly or debilitated patients. Zopiclone has a recommended starting dose of 3.75 mg for the elderly.
Missed-dose rules The medicine must not be re-administered during the same night. Doses should be taken only when a full night's sleep is possible.
Special procedural conditions The user must ensure at least 7 to 8 hours of sleep time remains after administration.

Instruction Classifications (High-Level)

Classification Description
Administration method type Oral
Frequency pattern Once daily
Protocol basis Established clinical guidelines
Use-context constraints Time-of-day specific (immediately before bed), Duration limited (Zopiclone should not exceed four weeks total).

Resulting Procedural Structure

Official step sequence:

  • Take a single dose immediately before retiring, with at least 7 to 8 hours available for sleep.
  • Swallow the tablet whole, ensuring avoidance of heavy, high-fat meals if taking Eszopiclone.
  • Adhere to the specified maximum dose for the active ingredient, adjusting downwards for sensitive populations like the elderly or those with hepatic impairment.

Connection to the overall use protocol: The official instructions define a standardized protocol that requires a single, time-critical oral intake and imposes specific dose limitations based on the active ingredient and patient-specific factors. This framework ensures the medicine is used strictly within the limits established by clinical protocols.

Recent Clinical Evidence

Research Evidence / Overview of studies for Zop

Evidence for Use in Insomnia

The official research base for Zop, which includes both Eszopiclone and Zopiclone, primarily consists of Randomized Controlled Trials (RCTs). These short-term studies and combined meta-analyses are relevant in trials assessing episodic symptom patterns related to difficulties falling asleep and maintaining sleep throughout the night. Research has explored the medicine by observing adults with chronic insomnia for periods generally ranging from a few weeks up to six months in specific long-term trials. These studies monitored patient-reported outcomes describing perceived discomfort and also used objective measurements, such as those taken during Polysomnography (PSG), to track how symptoms evolved in the observed populations.

Research examined outcomes related to physical discomfort and systemic imbalance by focusing on three main areas: the time taken to fall asleep, the total time spent asleep, and the time spent awake after initially falling asleep. Data show patterns related to these outcomes when compared to participants who received a placebo. The degree of change observed in sleep time measurements contributes to the assessment of these findings.

Evidence in Comorbid and Specialized Populations

Zop was also studied for use in specific populations where insomnia co-exists with other conditions. This research was evaluated in cohorts of patients with conditions characterized by functional limitations, such as insomnia linked to Major Depressive Disorder (MDD), Generalized Anxiety Disorder (GAD), or conditions involving periods of heightened symptoms such as Perimenopause/Postmenopause.

Extended Use and Long-Term Follow-up Data

Studies explored the effects of Zop over defined time intervals, with the majority of high-quality, placebo-controlled evidence collected over short periods. Research describes that the longest formal controlled trials for Eszopiclone extended up to six months of observation in adult populations with chronic insomnia. However, findings for long-term use are not fully established. The evidence quality varies across studies, and long-term effects beyond six months are not fully established through rigorous, comparative RCTs.

Research Gaps and Areas of Uncertainty

A key limitation of the research is that results apply only to the specific populations studied, and follow-up durations were limited in the majority of regulatory-supporting trials. There is limited information for long-term outcomes, particularly for many of the comorbid and specialized groups. The evidence highlights areas that have been studied and areas that are still uncertain.

Key Studies & References

  1. A Study of Eszopiclone in Subjects With Insomnia Related to Major Depressive Disorder (Trial NCT00368030)

Frequently Asked Questions (FAQ)

Common questions about Zop (FAQ)


Q: How quickly does Zop typically start working?

A: Official information indicates that Zop (Eszopiclone) is generally rapidly absorbed into the bloodstream, with the highest concentration typically reached within about 1 to 1.6 hours after taking the tablet. Due to its quick action, it is directed to be taken only immediately before bedtime.

Q: What is the usual duration of Zop's effects?

A: Zop (Eszopiclone) has an average elimination half-life of around 6 hours in non-elderly adults, which is the time required for the amount of drug in the body to be reduced by half. Official guidance emphasizes that patients must have at least 7 to 8 hours available for sleep after taking a dose to reduce the risk of next-day impairment.

Q: Is it normal to feel a bit dizzy when first taking Zop?

A: Regulatory documents list dizziness and somnolence (drowsiness) as common adverse reactions. These central nervous system effects are especially noted in older adults, where official warnings state they can increase the potential for falls.

Q: Does taking Zop affect my ability to drive or operate machinery?

A: Official warnings state that Zop can cause significant next-day impairment, including reduced alertness and concentration. Regulatory warnings caution against driving or operating dangerous machinery due to the risk of impairment and reduced alertness.

Q: Does Zop have any known effects on mood?

A: Official labeling documents that Zop may be associated with abnormal thinking and behavior changes. These can include agitation, confusion, or hallucinations. There are also official reports of a potential worsening of depression, including suicidal thoughts and actions.

Q: What is the risk of dependence or withdrawal associated with Zop?

A: Zop is classified as a controlled substance due to the risk of physical and psychological dependence, which is higher with longer-term use and higher doses. Stopping the medicine abruptly may result in withdrawal symptoms and rebound insomnia, which is a temporary worsening of sleep difficulties.

Q: How long after starting Zop should I expect to see the full benefit?

A: Regulatory guidance suggests that if insomnia persists or worsens after 7 to 10 days of treatment, a healthcare professional may be contacted. Regulatory documentation describes that persistent insomnia may indicate the sleep problem is not being addressed or that a different condition is present.

Q: Can Zop be taken if I am planning to become pregnant?

A: Official documents state that Zop is not usually recommended during pregnancy because its effects are not fully established. Use during pregnancy is advised only if a healthcare professional determines the potential benefit to the patient outweighs the risk to the fetus.

Q: Can Zop be taken while breastfeeding?

A: Zop (Zopiclone) is not recommended for use while breastfeeding. The medicine passes into breast milk in small amounts, and official guidance notes that the potential risk to the infant should be weighed against the benefits of use.

Q: What happens if Zop is taken with grapefruit or grapefruit juice?

A: Zop is processed by a specific liver enzyme known as CYP3A4. Grapefruit juice is known to inhibit (slow down) this enzyme, which could lead to increased levels of Zop in the blood. This increase could potentially enhance the drug's effects and the risk of adverse reactions.

Q: Are there specific symptoms that warrant calling a doctor while taking Zop?

A: Official documentation describes that severe allergic reactions (e.g., swelling of the tongue or throat, trouble breathing) or the occurrence of complex sleep behaviors (e.g., sleep-driving) warrant immediate medical attention. Regulatory labeling states that the medicine is contraindicated following a complex sleep behavior event.

Q: Can Zop be used by teenagers or children?

A: Zop is officially approved for use only in adults (18 years and older). The regulatory documentation states that its use is contraindicated or safety is not established in pediatric populations, meaning children and adolescents under 18 years of age.

Q: Why do some people say Zop is a 'strong' medicine?

A: Zop is classified by government bodies as a sedative-hypnotic drug and is often scheduled as a controlled substance (Schedule IV). This classification indicates it has a potential for misuse and acts powerfully on the Central Nervous System (CNS) to induce sleep, which may contribute to the perception of it being a 'strong' medicine.

Q: Is Zop similar to other well-known medicines for the same condition?

A: Zop is classified as a nonbenzodiazepine hypnotic, a group commonly referred to as Z-drugs. It is structurally different from, but acts similarly to, the benzodiazepine class of medicines by targeting the GABA-A receptor in the brain.

Q: Can Zop cause weight changes?

A: Official reports from clinical studies of Eszopiclone list both weight gain and weight loss as possible, though uncommon, adverse reactions associated with the use of the medicine.

Q: What is the purpose of the different strengths of Zop available?

A: Official documents indicate the available strengths allow for dosing flexibility based on age and response. The maximum dose for adults is defined in regulatory labeling to manage the risk of next-day impairment.

Q: Is Zop available as a generic version?

A: Yes, Zop, referring to its active ingredients (Eszopiclone and Zopiclone), is generally available as a generic medication in many regions following the expiration of patent protection for the original brand name product.

Q: Are there different brand names for the medicine Zop?

A: Yes, the active ingredients in Zop are marketed globally under different brand names. Examples include Lunesta (for Eszopiclone) and Imovane (for Zopiclone).

Q: Does Zop interact with herbal remedies like St. John's Wort?

A: Official drug information explicitly names St. John's Wort as a substance that may interact with Zop. Because St. John’s Wort can speed up the enzyme (CYP3A4) that breaks down Zop, it could lead to lower levels of the medicine in the body, potentially making it less effective.

Q: What is the evidence regarding Zop's effect on sleep?

A: Official clinical trial summaries describe that Zop was found to decrease sleep latency (the time it takes to fall asleep) and improve sleep maintenance (total time spent asleep) when compared to participants who received an inactive placebo in the studies.

Q: What are the signs that Zop might not be working for me?

A: The official label suggests that if insomnia worsens or does not improve within 7 to 10 days of starting treatment, this may be an indicator that warrants discussion with a healthcare provider.

Q: Is Zop a new medicine or has it been around for a while?

A: Zop (Zopiclone) has been available since the 1980s. Its pure active isomer, Eszopiclone, was approved by the U.S. Food and Drug Administration (FDA) in 2004, confirming that these medicines have been used in clinical practice for a significant number of years.

Q: What should I do if a rare but serious side effect occurs while taking Zop?

A: Official guidance notes that symptoms of a severe allergic reaction or the experience of a complex sleep behavior are conditions that require immediate emergency medical attention. Furthermore, regulatory labeling indicates that Zop is formally contraindicated following an episode of complex sleep behavior.

How should Zop be stored and disposed of?

How to Store and Dispose of Zop?

The official storage and disposal requirements for Zop (Eszopiclone/Zopiclone) are strictly defined by regulatory guidance to ensure product integrity and public safety.

Storage Requirements

Condition Official Requirement
Temperature Store at controlled room temperature (e.g., 15 C to 30 C for Eszopiclone) and keep from freezing.
Environment Protect tablets from heat, moisture, and direct light. Do not store in high-humidity areas, such as a bathroom or near a sink.
Container Keep the medicine in its original, closed container or blister pack.
Security Mandatory requirement to keep the product out of the sight and reach of children and store it securely to prevent misuse.

Disposal Protocol

Unused or expired Zop must be disposed of safely according to official guidance. Do not throw away medicines via wastewater or household waste. Consult a pharmacist or healthcare professional for instructions on returning the product to a certified drug take-back program or disposing of it in accordance with local environmental regulations.

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

Equivalent of Zop found in:

A-Z Index: