Nocton

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Nocton

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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 Nocton

Property Description
Active ingredient Lormetazepam
Form Oral formulation (Tablets)
Pharmacological class Benzodiazepine, Hypnotic agent
General Purpose Management of insomnia and sleep disorders
Origin Synthetic compound

What Type of Medicine is Nocton (Lormetazepam)?

Nocton is a recognized brand-name pharmaceutical preparation whose active ingredient is Lormetazepam, a synthetic compound belonging to the Benzodiazepine chemical class. It is categorized as an intermediate-acting hypnotic agent prescribed to facilitate sleep. Lormetazepam is classified among the psychoactive medicines that act on the central nervous system. This classification confirms that the medicine’s role is to modulate brain function for therapeutic benefit, a mechanism that is clinically recognized for its efficacy in reducing sleep latency.

Composition and Pharmaceutical Form of Nocton

The formulation of Nocton is based on the single substance Lormetazepam, making it a single-ingredient product. The medication is administered via the oral route of administration and is predominantly available as an oral formulation in the form of tablets. This dosage form, which is characteristic of the Nocton brand, ensures ease of administration for adult patients managing temporary or chronic sleep disturbances. Lormetazepam is further characterized as an intermediate-acting compound, typically possessing a half-life profile that is often preferred for nocturnal use.

What is the General Purpose of This Hypnotic Agent?

The general purpose of this hypnotic agent is to reliably address sleep disorder pathology by facilitating the onset and maintenance of sleep. Lormetazepam functions as a Central Nervous System (CNS) depressant by enhancing the effect of the brain's main inhibitory chemical, Gamma-Aminobutyric Acid (GABA). This amplification leads to the core therapeutic benefit of immediate sedation and is the primary reason why the drug is utilized for treating insomnia. The intermediate-acting design ensures that this therapeutic effect aligns with a typical sleep cycle, helping an individual who needs to fall asleep quickly and stay asleep through the night.

Regulatory References

  1. NIH GABA Receptor Pharmacology

What side effects are possible with Nocton?

Possible Side Effects and Safety Information

The safety profile of Nocton (Lormetazepam) is officially documented by government regulatory bodies, classifying adverse reactions according to the body system affected and their expected frequency. As a Central Nervous System (CNS) depressant, many effects relate to Nervous System Disorders.

Frequency-Classified Adverse Reactions

Adverse reactions are classified by frequency as listed in regulatory documents:

Frequency Category Documented Adverse Reactions (Examples)
Very Common Sedation, Daytime Drowsiness
Common Dizziness, Ataxia (unsteadiness), Muscle Weakness, Asthenia (fatigue)
Rare Transient anterograde amnesia, Visual disturbances, Worsening of sleep apnoea
Frequency Not Known Dependence (physical and psychological), Falls, Suicidal ideation

Serious Adverse Reactions and Safety Constraints

The official labeling highlights several serious risks and restrictions for use. Serious adverse reactions include Respiratory Depression, which is a potentially fatal risk, especially when combined with other CNS depressants such as opioids. Life-threatening Withdrawal Reactions, including convulsions, may occur following abrupt discontinuation after continued use.

Safety-Related Restrictions formally state that Lormetazepam is contraindicated (should not be used) in patients with conditions such as severe respiratory insufficiency, sleep apnoea syndrome, and myasthenia gravis.

Population and Duration-Related Safety Patterns

Specific safety considerations apply to certain groups: Older Adults have an officially documented increased susceptibility to effects like unsteadiness and dizziness, which can lead to an increased risk of falling. Furthermore, official regulatory texts specify that the risk of physical and psychological dependence is directly tied to the dose and duration of treatment.

This framework of officially classified effects and constraints defines the drug's regulatory safety boundaries and risk profile.

Overdose and Emergency Response

Overdose and When to Seek Help

An overdose of Lormetazepam (Nocton) is formally documented in regulatory sources by a spectrum of Central Nervous System (CNS) depression manifestations. Mild to moderate signs may include drowsiness, disorientation, slurred speech (dysarthria), and impaired coordination (ataxia). Less frequently, a paradoxical excitation or agitation may be observed.

Severe and Life-Threatening Manifestations Overdose can progress rapidly to severe outcomes, including profound sedation and coma. The most critical regulatory concern is the risk of respiratory depression (slowed or shallow breathing) and significant low blood pressure (hypotension). The risk of life-threatening events, including death, is explicitly documented to increase when Lormetazepam is used concomitantly with other CNS depressants, such as opioids.

Required Emergency Actions Regulatory guidance explicitly mandates that individuals must seek immediate medical attention or contact emergency services if a Lormetazepam overdose is suspected or if severe manifestations occur. Management involves supportive care and continuous monitoring of vital signs in a hospital setting, as outlined in official prescribing information. The regulatory documents note that a specific benzodiazepine antagonist, Flumazenil, may be considered. Special considerations apply to the elderly, who are more susceptible to severe CNS effects, and to neonates, who face documented risks of hypotonia and respiratory depression.

Therapeutic Uses of Nocton

What Nocton Treats: Main Uses and Benefits

The active ingredient Lormetazepam is used for the treatment of short-term insomnia.

This medication is generally used to help manage severe and moderately severe insomnia, applied across therapeutic domains where additional symptomatic support is needed to address significant disruption to sleep patterns. It is commonly used across conditions presenting with acute or disruptive episodes of sleeplessness. The medication is applied in addressing key symptom clusters that interfere with daily comfort, such as: difficulty falling asleep and frequent nocturnal awakenings.

“This agent is applied when short-term symptomatic assistance is needed, offers symptomatic relief that helps patients cope more steadily.”

Nocton is relevant in clinical settings that involve acute or unstable symptom patterns, typically for short-term or transient episodes of sleep difficulty. It assists with maintaining functional stability in adult patients by providing support for achieving necessary sleep induction when symptoms become temporarily overwhelming.


Quick Fact: Relief for Sleep Onset Difficulties The medication is commonly used to help with facilitating sleep onset and may assist with managing the symptoms of frequent awakenings, supporting general well-being during symptomatic phases.

Eligibility and Restrictions for Use

Nocton (Lormetazepam) is a hypnotic agent whose eligibility is strictly defined by regulatory documents, limiting its use primarily to adult patients for short-term management. Use in paediatric populations (under 18 years of age) is not recommended, as safety and efficacy have not been established in this group.

Absolute Contraindications

The medicine is formally contraindicated and must not be used in individuals with several specific conditions, including:

  • Severe Organ Function: Severe respiratory insufficiency, Sleep Apnoea Syndrome, or severe hepatic insufficiency (due to the risk of encephalopathy).
  • Neuromuscular Disease: Myasthenia gravis.
  • Allergy: Known hypersensitivity to Lormetazepam or any other benzodiazepine.

Special Restrictions and Caution

  • Age: Elderly patients must be treated with caution and administered a reduced initial dose.
  • Dependence Risk: Use should be avoided or requires extreme caution in patients with a history of alcohol or drug abuse.
  • Physiological State: Nocton should not be used during pregnancy and should not be administered during lactation. Patients with severe renal insufficiency also require special caution and dose consideration.

What should I know about interactions with other medicines?

Nocton (zaleplon) can interact with a variety of medicines and substances, potentially altering its effect or increasing the risk of side effects. It is critical to inform your healthcare provider of all prescription and non-prescription drugs, herbal supplements, and alcohol use before starting this medication.

Central Nervous System (CNS) Depressants

The most significant interaction involves other CNS depressants. Concomitant use with these agents can lead to an additive sedative effect, increasing the risk of profound drowsiness, dizziness, slowed breathing (respiratory depression), and potentially life-threatening overdose. Alcohol must be avoided entirely for this reason. Other interacting CNS depressants include:

  • Opioids (e.g., tramadol, morphine)
  • Benzodiazepines (e.g., alprazolam, lorazepam)
  • Antihistamines that cause drowsiness (e.g., diphenhydramine)
  • Other sleep medications
  • Certain antidepressants and antipsychotics

Interactions Affecting Nocton's Metabolism

Nocton is primarily metabolized by the enzyme aldehyde oxidase and, to a lesser extent, by the cytochrome P450 (CYP) 3A4 enzyme. Medicines that affect these enzymes can alter the level of Nocton in the blood:

Type of Interaction Examples of Interacting Medicines Effect on Nocton (Zaleplon)
Enzyme Inhibitors Cimetidine, Erythromycin, Ketoconazole Increased Nocton level; may require a dose reduction.
Enzyme Inducers Rifampin, Phenobarbital, Carbamazepine Decreased Nocton level; may reduce its effectiveness.

Taking Nocton with food, particularly a high-fat meal, can also slow down its absorption and delay the time it takes to work.

Mechanism of Action

Positive Modulation of the GABA A Receptor Complex

Nocton exerts its primary pharmacodynamic effect as a positive allosteric modulator of the mathbf GABA A receptor complex, which is the principal inhibitory neurotransmitter system in the central nervous system (mathbf CNS). The drug binds to a specific mathbf benzodiazepine binding site located at the interface of the alpha and gamma subunits of the pentameric receptor structure. This binding does not directly activate the receptor but induces a conformational change that enhances the affinity and functional effect of the endogenous inhibitory neurotransmitter, mathbf GABA.

Enhancing Central Nervous System Inhibition

The enhanced GABAergic activity results in a sustained increase in the frequency of chloride channel opening within the receptor complex. The resulting mathbf influx of chloride ions into the post-synaptic neuron causes membrane hyperpolarization, making the neuron less likely to fire an action potential. This mechanism produces a generalized reduction in neuronal excitability across various regions of the CNS, modulating overall neuronal network output and determining the resulting level of CNS depression.

Dosage and Administration Information

Nocton (Lormetazepam) is administered exclusively via the oral route, typically available as tablets in strengths such as 0.5 mg and 1.0 mg. The standard adult dose range is officially specified as 0.5 mg to 1.5 mg per dose. This hypnotic agent is strictly intended for once-daily administration and must be taken just before going to bed at night. The tablets are to be swallowed whole with water or some other liquid, ensuring the patient can dedicate seven to eight hours of uninterrupted sleep after administration.

The duration of therapy is required to be as short as possible, generally lasting only a few days to two weeks. The absolute maximum length of treatment is four weeks, which must incorporate a period of gradual dose reduction (tapering). This mandatory dose reduction is a procedural step to properly conclude the course of therapy.

For specific populations, modifications are recommended: elderly patients, as well as those with hepatic or respiratory impairment, should be started on a reduced initial dose. In the event a dose is forgotten, the instruction is to skip the missed dose and resume the usual single dose when it is next due, without ever taking a double dose. This administration protocol defines the standardized approach to using the medication.

Recent Clinical Evidence

Research Evidence: Overview of Studies for Nocton (Lormetazepam)

How Nocton (Lormetazepam) Was Studied in Research

This section will introduce the types of studies that form the basis of the drug's use, such as the short-term Randomized Controlled Trials (RCTs) and placebo-controlled trials, and describe what metrics were typically monitored in the research.

The research base for Lormetazepam, the ingredient in Nocton, primarily includes short-term Randomized Controlled Trials (RCTs) and double-blind, placebo-controlled comparative studies. These types of studies are often used to compare the drug's action against a placebo (an inactive substance) or against other prescription sleep aids, to examine how symptom patterns were monitored during a defined period. Nocton was evaluated in research exploring how sleep patterns evolve in individuals with sleep disturbances.

Evidence Base for Short-Term Insomnia and Sleep Disturbances

This section will summarize the research findings from clinical trials concerning the use of Nocton in individuals experiencing moderate to severe sleep difficulties, focusing on what the studies reported about parameters like time to fall asleep and frequency of nighttime awakenings.

Studies reported measurements for the time elapsed before participants fell asleep and the measured duration of their sleep. Research includes documentation of measurements taken during the study period, particularly when the trials focused on episodes where symptoms became more noticeable. These studies contribute to the broader evidence landscape by providing context for short-term measurements of key sleep patterns within the specific conditions of the trials.

What Remains Uncertain About the Research for Nocton

The research provides insight into short-term measurements, but several aspects remain unstudied or uncertain within the broader evidence base. A primary limitation is that long-term effects are not fully established because follow-up durations were limited.

Studies monitored patterns related to the development of dependence or potential tolerance within the short timeframes of the clinical trials. Sample sizes were modest in some studies, and evidence quality varies across studies, meaning the research does not determine whether an individual will respond similarly to the group patterns described in the data. Comparative evidence against newer sleep medications is not available in the older research base.

Key Studies & References NIH GABA Receptor Pharmacology (National Institutes of Health)

Frequently Asked Questions (FAQ)

Common questions about Nocton (FAQ)


Q: How long does Nocton typically take to start working?

Official guidance states that Nocton should be taken just before going to bed when you are ready to fall asleep. The patient information leaflet states that the medicine should be taken only when a patient is able to dedicate the required seven to eight hours of uninterrupted sleep.


Q: What is the average length of time Nocton stays active in the body?

According to the official product information, the active ingredient in Nocton, Lormetazepam, has an elimination half-life of approximately 10 hours. The half-life is a measure of the time it takes for the amount of medicine in the body to be reduced by half.


Q: Does Nocton interact with alcohol?

Regulatory documents advise that alcohol should be avoided entirely when using Nocton. Combining this medicine with alcohol can lead to an additive sedative effect, increasing the risk of profound drowsiness, dizziness, and slowed breathing.


Q: What does the research say about Nocton's effect on sleep architecture?

Clinical research conducted on the drug included measurements taken to study sleep patterns and how they evolve in individuals experiencing sleep disturbances. This type of research provides context on how the medicine affects sleep patterns.


Q: What is the difference between Nocton and a typical benzodiazepine?

According to official regulatory classifications, Nocton's active ingredient, Lormetazepam, is categorized as a Benzodiazepine. It is specifically described as an intermediate-acting hypnotic agent, meaning its primary purpose is to help facilitate sleep.


Q: Does Nocton have a risk of dependence or withdrawal according to official documents?

Official product information confirms that the use of this medicine carries a risk of physical and psychological dependence. The risk is described as being directly tied to the dose and duration of treatment. Additionally, documents note that withdrawal symptoms may occur following abrupt cessation after continued use.


Q: Can Nocton be taken every night?

Official guidance specifies that the duration of treatment should be kept as short as possible. Regulatory documents state that treatment should generally last only a few days to two weeks, with a maximum treatment length of four weeks, which is designed to incorporate a period of gradual dose reduction.


Q: Are there any specific foods or drinks that should be avoided when using Nocton?

Official safety warnings state that alcohol must be avoided entirely. Furthermore, taking Nocton with a high-fat meal is described as potentially slowing down its absorption and delaying the time it takes for the medicine to work.


Q: Is Nocton known to interact with herbal supplements like St. John's Wort?

Official interaction information categorizes certain medicines and supplements as enzyme inducers, which can cause a decreased level of Nocton in the blood. This reduction can potentially affect the medicine's overall effectiveness.


Q: What is meant by the phrase 'transient side effects' when discussing Nocton?

When discussing Nocton, 'transient side effects' refers to effects that are typically temporary. Official documents note that some effects, such as dizziness or fatigue, may be present at the beginning of treatment but are expected to disappear with continued administration.


Q: Why might a doctor limit the duration of Nocton use?

The official treatment duration is strictly limited (to a maximum of four weeks) by regulatory guidance. This restriction is specified because the risk of dependence (both physical and psychological) and the potential development of tolerance are tied to the dose and duration of the therapy.


Q: Are there different forms (e.g., tablet, liquid) of Nocton available?

Regulatory documents describe Nocton as an oral formulation. The medication is predominantly available as a tablet dosage form for administration.


Q: Why do some people report feeling dizzy the morning after taking Nocton?

Official documents list daytime drowsiness and dizziness as common side effects of Nocton. These effects are related to the medicine's impact as a central nervous system depressant and may sometimes persist into the morning following nocturnal use.


Q: What evidence exists regarding Nocton's long-term use?

Official documents state that the long-term effects are not fully established because follow-up periods were typically limited in the clinical trials conducted. The existing research provides insight primarily into the short-term use of the medicine.


Q: What official studies have examined Nocton's impact on driving ability?

Official safety information explicitly addresses the drug's influence on the ability to drive and use machines. This is due to known effects like sedation, dizziness, and impaired concentration that are listed in the regulatory documents.


Q: What is the official stance on Nocton use in children or adolescents?

The medicine is not recommended for use in children or adolescents (those under 18 years of age). This official restriction is based on the fact that the safety and efficacy of Nocton have not been established in this particular age group.


Q: What is the general relationship between Nocton and other medicines that cause drowsiness?

When used with other Central Nervous System (CNS) depressants, Nocton can result in an additive sedative effect. This combination increases the overall risk of severe side effects, including slowed breathing (respiratory depression).


Q: Is it possible to develop a tolerance to Nocton over time?

Regulatory documents report that a phenomenon known as tolerance may develop with continued use. This is described as some loss of efficacy in the hypnotic effects after the medicine has been used repeatedly for a few weeks.


Q: What should a patient know about the possibility of rebound effects after stopping Nocton?

The official label describes the risk of rebound insomnia following cessation of treatment. This is defined as the temporary return of the sleep difficulty symptoms with increased intensity upon discontinuation of the medicine.


Q: Why is it important to share a complete medicine list with a doctor before starting Nocton?

Regulatory guidance emphasizes that the medicine can interact with a wide variety of prescription, non-prescription drugs, and supplements. Sharing a complete medicine list is important because these interactions can alter Nocton's effect or increase the risk of serious side effects.


Q: Does official information mention a link between Nocton and unusual nighttime behaviors?

Official regulatory documents report the occurrence of psychiatric and paradoxical reactions associated with benzodiazepine use. These reactions can include manifestations such as hallucinations, agitation, and other forms of abnormal behaviour.

How should Nocton be stored and disposed of?

Storage Conditions

Nocton (Lormetazepam) tablets must be stored at Controlled Room Temperature, defined as 20 C to 25 C (68 F to 77 F), with permitted temperature excursions up to 30 C (86 F). The medication must be kept in its original container, tightly closed, and stored away from excess heat and moisture (such as a bathroom).

Storage & Protection Requirements
Temperature: Controlled Room Temperature (20 C to 25 C)
Protection: Tightly closed container, protect from heat and moisture
Child Safety: Store out of sight and reach of children and pets

Disposal Instructions

As a controlled medicine, Nocton requires specific disposal procedures to prevent misuse and environmental contamination. Unused or expired medication must be disposed of in accordance with local regulations and cannot be thrown into the household trash or flushed down the toilet unless specifically authorized by the labeling.

It is recommended to use official drug take-back programs or authorized collection sites to ensure the proper, secure disposal of the medicine.

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

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