Nitrazepam

Nitrazepamum

For medical students2 min readUpdated 2026-10-10

Nitrazepam (Nitrazepamum) is a widely prescribed medication used primarily for the treatment of insomnia. Its distinguishing feature is a long half-life, which not only ensures prolonged sleep but also carries risks of hangover effects and drug accumulation in the body.

Dosage FormAvailable exclusively as oral tablets.

Onset of ActionHypnotic effect typically develops 30–60 minutes after administration.

Duration of EffectTherapeutic duration ranges from 6 to 8 hours.

Half-lifeRanges from 24 to 36 hours, creating a high risk of substance accumulation.

Clinical Application and Indications

In modern medical practice, nitrazepam is regarded as a classic agent for managing sleep disorders. The primary indication for its prescription is insomnia of various origins.

Beyond somnology, the drug is used in other medical fields. Due to its pronounced anticonvulsant activity, it is used to manage specific types of seizure disorders, which is particularly relevant in pediatric practice. Nitrazepam is also included in premedication regimens prior to various surgical procedures to prepare the patient and reduce anxiety levels.

Pharmacokinetics and Dosing Considerations

The drug is available in tablet form. To achieve optimal effects in treating insomnia, nitrazepam is recommended to be taken orally 30–40 minutes before the intended bedtime.

The therapeutic effect manifests within 30–60 minutes and lasts for 6–8 hours, covering the physiological requirement for nighttime sleep. However, a key pharmacokinetic feature is its very long half-life ($t_{1/2}$), which varies between 24 and 36 hours. This characteristic requires special caution when prescribing, as slow elimination from the body creates a direct predisposition to drug accumulation with regular use.

Side Effects and Effects on the Body

Adverse reactions during nitrazepam therapy are directly related to its pharmacokinetic profile. The significant duration of action and long $t_{1/2}$ provoke pronounced hangover effects. The day after administration, patients often complain of daytime drowsiness, general weakness, impaired concentration, and slowed mental and motor reactions. This negatively impacts psychomotor performance and work capacity.

Systemic side effects include:

Decreased blood pressure (hypotension).
Risk of respiratory depression.

Of particular note are paradoxical reactions, which may include increased aggressiveness, episodes of acute agitation, motiveless fear, and worsening sleep disorders. Such complications are significantly more common when combined with alcohol consumption.

Drug Interactions and Long-Term Use

Nitrazepam enters into dangerous interactions with other central nervous system depressants. Primarily, it potentiates (multiplies) the effects of alcohol and other CNS depressants. Features of long-term use include not only the potential for accumulation but also a high risk of developing tolerance, which may eventually require dose adjustment or discontinuation.

Contraindications

The use of nitrazepam is strictly restricted in several conditions and pathologies. Absolute contraindications include:

Proven hypersensitivity to the drug components.
Myasthenia gravis (prohibited due to the drug's myorelaxant effect).
Angle-closure glaucoma.
History of drug dependence.
Acute poisoning with any CNS depressants.
Pregnancy and lactation periods.

Frequently asked questions

What pharmacological group and subgroup does nitrazepam belong to?

Nitrazepam belongs to non-narcotic hypnotic agents. In classification, it occupies the following position:

Group — Benzodiazepine receptor agonists (benzodiazepine derivatives);
Subgroup by duration — Intermediate-acting agents (12–40 hours);
Clinical effect — Benzodiazepine tranquilizers with hypnotic properties.

What is the mechanism of action of nitrazepam at the synaptic level?

The mechanism of action is based on enhancing GABAergic inhibition in the CNS. Nitrazepam binds to specific allosteric benzodiazepine receptors (interacting with the $\gamma$-subunit of the GABA$_A$ receptor). This induces conformational changes in the receptor structure and increases its affinity for the neurotransmitter. As a result, the frequency of chloride channel opening increases, leading to a massive influx of chloride ions into the neuron, cellular membrane hyperpolarization, and neuronal inhibition.

What main pharmacological effects does nitrazepam produce?

Nitrazepam produces a complex depressant effect on the central nervous system. The main pharmacological effects include:

Anxiolytic — elimination of fear, anxiety, and mental tension;
Sedative — calming effect manifested at lower doses;
Hypnotic — facilitates sleep onset at higher doses;
Myorelaxant — reduces skeletal muscle tone by inhibiting polysynaptic reflexes;
Anticonvulsant — suppression of seizure activity;
Amnestic — ability to induce anterograde amnesia.

What symptoms characterize acute nitrazepam overdose?

Acute nitrazepam overdose is characterized by central nervous system depression: somnolence, lethargy, and ataxia (impaired motor coordination). Coma and respiratory depression may occur in severe cases.

What specific antidote is used for nitrazepam poisoning?

Flumazenil is used as a specific antidote for nitrazepam poisoning. Chemically an imidazobenzodiazepine, it acts as a competitive antagonist at benzodiazepine receptors. Flumazenil is administered intravenously (including by infusion) to reverse agonist effects, promoting the restoration of respiration and consciousness in overdose.

Why might a patient feel weak and drowsy the day after taking nitrazepam?

This is due to pronounced hangover effects. The drug's half-life reaches 24–36 hours, meaning it does not manage to be fully eliminated from the body by morning, continuing to depress the CNS, slow reactions, and impair attention.

How does nitrazepam interact with alcohol?

The drug potentiates the effects of alcohol and other CNS depressants. Combining it with ethanol also sharply increases the risk of paradoxical reactions, such as aggressiveness, acute agitation, and fear.

Why is nitrazepam contraindicated in myasthenia gravis?

The contraindication in myasthenia gravis is due to the fact that nitrazepam possesses skeletal muscle relaxant properties, which can worsen muscle weakness in such patients.

What are the dangers of long-term use of this drug?

Prolonged use of nitrazepam carries the risk of drug accumulation due to its slow elimination, as well as the development of tolerance to its therapeutic effects.

Go deeper

Particularities of using nitrazepam in pediatric practice for managing seizure syndromes.
Mechanisms of drug accumulation and tolerance development with long-acting hypnotics.
Pathogenesis of paradoxical reactions during the interaction of CNS depressants with alcohol.
Comparative analysis of the muscle-relaxant action of nitrazepam and other drugs in the context of contraindications (myasthenia gravis).