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Nitrazepam

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Nitrazepam
Clinical data
Trade namesAlodorm, Apodorm, Arem, Insoma, Insomin, Mogadon, Nitrados, Nitrazadon, Nitrosun, Ormodon, Paxadorm, Remnos, and Somnite
AHFS/Drugs.comInternational Drug Names
Pregnancy
category
  • AU: D
Routes of
administration		Oral
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability53–94%
MetabolismHepatic
Elimination half-life16–38 hours
ExcretionRenal
Identifiers
  • 7-nitro-5-phenyl-1H-benzo[e][1,4]diazepin-2(3H)-one
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard100.005.151 Edit this at Wikidata
Chemical and physical data
FormulaC15H11N3O3
Molar mass281.3 g/mol g·mol−1
3D model (JSmol)
  • [O-][N+](C1=CC2=C(C=C1)NC(CN=C2C3=CC=CC=C3)=O)=O
  • InChI=1S/C15H11N3O3/c19-14-9-16-15(10-4-2-1-3-5-10)12-8-11(18(20)21)6-7-13(12)17-14/h1-8H,9H2,(H,17,19) checkY
  • Key:KJONHKAYOJNZEC-UHFFFAOYSA-N checkY
 ☒NcheckY (what is this?)  (verify)
Alodorm bottle containing 25 tablets of 5mg Nitrazepam.

Nitrazepam is a hypnotic drug of the benzodiazepine class, indicated for the short-term relief of severe, disabling anxiety and insomnia.[1] It also has sedative and motor-impairing properties,[2] as well as amnestic, anticonvulsant, and skeletal muscle relaxant effects.

It is marketed under the trade names: Alodorm, Arem, Insoma, Insomin, Mogadon, Nitrados, Nitrazadon, Nitrosun, Ormodon, Paxadorm, Remnos, and Somnite.[3][4]

Medical use

Nitrazepam is used to treat short-term sleeping problems (insomnia),[5] namely difficulty falling asleep, frequent awakening, early awakening, or a combination of each.

Nitrazepam is sometimes used for refractory epilepsies. However, long-term prophylactic treatment of epilepsy has considerable drawbacks. Most importantly, the loss of antiepileptic effects due to tolerance which renders prolonged nitrazepam therapy ineffective. It also has the drawback of significant side effects such as sedation, which is why nitrazepam and benzodiazepines in general are only prescribed in the acute management of epilepsies.[6] Nitrazepam has been found to be more effective than clonazepam in the treatment of West syndrome, which is an age-dependent epilepsy, affecting the very young. However, as with other epilepsies treated with benzodiazepines, long-term therapy becomes ineffective with prolonged treatment, and the side effects of hypotonia and drowsiness are troublesome with nitrazepam therapy; other antiepileptic agents are therefore recommended for long-term therapy, possibly corticotropin (ACTH) or vigabatrin.[7] In uncontrolled studies, nitrazepam has shown effectiveness in infantile spasms; it is sometimes considered as a treatment option for this indication when other drugs fail to control infantile spasms.[8]

Side effects

Common side effects

Central nervous system depression, including somnolence, dizziness, depressed mood, rage, violence, fatigue, ataxia, headache, vertigo, impairment of memory, impairment of motor functions, hangover feeling in the morning, slurred speech, decreased physical performance, numbed emotions, reduced alertness, muscle weakness, double vision, and inattention have been reported. Unpleasant dreams and rebound insomnia have also been reported. High levels of confusion and clumsiness also occurs after administration of nitrazepam, as well as [9] increased reaction time, co-ordination problems, and impaired learning and memory.[10]

Impaired learning and memory occurs due to the action of the drug on benzodiazepine receptors which causes a dysfunction in the cholinergic neuronal system.[11] Nitrazepam causes a reduced output of serotonin, which is closely involved in regulating mood and may be the cause of feelings of depression in users of nitrazepam or other benzodiazepines.[12]

Nitrazepam is a long-acting benzodiazepine with an elimination half-life of 15–38 hours (mean elimination half-life 26 hours).[1] Residual "hangover" effects after nighttime administration of nitrazepam such as sleepiness, impaired psychomotor and cognitive functions may persist into the next day, which may impair the ability of users to drive safely and increases the risk of falls and hip fractures.[13] Significant impairment of visual perception and sedative effects persisting into the next day typically occur with nitrazepam administration as was demonstrated in a human clinical trial assessing the effect of nitrazepam on peak saccade velocity.[14]

Impairment of psychomotor function may especially occur after repeated administration, with the elderly being more vulnerable to this adverse effect.[15] Overall accuracy of completing tasks is impaired after repeated administration of nitrazepam and is due to drug accumulation of nitrazepam. The elderly are more vulnerable to these side effects.[16]

Less common side effects

Hypotension,[17] faintness, palpitation, rash or pruritus, gastrointestinal disturbances, and changes in libido are less common. Very infrequently, paradoxical reactions may occur, for example, excitement, stimulation, hallucinations, hyperactivity, and insomnia. Also, depressed or increased dreaming, disorientation, severe sedation, retrograde amnesia, headache, hypothermia, and delirium tremens are reported.[18] Acroparaesthesia has been reported as a side effect from nitrazepam with symptoms including, pins and needles in hands and loss of power and clumsiness of the fingers.[19] Severe liver toxicity has also been reported.[20]

Tolerance dependence and withdrawal

Tolerance

Tolerance to a drug's effects occurs after regular exposure to it. The mechanism of nitrazepam tolerance may be due to down-regulation of benzodiazepine receptors (observed in rats).[21] When tolerance and habituation occurs to nitrazepam, its pharmacokinetic profile changes with absorption of the drug slowing down, elimination increasing, and brain concentration increasing significantly.[22] Increased levels of GABA in cerebral tissue and alterations in the activity state of the serotoninergic system occur as a result of nitrazepam tolerance.[23]

Tolerance to the sleep-inducing effects of nitrazepam occurs after about seven days;[24][25] tolerance also frequently occurs to its anticonvulsant effects.[26][27] A benzodiazepine dependence can develop, with a benzodiazepine withdrawal syndrome occurring when the drug is stopped or the dose lowered.[28] Common withdrawal symptoms include; anxiety, insomnia, concentration problems and fatigue.[29] Long-term effects of benzodiazepines such as nitrazepam include worsening mental and physical health, as well as cognitive deficits[30][31] and immunological disturbances.[32]

After six days of use, tolerance to nitrazepam's but not temazepam's sleep-inducing effects and performance-impairing effects occurred in a study.[24] One study demonstrated tolerance to the sleep-promoting effects of nitrazepam and temazepam after seven days nightly administration in 19 elderly inpatients. Self-reported quality of sleep was found to be increased after the first night's administration of either nitrazepam or temazepam, but by day seven, self-reported quality of sleep was found to have returned to baseline in these patients, suggesting the development of tolerance after seven days' use. The effect was more pronounced in patients of lower intelligence.[25] In mice, tolerance to the anticonvulsant properties of nitrazepam developed profoundly and rapidly over six days, and then did not proceed. Some anticonvulsant effects were still apparent after six days' administration.[33] In humans, tolerance to the anticonvulsant effects of nitrazepam is a frequent occurrence.[26][27]

Dependence and withdrawal

See also: Benzodiazepine withdrawal syndrome

Benzodiazepine drugs such as nitrazepam can cause dependence, addiction, and benzodiazepine withdrawal syndrome. Withdrawal from nitrazepam or other benzodiazepines often leads to withdrawal symptoms which are similar to those seen with alcohol and barbiturates, including delirium tremens.[34][35] The higher the dose and the longer the drug is taken, the greater the risk of experiencing unpleasant withdrawal symptoms. Withdrawal symptoms can occur at standard dosages, though, and after short-term treatment. Benzodiazepine treatment should be discontinued as soon as possible by a slow and gradual dose reduction regimen.[36] Common withdrawal symptoms include anxiety, insomnia, concentration problems, and fatigue.[29]

Frequent use of nitrazepam may cause dependence, and when the drug is reduced or stopped, withdrawal symptoms occur, such as a worsening of insomnia compared to baseline typical after discontinuation of nitrazepam even after short-term single nightly dose therapy.[37] Dependence on benzodiazepines such as nitrazepam or temazepam often occurs due to discharging patients from hospital on benzodiazepines who were started on benzodiazepine hypnotics in hospital. Hypnotic use in hospitals is recommended to be limited to five days to avoid the development of drug dependence and withdrawal insomnia.[28]

After discontinuation of nitrazepam, a rebound effect may occur about four days after stopping medication.[38] Nitrazepam has more side effects than other hypnotic drugs, and tolerance to sedative properties and rebound insomnia after discontinuation occurs after only seven days' administration.[39] Tolerance to the anticonvulsant and anxiolytic effects also develops rapidly during daily administration.[40]

Abrupt withdrawal after long-term use from therapeutic doses may result in a severe benzodiazepine withdrawal syndrome. Reports in the medical literature report of two psychotic states developing after abrupt withdrawal from nitrazepam including delirium after abrupt withdrawal of 10 mg of nitrazepam, and in another case, auditory hallucinations and visual cognitive disorder developed after abrupt withdrawal from 5 mg of nitrazepam and 0.5 mg of triazolam. Gradual and careful reduction of the dosage was recommended to prevent severe withdrawal syndromes from developing.[41] Antipsychotics increase the severity of benzodiazepine withdrawal effects with an increase in the intensity and severity of convulsions.[42] Depersonalisation has also been reported as a benzodiazepine withdrawal effect from nitrazepam.[43]

Special precautions

Benzodiazepines require special precautions if used in alcohol- or drug-dependent individuals and individuals with comorbid psychiatric disorders.[44] Caution should be exercised in prescribing nitrazepam to anyone who is of working age due to the significant impairment of psychomotor skills; this impairment is greater when the higher dosages are prescribed.[45]

Nitrazepam in doses of 5 mg or more causes significant deterioration in vigilance performance combined with increased feelings of sleepiness.[46] Nitrazepam at doses of 5 mg or higher impairs driving skills[47] and like other hypnotic drugs, it is associated with an increased risk of traffic accidents.[48] In the elderly, nitrazepam is associated with an increased risk of falls and hip fractures due to impairments of body balance.[49] The elimination half-life of nitrazepam is 40 hours in the elderly and 29 hours in younger adults.[50][51] Nitrazepam is commonly taken in overdose by drug abusers or suicidal individuals, sometimes leading to death.[52][53][54] Nitrazepam is teratogenic if taken in overdose during pregnancy with 30% of births showing congenital abnormalities.[55] It is a popular drug of abuse in countries where it is available.[56][57][58]

Doses as low as 5 mg can impair driving skills.[47] Therefore, people driving or conducting activities which require vigilance should exercise caution in using nitrazepam or possibly avoid it altogether.[59]

Elderly

Nitrazepam, similar to other benzodiazepines and nonbenzodiazepines, causes impairments in body balance and standing steadiness in individuals who wake up at night or the next morning. Falls and hip fractures are frequently reported. Combination with alcohol increases these impairments. Partial but incomplete tolerance develops to these impairments.[49] Nitrazepam has been found to be dangerous in elderly patients due to a significantly increased risk of falls.[60] This increased risk is probably due to the drug effects of nitrazepam persisting well into the next day.[61] Nitrazepam is a particularly unsuitable hypnotic for the elderly as it induces a disability characterised by general mental deterioration, inability to walk, incontinence, dysarthric, confusion, stumbling, falls, and disoriention which can occur from doses as low as 5 mg. The nitrazepam-induced symptomatology can lead to a misdiagnosis of brain disease in the elderly, for example dementia, and can also lead to the symptoms of postural hypotension which may also be misdiagnosed. A geriatric unit reportedly was seeing as many as seven patients a month with nitrazepam-induced disabilities and health problems. The drug was recommended to join the barbiturates in not being prescribed to the elderly.[62] Only nitrazepam and lorazepam were found to increase the risk of falls and fractures in the elderly.[63] CNS depression occurs much more frequently in the elderly and is especially common in doses above 5 mg of nitrazepam.[64] Both young and old patients report sleeping better after three nights' use of nitrazepam, but they also reported feeling less awake and were slower on psychomotor testing up to 36 hours after intake of nitrazepam. The elderly showed cognitive deficits, making significantly more mistakes in psychomotor testing than younger patients despite similar plasma levels of the drug, suggesting the elderly are more sensitive to nitrazepam due to increased sensitivity of the aging brain to it. Confusion and disorientation can result from chronic nitrazepam administration to elderly subjects. Also, the effects of a single dose of nitrazepam may last up to 60 hours after administration.[65]

Children

Nitrazepam is not recommended for use in those under 18 years of age. Use in very young children may be especially dangerous. Children treated with nitrazepam for epilepsies may develop tolerance within months of continued use, with dose escalation often occurring with prolonged use. Sleepiness, deterioration in motor skills and ataxia were common side effects in children with tuberous sclerosis treated with nitrazepam. The side effects of nitrazepam may impair the development of motor and cognitive skills in children treated with nitrazepam. Withdrawal only occasionally resulted in a return of seizures and some children withdrawn from nitrazepam appeared to improve. Development, for example the ability to walk at five years of age, was impaired in many children taking nitrazepam, but was not impaired with several other nonbenzodiazepine antiepileptic agents. Children being treated with nitrazepam have been recommended to be reviewed and have their nitrazepam gradually discontinued whenever appropriate.[27] Excess sedation, hypersalivation, swallowing difficulty, and high incidence of aspiration pneumonia, as well as several deaths, have been associated with nitrazepam therapy in children.[8]

Pregnancy

Nitrazepam is not recommended during pregnancy as it is associated with causing a neonatal withdrawal syndrome[66] and is not generally recommended in alcohol- or drug-dependent individuals or people with comorbid psychiatric disorders.[44] The Dutch, British and French system called the System of Objectified Judgement Analysis for assessing whether drugs should be included in drug formularies based on clinical efficacy, adverse effects, pharmacokinetic properties, toxicity, and drug interactions was used to assess nitrazepam. A Dutch analysis using the system found nitrazepam to be unsuitable in drug-prescribing formularies.[67]

The use of nitrazepam during pregnancy can lead to intoxication of the newborn. A neonatal withdrawal syndrome can also occur if nitrazepam or other benzodiazepines are used during pregnancy with symptoms such as hyperexcitability, tremor, and gastrointestinal upset (diarrhea or vomiting) occurring. Breast feeding by mothers using nitrazepam is not recommended.[68] Nitrazepam is a long-acting benzodiazepine with a risk of drug accumulation, though no active metabolites are formed during metabolism. Accumulation can occur in various body organs, including the heart; accumulation is even greater in babies. Nitrazepam rapidly crosses the placenta and is present in breast milk in high quantities. Therefore, benzodiazepines including nitrazepam should be avoided during pregnancy.[69] In early pregnancy, nitrazepam levels are lower in the baby than in the mother, and in the later stages of pregnancy, nitrazepam is found in equal levels in both the mother and the unborn child.[70] Internationally benzodiazepines are known to cause harm when used during pregnancy and nitrazepam is a category D drug during pregnancy.

Benzodiazepines are lipophilic and rapidly penetrate membranes, so rapidly penetrate the placenta with significant uptake of the drug. Use of benzodiazepines such as nitrazepam in late pregnancy in especially high doses may result in floppy infant syndrome.[71] Use in the third trimester of pregnancy may result in the development of a severe benzodiazepine withdrawal syndrome in the neonate. Withdrawal symptoms from benzodiazepines in the neonate may include hypotonia, and reluctance to suckle, to apnoeic spells, cyanosis, and impaired metabolic responses to cold stress. These symptoms may persist for hours or months after birth.[66]

Other precautions

Caution in hypotension

Caution in those suffering from hypotension, nitrazepam may worsen hypotension.[17]

Caution in hypothyroidism

Caution should be exercised by people who have hypothyroidism, as this condition may cause a long delay in the metabolism of nitrazepam leading to significant drug accumulation.[72]

Contraindications

Nitrazepam should be avoided in patients with chronic obstructive pulmonary disease (COPD), especially during acute exacerbations of COPD, because serious respiratory depression may occur in patients receiving hypnotics.[73]

As with other hypnotic drugs, nitrazepam is associated with an increased risk of traffic accidents.[48] Nitrazepam is recommended to be avoided in patients who drive or operate machinery. A study assessing driving skills of sedative hypnotic users found the users of nitrazepam to be significantly impaired up to 17 hours after dosing, whereas users of temazepam did not show significant impairments of driving ability. These results reflect the long-acting nature of nitrazepam.[74]

Toxicity

Humans

A systematic review of the medical literature concerning insomnia medications raised concerns about benzodiazepine receptor agonist drugs, the benzodiazepines and the Z-drugs used as hypnotics in humans. The review found almost all trials of sleep disorders and drugs are sponsored by the pharmaceutical industry. The odds ratio for finding results favorable to industry in industry-sponsored trials was 3.6 times higher than non-industry-sponsored studies, and 24% of authors did not disclose being funded by the drug companies in their published papers when they were funded by the drug companies. Little research into hypnotics is independent from the drug manufacturers. Also of concern was the lack of focus in industry-sponsored trials on their own results, showing the use of hypnotics is correlated with depression. No discussion of adverse effects of benzodiazepine agonist hypnotics was discussed in the medical literature, such as significantly increased levels of infection, cancers, and increased mortality in trials of hypnotic drugs and an overemphasis on the positive effects. No hypnotic manufacturer has yet tried to refute the epidemiology data that show use of their product is correlated with increased mortality. "Major hypnotic trials [are] needed to more carefully study potential adverse effects of hypnotics such as daytime impairment, infection, cancer, and death and the resultant balance of benefits and risks."[75] Chronic use of benzodiazepines seemed to cause significant immunological disorders in a study of selected outpatients attending a psychopharmacology department.[32]

Cancer

Benzodiazepine use for more than one to six months at prescribed doses is associated with an increased risk of the development of ovarian cancer.[76] Fifteen epidemiologic studies have shown hypnotic drug use is associated with increased mortality, mainly due to increased cancer deaths in humans. The cancers included cancers of the brain, lung, bowel, breast, and bladder, and other neoplasms. Not only are benzodiazepines associated with an increased risk of cancer, but the benzodiazepine receptor agonist Z-drugs also are associated with cancer in humans in these studies. Initially, FDA reviewers did not want to approve the Z-drugs due to concerns of cancer, but ultimately changed their minds and approved the drugs despite the concerns. The data show the trial subjects receiving hypnotic drugs had an increased risk of developing cancer. The review author concluded, "the likelihood of cancer causation is sufficiently strong now that physicians and patients should be warned that hypnotics possibly place patients at higher risk for cancer."[77]

Mortality

Nitrazepam therapy, compared with other drug therapies, increases risk of death when used for intractable epilepsy in an analysis of 302 patients. The risk of death from nitrazepam therapy may be greater in younger patients (children below 3.4 years in the study) with intractable epilepsy. In older children (above 3.4 years), the tendency appears to be reversed in this study.[78] Nitrazepam may cause sudden death in children. It can cause swallowing incoordination, high-peaked esophageal peristalsis, bronchospasm, delayed cricopharyngeal relaxation, and severe respiratory distress necessitating ventilatory support in children. Nitrazepam may promote the development of parasympathetic overactivity or vagotonia, leading to potentially fatal respiratory distress in children.[79]

Liver

Nitrazepam has been associated with severe hepatic disorders, similar to other nitrobenzodiazepines. Nitrobenzodiazepines such as nitrazepam, nimetazepam, flunitrazepam, and clonazepam are more toxic to the liver than other benzodiazepines as they are metabolically activated by CYP3A4 which can result in cytotoxicity. This activation can lead to the generation of free radicals and oxidation of thiol, as well as covalent binding with endogenous macromolecules; this results, then, in oxidation of cellular components or inhibition of normal cellular function. Metabolism of a nontoxic drug to reactive metabolites has been causally connected with a variety of adverse reactions.[20]

Long-term effects

Main article: Long-term effects of benzodiazepines

Long-term use of nitrazepam carries mental and physical health risks, such as the development of cognitive deficits. These adverse effects show improvement after a period of abstinence.[30][31]

Interactions

Nitrazepam interacts with the antibiotic erythromycin which is a strong inhibitor of CYP3A4, which affects concentration peak time. This interaction is not believed to be clinically important.[80] However, anxiety, tremor, and depression have been documented in a case report following administration of nitrazepam and triazolam. Following administration of erythromycin to the patient, repetitive hallucinations and abnormal bodily sensations developed. The patient had acute pneumonia and renal failure. Coadministration of benzodiazepine drugs at therapeutic doses with erythromycin may cause serious psychotic symptoms, especially in those with other significant physical complications.[81] Oral contraceptive pills, reduce the clearance of nitrazepam which may lead to increased plasma levels of nitrazepam and accumulation.[82] Rifampin increases the clearance of nitrazepam significantly and probenecid decreases its clearance significantly.[83] Cimetidine slows down the elimination rate of nitrazepam, leading to more prolonged effects and increased risk of accumulation.[84] Alcohol in combination with nitrazepam may cause a synergistic enhancement of the hypotensive properties of both benzodiazepines and alcohol.[85] Benzodiazepines including nitrazepam may inhibit the glucuronidation of morphine, leading to increased levels of and prolongation of the effects of morphine in rat experiments.[86]

Pharmacology

Nitrazepam is a nitrobenzodiazepine.[87][88] It is a 1,4 benzodiazepine, with the chemical name 1,3-Dihydro-7-nitro-5-phenyl-2H-1,4- benzodiazepin-2-one.

It is long acting, lipophilic, and metabolised hepatically by oxidative pathways. It acts on benzodiazepine receptors in the brain which are associated with the GABA receptors, causing an enhanced binding of GABA to GABAA receptors.[89] GABA is a major inhibitory neurotransmitter in the brain, involved in inducing sleepiness, muscular relaxation, and control of anxiety and seizures, and slows down the central nervous system. The mechanism of action of nitrazepam is the same as other benzodiazepine drugs and zopiclone.[90] The anticonvulsant properties of nitrazepam and other benzodiazepines may be in part or entirely due to binding to voltage-dependent sodium channels rather than benzodiazepine receptors. Sustained repetitive firing seems to be limited by benzodiazepines effect of slowing recovery of sodium channels from inactivation in mouse spinal cord cell cultures.[91] The muscle relaxant properties of nitrazepam are produced via inhibition of polysynaptic pathways in the spinal cord of decerebrate cats.[92] It is a full agonist of the benzodiazepine receptor.[93] The endogenous opioid system may play a role in some of the pharmacological properties of nitrazepam in rats.[94] Nitrazepam causes a decrease in the cerebral contents of the amino acids glycine and alanine in the mouse brain. The decrease may be due to activation of benzodiazepine receptors.[95] At high doses decreases in histamine turnover occur as a result of nitrazepam's action at the benzodiazepine-GABA receptor complex in mouse brain.[96] Nitrazepam has demonstrated cortisol-suppressing properties in humans.[97] It is an agonist for both central benzodiazepine receptors and to the peripheral-type benzodiazepine receptors found in rat neuroblastoma cells.[98]

EEG and sleep

In sleep laboratory studies, nitrazepam decreased sleep onset latency. In psychogeriatric inpatients, it was found to be no more effective than placebo tablets in increasing total time spent asleep and to significantly impair trial subjects' abilities to move and carry out everyday activities the next day, and it should not be used as a sleep aid in psychogeriatric inpatients.[99]

The drug causes a delay in the onset, and decrease in the duration of REM sleep. Following discontinuation of the drug, REM sleep rebound has been reported in some studies.[100] Nitrazepam is reported to significantly affect stages of sleep - a decrease in stage 1, 3, and 4 sleep and an increase in stage 2.[101] In young volunteers, the pharmacological properties of nitrazepam were found to produce sedation and impaired psychomotor performance and standing steadiness. EEG tests showed decreased alpha activity and increased the beta activity, according to blood plasma levels of nitrazepam.[102] Performance was significantly impaired 13 hours after dosing with nitrazepam, as were decision-making skills. EEG tests show more drowsiness and light sleep 18 hours after nitrazepam intake, more so than amylobarbitone. Fast activity was recorded via EEG 18 hours after nitrazepam dosing.[103] An animal study demonstrated that nitrazepam induces a drowsy pattern of spontaneous EEG including high-voltage slow waves and spindle bursts increase in the cortex and amygdala, while the hippocampal theta rhythm is desynchronized. Also low-voltage fast waves occur particularly in the cortical EEG. The EEG arousal response to auditory stimulation and to electric stimulation of the mesencephalic reticular formation, posterior hypothalamus and centromedian thalamus is significantly suppressed. The photic driving response elicited by a flash light in the visual cortex is also suppressed by nitrazepam. Estazolam was found to be more potent however.[104] Nitrazepam increases the slow wave light sleep (SWLS) in a dose-dependent manner whilst suppressing deep sleep stages. Less time is spent in stages 3 and 4 which are the deep sleep stages, when benzodiazepines such as nitrazepam are used. Benzodiazepines are therefore not good hypnotics in the treatment of insomnia. The suppression of deep sleep stages by benzodiazepines may be especially problematic to the elderly as they naturally spend less time in the deep sleep stage.[105]

Pharmacokinetics

Nitrazepam is largely bound to plasma proteins.[106] Benzodiazepines such as nitrazepam are lipid-soluble and have a high cerebral uptake.[107] The time for nitrazepam to reach peak plasma concentrations following oral administration is about 2 hours (0.5 to 5 hours). The half-life of nitrazepam is between 16.5 to 48.3 hours. In young people, nitrazepam has a half-life of about 29 hours and a much longer half-life of 40 hours in the elderly.[50][51] Both low dose (5 mg) and high dose (10 mg) of nitrazepam significantly increases growth hormone levels in humans.[108]

Nitrazepam's half-life in the cerebrospinal fluid, 68 hours, indicates that nitrazepam is eliminated extremely slowly from the cerebrospinal fluid.[109] Concomitant food intake has no influence on the rate of absorption of nitrazepam nor on its bioavailability. Therefore, nitrazepam can be taken with or without food.[110]

Abuse potential

See also: Benzodiazepine drug misuse

Recreational use of nitrazepam is common.[111] A study conducted in the UK in 1997 found that nitrazepam was the most common benzodiazepine in the urine of drug addiction inpatients.[57] However, it has been superseded by temazepam, despite the fact that temazepam is much more highly regulated in the UK.[56] Research conducted in 1996 found that nitrazepam is commonly abused in India.[58]

Nitrazepam in animal studies has been shown to increase reward seeking which may suggest increased risk of addictive behavioural patterns in rats.[112] A study found that nitrazepam caused significant euphoria as against placebos and was identified as an active drug by freshly detoxified experienced drug abusers of heroin and other drugs. Nitrazepam resembled diazepam (Valium), however, on certain parameters the effects produced by nitrazepam were more pronounced in these drug abusers. Nitrazepam was found to be an abusable drug and has similar abuse liability like diazepam, if not slightly higher in these drug abusers. Nitrazepam in drug abusers produces effects including feeling energetic, relaxed, drunken, talkative, pleasure and euphoria. In India up to 50-60% of heroin addicts abuse benzodiazepines and 20% of injecting substance misusers also inject benzodiazepines.[113]

Treatment with nitrazepam should usually not exceed seven to ten consecutive days. Use for more than two to three consecutive weeks requires complete re-evaluation of the patient. Prescriptions for nitrazepam should be written for short-term use (seven to ten days) and it should not be prescribed in quantities exceeding a one-month supply. Dependence can occur in as little as four weeks.[114]

Benzodiazepines such as nitrazepam account for 52% of forged drug prescriptions in Sweden, more than any other drug class.[115] In Bangladesh, benzodiazepines are often used to commit drug-facilitated crimes such as robbery.[116]

Nitrazepam and other benzodiazepines are detected frequently in cases of people suspected of driving under the influence of drugs in Sweden. Other benzodiazepines and zolpidem and zopiclone are also found in high numbers in suspected impaired drivers. Many drivers have blood levels far exceeding the therapeutic dose range suggesting a high degree of abuse potential for benzodiazepines and zolpidem and zopiclone.[117] In Northern Ireland in cases where drugs were found in tests on impaired drivers, benzodiazepines were found to be present in 87% of cases.[118][119] In Norway benzodiazepines are the most commonly detected illicit drug in suspected drugged drivers being detected in 38-57% of those drivers.[120]

Overdose

Nitrazepam overdose may result in stereotypical symptoms of benzodiazepine overdose including intoxication, impaired balance and slurred speech. In cases of severe overdose this may progress to a comatose state with the possibility of death. The risk of nitrazepam overdose is increased significantly if nitrazepam is abused in conjunction with opioids, as was highlighted in a review of deaths of users of the opioid buprenorphine.[121] Nitrobenzodiazepines such as nitrazepam can result in a severe neurological effects.[122] Nitrazepam taken in overdose is associated with a high level of congenital abnormalities (30 percent of births). Most of the congentital abnormalities were mild deformities.[55]

Severe nitrazepam overdose resulting in coma causes the central somatosensory conduction time (CCT) after median nerve stimulation to be prolonged and the N20 to be dispersed. Brain-stem auditory evoked potentials demonstrate delayed interpeak latencies (IPLs) I-III, III-V and I-V. Toxic overdoses therefore of nitrazepam cause prolonged CCT and IPLs. An alpha pattern coma can be a feature of nitrazepam overdose with alpha patterns being most prominent in the frontal and central regions of the brain.[123][124]

Benzodiazepines were implicated in 39% of suicides by drug poisoning in Sweden, with nitrazepam and flunitrazepam accounting for 90% of benzodiazepine implicated suicides, in the elderly over a period of 2 decades. In three quarters of cases death was due to drowning, typically in the bath. Benzodiazepines were the predominant drug class in suicides in this review of Swedish death certificates. In 72% of the cases benzodiazepines were the only drug consumed. Benzodiazepines and in particular nitrazepam and flunitrazepam should therefore be prescribed with caution in the elderly.[54] In a brain sample of a fatal nitrazepam poisoning high concentrations of nitrazepam and its metabolite were found in the brain of the deceased person.[125]

In a retrospective study of deaths, when benzodiazepines were implicated in the deaths, the benzodiazepines nitrazepam and flunitrazepam were the most common benzodiazepines involved. Benzodiazepines were a factor in all deaths related to drug addiction in this study of causes of deaths. Nitrazepam and flunitrazepam were significantly more commonly implicated in suicide related deaths than natural deaths. In four of the cases benzodiazepines alone were the only cause of death.[52] In Australia, nitrazepam and temazepam were the benzodiazepines most commonly detected in overdose drug related deaths. In a third of cases benzodiazepines were the sole cause of death.[53]

Individuals with chronic illnesses are much more vulnerable to lethal overdose with nitrazepam, as fatal overdoses can occur at relatively low doses in these individuals.[126]

Synthesis

Reaction of 2-amino-5-nitrobenzophenone (1) with bromoacetyl bromide forms the amide 2. Ring closure in liquid ammonia affords nitrazepam (3). More simply, diazepinone (4) can be nitrated directly at the more reactive C7 position with potassium nitrate in sulfuric acid.

Nitrazepam synthesis:[127] O. Keller et al., U.S. patent 3,121,076 (1964 to Hoffmann-La Roche).

See also

References

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