CAS NO.:40054-69-1 Etizolam; Etilaam, Etizola, Sedekopan, Etizest C17H15ClN4S Anxiolytics；Depressant;Calming;Glycine receptor modulators;Anticonvulsants

Detail:

        Etizolam (marketed under the brand name Etilaam, Etizola, Sedekopan, Etizest, Pasaden or Depas) is a benzodiazepine analog. The etizolam molecule differs from a benzodiazepine in that the benzene ring has been replaced by a thiophene ring and triazole ring has been fused, making the drug a thienotriazolodiazepine. It possesses amnesic, anxiolytic, anticonvulsant, hypnotic, sedative and skeletal muscle relaxant properties.

Indications:

        Short-term treatment of insomnia

        Short-term treatment of anxiety or panic attacks, if a benzodiazepine is required

Side effects:

        Blepharospasms with long-term use

Very Rare:

        Erythema annulare centrifugum skin lesions

Tolerance, dependence and withdrawal:

        Abrupt or rapid discontinuation from etizolam, as with benzodiazepines, may result in the appearance of the benzodiazepine withdrawal syndrome, including rebound insomnia. Neuroleptic malignant syndrome, a rare event in benzodiazepine withdrawal, has been documented in a case of abrupt withdrawal from etizolam. This is particularly relevant given etizolam's short half life relative to benzodiazepines such as diazepam resulting in a more rapid drug level decrease in blood plasma levels.

        In a study that compared the effectiveness of etizolam, alprazolam, and bromazepam for the treatment of generalized anxiety disorder, all three drugs retained their effectiveness over 2 weeks, but etizolam became more effective from 2 weeks to 4 weeks, a type of reverse tolerance. Administering .5 mg etizolam twice daily did not induce cognitive deficits over 3 weeks when compared to placebo.

        When multiple doses of etizolam, or lorazepam, were administered to rat neurons, lorazepam caused downregulation of alpha-1 benzodiazepine binding sites (tolerance/dependence), while etizolam caused an increase in alpha-2 benzodiazepine binding sites (reverse tolerance to anti-anxiety effects). Tolerance to the anticonvulsant effects of lorazepam was observed, but no significant tolerance to the anticonvulsant effects of etizolam was observed. Etizolam therefore has a reduced liability to induce tolerance, and dependence, compared with classic benzodiazepines.

Pharmacology:

        Etizolam, a thienodiazepine derivative, is absorbed fairly rapidly, with peak plasma levels achieved between 30 minutes and 2 hours. It has a mean elimination half life of about 3.5 hours. Etizolam possesses potent hypnotic properties, and is comparable with other short-acting benzodiazepines. Etizolam acts as a full agonist at the benzodiazepine receptor to produce its range of therapeutic and adverse effects.

        According to the Italian P.I. sheet, etizolam belongs to a new class of diazepines, thienotriazolodiazepines. This new class is easily oxidized, rapidly metabolized, and has a lower risk of accumulation, even after prolonged treatment. Etizolam has an anxiolytic action about 6 times greater than that of diazepam. Etizolam produces, especially at higher dosages, a reduction in time taken to fall asleep, an increase in total sleep time, and a reduction in the number of awakenings. During tests, there were no substantial changes in deep sleep; however, it may reduce REM sleep. In EEG tests of healthy volunteers, etizolam showed some similar characteristics to tricyclic antidepressants.

Interactions:

        Itraconazole and fluvoxamine slow down the rate of elimination of etizolam, leading to accumulation of etizolam, therefore increasing its pharmacological effects. Carbamazepine speeds up the metabolism of etizolam, resulting in reduced pharmacological effects.

Overdose:

        Cases of intentional suicide by overdose using etizolam in combination with GABA agonists have been reported. Although etizolam has a lower LD50 than certain benzodiazepines, the LD50 is still far beyond the prescribed or recommended dose. Flumazenil, a GABA antagonist agent used to reverse benzodiazepine overdoses, inhibits the effect of etizolam as well as classical benzodiazepines such as diazepam and chlordiazepoxide.

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