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The tables below contain a sample list of benzodiazepines and benzodiazepine analogs that are commonly prescribed, with their basic pharmacological characteristics, such as half-life and equivalent doses to other benzodiazepines, also listed, along with their trade names and primary uses.
A benzodiazepine can be placed into one of three groups by its elimination half-life, or time it takes for the body to eliminate half of the dose. [189] Some benzodiazepines have long-acting active metabolites , such as diazepam and chlordiazepoxide, which are metabolised into desmethyldiazepam .
The half-life of chlordiazepoxide is from 5 to 30 hours but has an active benzodiazepine metabolite, nordiazepam, which has a half-life of 36 to 200 hours. [31] The half-life of chlordiazepoxide increases significantly in the elderly, which may result in prolonged action as well as accumulation of the drug during repeated administration.
Oxazepam is an intermediate-acting benzodiazepine of the 3-hydroxy family; it acts on benzodiazepine receptors, resulting in increased effect of GABA to the GABA A receptor which results in inhibitory effects on the central nervous system. [26] [27] The half-life of oxazepam is between 6 and 9 hours.
Nordazepam is a partial agonist at the GABA A receptor, which makes it less potent than other benzodiazepines, particularly in its amnesic and muscle-relaxing effects. [6] Its elimination half life is between 36 and 200 hours, with wide variation among individuals; factors such as age and sex are known to impact it. [2]
The unchanged drug was 96% bound to plasma proteins. The blood-level decline of the parent drug was biphasic, with the short half-life ranging from 0.4 to 0.6 hours and the terminal half-life from 3.5 to 18.4 hours (mean 8.8 hours), depending on the study population and method of determination. [62]
The elimination half-life of nitrazepam is 40 hours in the elderly and 29 hours in younger adults. [36] [37] Nitrazepam is commonly taken in overdose by drug abusers or suicidal individuals, sometimes leading to death. [38] [39] [40] Nitrazepam is teratogenic if taken in overdose during pregnancy with 30% of births showing congenital ...
Delorazepam is mainly used as an anxiolytic because of its long elimination half-life; showing superiority over the short-acting drug lorazepam. [11] In comparison with the antidepressant drugs, paroxetine and imipramine, delorazepam was found to be more effective in the short-term but after 4 weeks the antidepressants showed superior anti-anxiety effects.