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The onset of action is one to five minutes for IV administration and 15–30 minutes for IM administration. The duration of diazepam's peak pharmacological effects is 15 minutes to one hour for both routes of administration. [68] The half-life of diazepam, in general, is 30–56 hours. [1]
The first benzodiazepine, chlordiazepoxide (Librium), was discovered accidentally by Leo Sternbach in 1955, and was made available in 1960 by Hoffmann–La Roche, which followed with the development of diazepam (Valium) three years later, in 1963. [1]
Approx. Equivalent Oral Dose to 10 mg Diazepam [b] (mg) Peak Onset of Action (hours) Elimination Half-life of Active Metabolite (hours) Primary Therapeutic Use Adinazolam: Deracyn: Research chemical: 1–2: 3: anxiolytic, antidepressant: Alprazolam
A short elimination half-life and a rapid onset of action are characteristics which increase the abuse potential of a benzodiazepines. [18] The following table provides the elimination half-life, approximate equivalent doses, speed of onset of action, and duration of behavioural effects. [32] [33]
Following chlordiazepoxide, in 1963 diazepam hit the market under the brand name Valium—and was followed by many further benzodiazepine compounds over the subsequent years and decades. [35] In 1959 it was used by over 2,000 physicians and more than 20,000 patients.
Onset of action: 1.5–4 hours: Elimination ... in children, alcohol or drug ... tablets 0.5 and 1 mg, solution for intramuscular and intravenous injection 1 mg/mL (0 ...
An Australian study (2004) of overdose admissions between 1987 and 2002 found alprazolam, which happens to be the most prescribed benzodiazepine in Australia and the United States, to be more toxic than diazepam and the other three benzodiazepines which it was compared to (alprazolam, diazepam, oxazepam, chlordiazepoxide, and clonazepam).
Effects of long-term benzodiazepine use may include disinhibition, impaired concentration and memory, depression, [19] [20] as well as sexual dysfunction. [6] [21] The long-term effects of benzodiazepines may differ from the adverse effects seen after acute administration of benzodiazepines. [22]