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Long-acting benzodiazepines with long-acting active metabolites, such as diazepam and chlordiazepoxide, are often prescribed for benzodiazepine or alcohol withdrawal as well as for anxiety if constant dose levels are required throughout the day. Shorter-acting benzodiazepines are often preferred for insomnia due to their lesser hangover effect.
NICE review pointed out that short-acting Z-drugs were inappropriately compared in clinical trials with long-acting benzodiazepines. There have been no trials comparing short-acting Z-drugs with appropriate doses of short-acting benzodiazepines. Based on this, NICE recommended choosing the hypnotic based on cost and the patient's preference. [48]
Diazepam is a long-acting "classical" benzodiazepine. Other classical benzodiazepines include chlordiazepoxide, clonazepam, lorazepam, oxazepam, nitrazepam, temazepam, flurazepam, bromazepam, and clorazepate. [101] Diazepam has anticonvulsant properties. [102]
The risk and severity of withdrawal are increased with long-term use, use of high doses, abrupt or over-rapid reduction, among other factors. Short-acting benzodiazepines such as lorazepam are more likely to cause a more severe withdrawal syndrome compared to longer-acting benzodiazepines. [22]
Flurazepam is a long-acting benzodiazepine and is sometimes used in patients who have difficulty in maintaining sleep, though benzodiazepines with intermediate half-lives such as loprazolam, lormetazepam, and temazepam are also indicated for patients with difficulty maintaining sleep.
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.
Chlordiazepoxide is a long-acting benzodiazepine drug. 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 long-acting active metabolite nordazepam can cause extended sedative effects at high doses or with prolonged use, and may produce residual sedation upon awakening. [7] Fosazepam is of relatively low potency compared to other benzodiazepine derivatives, with a 100 mg dose of fosazepam equivalent to 10 mg of diazepam and 10 mg nitrazepam.
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