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The success of gradual-tapering benzodiazepines is as great in the elderly as in younger people. Benzodiazepines should be prescribed to the elderly only with caution and only for a short period at low doses. [94] [95] Short to intermediate-acting benzodiazepines are preferred in the elderly such as oxazepam and temazepam.
In the elderly, long-term benzodiazepine therapy is a risk factor for amplifying cognitive decline, [29] although gradual withdrawal is associated with improved cognitive status. [30] A study of alprazolam found that 8 weeks administration of alprazolam resulted in deficits that were detectable after several weeks but not after 3.5 years. [31]
Oxazepam is an intermediate-acting benzodiazepine with a slow onset of action, [14] so it is usually prescribed to individuals who have trouble staying asleep, rather than falling asleep. It is commonly prescribed for anxiety disorders with associated tension, irritability, and agitation.
A clinical trial in elderly people dependent on benzodiazepine hypnotics showed that the addition of CBT to a gradual benzodiazepine reduction program increased the success rate of discontinuing benzodiazepine hypnotic drugs from 38% to 77% and at the 12-month follow-up from 24% to 70%.
Onset of action: Intermediate to slow Plasma half life: 14 hr for parent drug and 30-100 hr for its metabolite Peak plasma levels: 1-3 hr for parent drug and 3-6 hf for its metabolite Metabolism: Metabolized into desmethyldiazepam and 3-hydroxyhalazepam (in the liver) Excretion: Excreted through kidneys Protein binding: 98% bound to plasma protein
Chlordiazepoxide is generally considered an inappropriate benzodiazepine for the elderly due to its long elimination half-life and the risks of accumulation. [10] Benzodiazepines require special precaution if used in the elderly, pregnancy, children, alcohol- or drug-dependent individuals and individuals with comorbid psychiatric disorders. [11]
Different benzodiazepines have different abuse potential; the more rapid the increase in the plasma level following ingestion, the greater the intoxicating effect and the more open to abuse the drug becomes. The speed of onset of action of a particular benzodiazepine correlates well with the 'popularity' of that drug for abuse.
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.