Benzodiazepines: A Versatile Clinical Tool; Evidence Supports Their Use for Alcohol Withdrawal, Insomnia, Anxiety Disorders, and Other Conditions
Current Psychiatry, Apr 1, 2012
Since the discovery of chlordiazepoxide in the 1950s, benzodiazepines have revolutionized the tre... more Since the discovery of chlordiazepoxide in the 1950s, benzodiazepines have revolutionized the treatment of anxiety and insomnia, largely because of their improved safety profile compared with barbiturates, formerly the preferred sedative-hypnotic. (1) In addition to their anxiolytic and sedative-hypnotic effects, benzodiazepines exhibit anterograde amnesia, anticonvulsant, and muscle relaxant properties. (1) Psychiatrists use benzodiazepines to treat anxiety and sleep disorders, acute agitation, alcohol withdrawal, catatonia, and psychotropic side effects such as akathisia. This article highlights the evidence for using benzodiazepines in anxiety and other disorders and why they generally should not be used for obsessive-compulsive disorder and posttraumatic stress disorder (Box 1, page 59). Pharrnacolunetic properties Most benzodiazepines are considered to have similar efficacy; therefore, selection is based on pharmacokinetic considerations. Table 1 (page 60) compares the indica tion, onset, and half-life of 12 commonly used benzodiazepines. (2-6) Although Table 1 lists approximate equivalent doses, studies report inconsistent data. These are approximations only and should not be used independently to make therapy decisions. Table 1 Oral benzodiazepines: Indications, onset, half-life, and equivalent doses Drug FDA-approved Onset of Approximate action half-life (hours) indication(s) in healthy adults Aiprazolam Anxiety Intermediate 6.3 to 26.9 disorders, (IR), 10.7 panic to 15.8 disorder (XR) Chlordiazepoxide Anxiety Intermediate 24 to 48 disorders, acute alcohol withdrawal, preoperative apprehension and anxiety Clonazepam Seizure Intermediate 18 to 50 disorders, panic disorder Clorazepate Anxiety, Fast 40 to 50 seizures, acute alcohol withdrawal Diazepam Anxiety Very fast 20 to 100 disorders, acute alcohol withdrawal, muscle spasms, convulsive disorders Estazolam Insomnia Intermediate 10 to 24 Flurazepam Insomnia Intermediate 47 to 100 Lorazepam Anxiety intermediate 10 to 20 Oxazepam Anxiety, acute Slow to 5 to 20 alcohol intermediate withdrawal Quazepam Insomnia Intermediate 39 to 73 Temazepam Insomnia Intermediate 3.5 to 18.4 Triazolam Insomnia Fast 1.5 to 5.5 Drug Approximate Comments equivalent dose (mg) (a) Aiprazolam 0.5 Increased risk for abuse because of greater lipid solubility Chlordiazepoxide 10 Risk for accumulation because of long-acting metabolites (desmethyldiazepam, oxazepam) Clonazepam 0.25 to 0.5 Use caution in patients with liver disease Clorazepate 7.5 Risk for accumulation because of long-acting metabolites (desmethyldiazepam, oxazepam) Diazepam 5 Risk for accumulation because of long-acting metabolites (temazepam, desmethyldiazepam, oxazepam). …
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