The efficacy and safety of drug treatments for chronic insomnia in adults: a meta-analysis of RCTs.
BACKGROUND
Hypnotics have a role in the management of acute insomnia; however, the efficacy and safety of pharmacological interventions in the management of chronic insomnia is unclear.


OBJECTIVE
The objective of this paper is to conduct a systematic review of the efficacy and safety of drug treatments for chronic insomnia in adults.


METHODS
Twenty-one electronic databases were searched, up to July 2006.


METHODS
Randomized double-blind, placebo-controlled trials were eligible. Quality was assessed using the Jadad scale. Data were pooled using the random effects model.


RESULTS
One hundred and five studies were included in the review. Sleep onset latency, as measured by polysomnography, was significantly decreased for benzodiazepines (BDZ), (weighted mean difference: -10.0 minutes; 95% CI: -16.6, -3.4), non-benzodiazepines (non-BDZ) (-12.8 minutes; 95% CI: -16.9, -8.8) and antidepressants (ADP) (-7.0 minutes; 95% CI: -10.7, -3.3). Sleep onset latency assessed by sleep diaries was also improved (BDZ: -19.6 minutes; 95% CI: -23.9, -15.3; non-BDZ: -17.0 minutes; 95% CI: -20.0, -14.0; ADP: -12.2 minutes; 95% CI: -22.3, -2.2). Indirect comparisons between drug categories suggest BDZ and non-BDZ have a similar effect. All drug groups had a statistically significant higher risk of harm compared to placebo (BDZ: risk difference [RD]: 0.15; non-BDZ RD: 0.07; and ADP RD: 0.09), although the most commonly reported adverse events were minor. Indirect comparisons suggest that non-BDZ are safer than BDZ.


CONCLUSIONS
Benzodiazepines and non-benzodiazepines are effective treatments in the management of chronic insomnia, although they pose a risk of harm. There is also some evidence that antidepressants are effective and that they pose a risk of harm.
Buscemi
Nina
N
University of Alberta/Capital Health Evidence-Based Practice Centre, Department of Pediatrics, University of Alberta, Alberta, Canada.
Vandermeer
Ben
B
Friesen
Carol
C
Bialy
Liza
L
Tubman
Michelle
M
Ospina
Maria
M
Klassen
Terry P
TP
Witmans
Manisha
M
D000328:Adult; D000368:Aged; D000928:Antidepressive Agents / Q000009:adverse effects / Q000627:therapeutic use; D001569:Benzodiazepines / Q000009:adverse effects / Q000627:therapeutic use; D005260:Female; D006801:Humans; D006993:Hypnotics and Sedatives / Q000009:adverse effects / Q000627:therapeutic use; D008297:Male; D008875:Middle Aged; D017286:Polysomnography / Q000379:methods; D016032:Randomized Controlled Trials as Topic / Q000379:methods; D007319:Sleep Initiation and Maintenance Disorders / Q000188:drug therapy* / Q000453:epidemiology / Q000503:physiopathology
D000928:Antidepressive Agents; D006993:Hypnotics and Sedatives; D001569:Benzodiazepines