A review of key placebo-controlled studies of benzodiazepines and sele
ctive serotonin reuptake inhibitors (SSRIs) over the past decade chall
enges the widespread view that placebo response rates resulting from c
linical trials of pharmacotherapy for panic disorder are excessively h
igh. Statistically and clinically significant drug-placebo differences
have been demonstrated in large-scale trials. Further research is nee
ded on the impact of pharmacological treatments on the medium- and lon
g-term course of the disorder.