One aspect of the present invention relates to pharmaceutical compositions containing two or more active agents that when taken together can be used to treat, e.g.,
insomnia and / or depression. The first component of the pharmaceutical composition is a
GABA receptor modulating compound. The second component of the pharmaceutical composition is a
serotonin reuptake inhibitor, a
norepinephrine reuptake inhibitor, a 5-HT2A modulator, or
dopamine reuptake inhibitor. In certain embodiments, the pharmaceutical composition comprises
eszopiclone. In a preferred embodiment, the pharmaceutical composition comprises
eszopiclone and
fluoxetine. The present invention also relates to a method of treating a sleep
abnormality, treating
insomnia, treating depression, augmenting
antidepressant therapy, eliciting a
dose-sparing effect, reducing depression relapse, improving the
efficacy of
antidepressant therapy or improving the
tolerability of
antidepressant therapy, comprising co-administering to a patient in need thereof a GABA-
receptor-modulating compound; and a SRI, NRI, 5-HT2A modulator or DRI.