Background: Antidepressants (AD) need to be chronically administered (weeks to months) to provide beneficial effects. Evidence suggests that combined administration of inhibitors of monoamine reuptake and phosphodiesterase type 4 allows a highly effective therapeutic action. Also, this coadministration more rapidly boosts the cyclic adenosine monophosphate (cAMP) pathway, which is normally activated during chronic treatment of single compounds.
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