A number of studies have reported decreased human lumbar cerebrospinal fluid (CSF) concentrations of the major serotonin metabolite, 5-hydroxyindoleacetic acid (5-HIAA), following chronic administration of selective serotonin reuptake inhibitors (SSRIs). This decrease has been thought to be a consequence of elevated extracellular serotonin and to be mediated through terminal autoreceptor feedback inhibition of serotonin turnover. We wished to study the previously unexamined acute effects of SSRI administration on human CSF 5-HIAA. A serial lumbar puncture (LP) procedure was used to collect CSF samples before and after a single oral 40 mg dose of the SSRI paroxetine (PAR) or matching placebo in eight healthy adult humans in a randomized, double-blind fashion. CSF 5-HIAA concentrations did not change following placebo, but showed a statistically significant 27% mean increase 3 h following PAR. Our findings stand in contrast to the decreases reported for CSF 5-HIAA after chronic SSRI treatment in humans and the decreases seen in brain extracellular 5-HIAA after acute or chronic administration of SSRIs to animals.
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