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N-demethylation of the selective serotonin reuptake inhibitor sertraline to desmethylsertraline yields a compound with 10- to 20-fold less potency at blocking serotonin (5-HT) reuptake as measured in vitro. In the present study desmethylsertraline (DMS) was examined in two in vivo models of reuptake inhibition--elevation of extracellular 5-HT in the corpus striatum as measured by microdialysis and inhibition of firing of serotonin-containing dorsal raphe neurons. Whereas sertraline (1, 3.2, and 10 mg/kg s.c.) produced a dose-dependent increase in extracellular 5-HT and a decrease in 5-HIAA in rat striatum, desmethylsertraline was without effect on either parameter. In similar fashion, desmethylsertraline had no effect on dorsal raphe cell firing at a dose (1,000 micrograms/kg i.v.) nearly 20-fold the ED50 for sertraline (52 micrograms/kg). Taken together, these data suggest that DMS does not contribute to the blockade of central 5-HT reuptake produced by sertraline in vivo and therefore would be expected to play a negligible role in its clinical activity.

Comparison of the Effects of Sertraline and Its Metabolite Desmethylsertraline on Blockade of Central 5-HT Reuptake In Vivo