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IC50: 0.066 μM for noradrenaline uptake; 5.1 μM for 5-HT uptake; 0.31 μM for dopamine uptake

Sibutramine HCl (BTS 54-524) is an inhibitor of the reuptake of monoamines with a pharmacological profile in rodents indicative of non-tricyclic putative antidepressant activity. BTS 54-505 is the primary amine metabolite of sibutramine.

In vitro: Simultaneous application of BTS 54-505 with 5-HT resulted in a prolongation of the recovery time from the 5-HT-mediated suppression of discharge activity. BTS 54-505 also prolonged the recovery time from a NA-mediated potentiation of firing. These effects on recovery time are attributed to the inhibition of uptake of both 5-HT and NA by BTS 54-505. The amplitude of the response to 5-HT or NA was unaffected by co-ejection of BTS 54-505 [1].

In vivo: The secondary (BTS 54-354) and primary (BTS 54-505) amine metabolites of sibutramine HCl exhibit similar in vivo pharmacological activity to the parent compound. Thus, each compound displays potent activity in acute behavioural models predictive of antidepressant effects and a comparable ability to inhibit the uptake of monoamines [2].

Clinical trial: Up to now, BTS 54-505 is still in the preclinical development stage.

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