In Vitro: Vabicaserin displaces ¹²⁵I-(2,5-dimethoxy)phenylisopropylamine binding from human 5-HT_2C receptor sites in Chinese hamster ovary cell membranes with a K_i value of 3 nM and is >50-fold selective over a number of serotonergic, noradrenergic, and dopaminergic receptors. Binding affinity determined for the human 5-HT_2B receptor subtype using [³H]5HT is 14 nM. Vabicaserin is a potent and full agonist (EC₅₀, 8 nM; E_max, 100%) in stimulating 5-HT_2C receptor-coupled calcium mobilization and exhibits 5-HT_2A receptor antagonism and 5-HT_2B antagonist or partial agonist activity in transfected cells, depending on the level of receptor expression. Vabicaserin exhibits lower affinity at the 5-HT_2C antagonist binding site (22 nM) labeled with [³H]mesulergine. Additional binding studies indicate that Vabicaserin possesses affinity for the 5-HT_2B and 5-HT_1A receptors with K_i values of 14 and 112 nM, respectively.

In Vivo: After a single oral dose of [¹⁴C]Vabicaserin at 50, 5, and 15 mg/kg, unchanged drug represents less than 19, 20, and 35% of total plasma radioactivity at all the time points examined in mice, rats, and dogs, respectively. The carbamoyl glucuronide (CG) represents approximately 7 to 36% of plasma radioactivity in mice and 2 to 28% of plasma radioactivity in dogs but is not detected in rat plasma after the single [¹⁴C]Vabicaserin dose. However, the CG is observed in rat plasma after multiple-dose administration of Vabicaserin at higher doses, and the CG is approximately 20 times less than Vabicaserin based on steady-state AUC_0-24 values. The estimated plasma AUC_0-24 ratios of CG to the parent drug are 1.5 and 1.7 in mice and dogs after the single [¹⁴C]Vabicaserin dose, respectively. The plasma AUC_0-24 ratios for the CG to Vabicaserin at steady state with doses used for safety assessment are less for mice (0.2-0.6) and slightly higher for dogs (1.8-4.0) compared with the single dose values. The CG is detected in dog urine in similar amounts to the parent drug, although it is not detected in mouse or rat urine after the single [¹⁴C]Vabicaserin dose. Radioactivity in a 0- to 24-h bile collection from rats receiving a 5 mg/kg [¹⁴C]Vabicaserin dose accounts for 19 and 24% of the administered dose in males and females, respectively. Although the CG is not detected in urine or feces of rats after a single oral administration, it represents an average of up to 30% of biliary radioactivity in male rats and 15% in female rats. In monkeys after a single oral 25-mg/kg dose of Vabicaserin, the plasma concentrations of the CG exceeded those of Vabicaserin at all the time points (2-24 h) postdose, although the amount of CG relative to Vabicaserin decreased by 24 h postdose, with ratios of 17.5 at 2 h and 1.7 at 24 h. The CG to Vabicaserin AUC_0-24 ratio of 12:1 indicates that the CG is a major metabolite in monkeys.

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