Risperidone (hydrochloride)

Risperidone hydrochloride (R 64 766 hydrochloride) 5-HT₂ receptor blocker, P-Glycoprotein inhibitor and potent dopamine D₂ receptor antagonist, with K_is of 4.8, 5.9 nM for 5-HT_2A and dopamine D₂ receptor, respectively. In Vitro: Risperidone is a serotonin 5-HT₂ receptor blocker, P-Glycoprotein inhibitor and potent dopamine D₂ receptor antagonist, with K_is of 4.8, 5.9 nM for 5-HT_2A and dopamine D₂ receptor, respectively. Risperidone dose-dependently inhibited the release of IL-12 in mature DCs, while the production of IL-10 is dose-dependently increased by Risperidone. A high dose of risperidone can induce TNF-α release from mature DCs^[3]. In Vivo: In the first experiment, body weight is found to be slightly but significantly lower in the Risperidone-treated rats as a function of age. Similar to the first experiment, age-dependent differences in body weight are also observed between the three treatment groups in the second locomotor experiment. Rats treated with the 3.0 mg/kg dose of Risperidone weigh less than vehicle-treated rats on postnatal days 35, 38, and 41. The third locomotor experiment involves larger, mixed-sex litters in contrast to the smaller, single-sex litters used in the first two experiments. As noted for the first two experiments, rats treated with Risperidone in the third experiment gain less weight in an age-dependent manner^[4].