S 32212 is an inverse agonist of the serotonin (5-HT) receptor subtypes 5-HT2CINI and 5-HT2CVSV (Kis = 6.6 and 8.9 nM, respectively).1 It is also an antagonist of the 5-HT2A receptor and the α2B-adrenergic receptor (Ki = 5.8 nM for both). S 32212 is greater than 70-fold selective for these receptors in a panel of 80 receptors, enzymes, and ion channels. S 32212 reduces binding of GTPɣS to Gαq and decreases the activity of phospholipase C (PLC) in HEK293 cells expressing 5-HT2CINI receptors (EC50s = 38 and 18.6 nM, respectively) and in CHO cells expressing 5-HT2CVSV receptors (EC50s = 38 and 18.6 nM, respectively). S 32212 (2.5 mg/kg) decreases head twitching, penile erections, and drug discrimination induced by 5-HT receptor agonists in mice and rats. It reduces immobility time in the forced swim test and decreases marble burying in mice and rats when administered at doses of 10 and 40 mg/kg, indicating anti-depressant-like and anxiolytic activities.1,2WARNING This product is not for human or veterinary use.