Selective 5-HT2C inverse agonist (pKb = 9.8). Displays selectivity over other 5-HT2 subtypes (pKi values are 6.8, 7.0 and 9.0 for 5-HT2A, 5-HT2B and 5-HT2C respectively); also exhibits >100-fold selectivity over 50 other receptors, ion channels and enzymes. Displays anxiolytic activity in rat models.