Pharmacology General ec40934f Mechanism of action of buspirone is? A 5 HT1A paial agonism. B 5 HT1B antagonism. C 5 HT1B paial agonism. D 5 HT2C antagonism. High-Yield Explanation Ans. A. HT1A paial agonism5 HT1A:Presynaptic autoreceptor.Modulates serotonin release.Paial 5 HT1A agonists:Buspirone, isapirone, gepirone.Useful as anti-anxiety drug.