PNU-181731 is a drug which acts as an agonist at serotonin 5-HT2 receptors with strongest binding affinity for the 5-HT2C subtype at 4.8nM and weaker 5-HT2A affinity of 18nM. It has anxiolytic effects in animal studies with around one tenth the potency of alprazolam and no significant ataxia or other side effects noted.
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