Allosteric serotonin reuptake inhibitor is a type of selective serotonin reuptake inhibitor (SSRI). Currently only escitalopram, the S stereoisomer of the SSRI citalopram is included in this category.
In the realm of antidepressants, there exists a particular subset known as allosteric serotonin reuptake inhibitors. As of now, only escitalopram, being the S enantiomer of citalopram, is categorized under this specific group.