Noun
atypical antipsychotic (plural atypical antipsychotics)
(pharmacology) Any of a group of antipsychotic drugs largely introduced after the 1970s and used to treat mental disorders.
Atypical antipsychotic drugs have a similar blocking effect on D 2 receptors, however, most also act on serotonin receptors, especially 5-HT 2A and 5-HT 2C receptors. Source: Internet