what is seroquel classified as
Quetiapine (/kwÉ¨ËtaÉª.ÉpiËn/ kwi-TY-É-peen) (developed and marketed as Seroquel by AstraZeneca) is an atypical antipsychotic approved for the treatment of schizophrenia, bipolar disorder, and along with an antidepressant to treat major depressive disorder.Annual sales are approximately $1.3 billion worldwide.n those with bipolar disorder, quetiapine is used to treat depressive episodes, acute manic episodes associated with bipolar I disorder (as either monotherapy or adjunct therapy to lithium, valproate or lamotrigine), and maintenance treatment of bipolar I disorder (as adjunct therapy to lithium or divalproex).