Seroquel is the brand name for quetiapine, an atypical antipsychotic medication primarily used to treat schizophrenia, Bipolar disorder, and major depressive disorder. It works by altering the effects of neurotransmitters in the brain, particularly serotonin and dopamine. Seroquel can help manage symptoms such as mood swings, hallucinations, and anxiety. Like all medications, it may have side effects, and its use should be monitored by a healthcare professional.