Quetiapine is primarily used in the treatment of psychiatric conditions. It is commonly prescribed to manage symptoms of schizophrenia, helping to reduce hallucinations, delusions, and disordered thinking. Additionally, it is effective in treating bipolar disorder, where it stabilizes mood swings and prevents episodes of mania or depression. Quetiapine is also utilized as an adjunct therapy in major depressive disorder, particularly when standard antidepressants alone are insufficient. Its sedative properties make it useful for addressing insomnia in certain patients, though this is an off-label use. The medication works by modulating neurotransmitter activity in the brain, particularly dopamine and serotonin, to achieve its therapeutic effects. It is available in both immediate-release and extended-release formulations, allowing for tailored treatment plans based on individual patient needs.