Quetiapine belongs to a group of medicines called antipsychotics. These medicines help with the effects of some types of mental illness such as: Schizophrenia [hallucinations (like hearing unexplained voices), strange and frightening thoughts, changes in how one acts, and feeling alone and confused]; Bipolar mania [effects on the mood and feeling very 'high' or excited, needing to sleep less than usual, more talkative and having racing thoughts or ideas, feeling more irritable than usual].
Quetiapine-TEVA may also be used in the treatment of bipolar depression. The symptoms of depression include feeling sad all the time, feeling guilty, always tired, not being able to sleep or eat.