Schizophrenia drug molecule. Computer model of a molecule of the schizophrenia drug quetiapine. Atoms are represented as spheres and are colour- coded: carbon (light blue), hydrogen (white), oxygen (red), nitrogen (dark blue) and sulphur (yellow). Quetiapine, which is marketed under the name seroquel, is an atypical antipsychotic drug used to treat schizophrenia. It works by blocking receptors in the brain for the neurotransmitters dopamine and serotonin, the overactivity of which is associated with schizophrenia. Quetiapine may also be used to treat bipolar disorder, anxiety and insomnia.