Easy-to-read patient leaflet for Quetiapine Tablets. Includes indications, proper use, special instructions, precautions, and possible side effects. Seroquel and Seroquel XR (quetiapine) is an antipsychotic drug used to treat bipolar disorder and schizophrenia. Common side effects include agitation, headache, and upset stomach. Serious side effects include suicidal thoughts, prolonged erection, and stroke. Pregnancy and breastfeeding safety information is provided. Seroquel is the brand name of the generic drug quetiapine, used to treat schizophrenia and bipolar disorder (formerly known as manic-depression). Side effects Relatively common side effects that accompany quetiapine include drowsiness, dizziness, rash, dry mouth, insomnia , fatigue , muscular weakness, anorexia, blurred vision, some loss of muscular control, and amenorrhea (lack of menstruation) in women. Find a comprehensive guide to possible side effects including common and rare side effects when taking Seroquel (Quetiapine Fumarate) for healthcare professionals and consumers. Find a comprehensive guide to possible side effects including common and rare side effects when taking Seroquel XR (Quetiapine Fumarate Extended-Release Tablets) for healthcare professionals and consumers. Find patient medical information for Quetiapine Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Quetiapine oral tablet may cause drowsiness. It can also cause other side effects. More common side effects. The side effects for this drug vary slightly based on the drug form. Clinical trials with quetiapine did not indicate a difference in tolerability in the geriatric patient vs. younger adult patients. Elderly patients may be more sensitive to the sedative, anticholinergic, and orthostatic effects of quetiapine; consider a slower rate of dose titration and lower target dose in the older adult. Quetiapine is an antipsychotic medicine. It works by changing the actions of chemicals in the brain. Quetiapine is used to treat schizophrenia in adults and children who are at least 13 years old.