What is cost of cheap seroquel without dr prescription?Seroquel is used to treat schizophrenia in adults and children who are at least 13 years old.Seroquel is also used together with antidepressant medications to treat major depressive disorder in adults.Seroquel may also be used for purposes not listed in this medication guide.Important informationStop using Seroquel and call your doctor at once if you have the following symptoms: very stiff (rigid) muscles, high fever, sweating, confusion, fast or uneven heartbeats.