Seroquel effective dose for depression and others?

Quetiapine (Oral Route)

The dose of this medicine will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of this medicine. If your dose is different, do not change it unless your doctor tells you to do so.

The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.

For oral dosage form (tablets):
For treatment of depression with bipolar disorder:
Adults—At first, 50 milligrams (mg) once a day at bedtime. Your doctor may adjust your dose as needed. However, the dose is usually not more than 300 mg per day.
Children—Use and dose must be determined by the doctor.

For treatment of mania with bipolar disorder:
Adults—At first, 50 milligrams (mg) 2 times a day. Your doctor may adjust your dose as needed. However, the dose is usually not more than 800 mg per day.
Children 10 to 17 years of age—At first, 25 milligrams (mg) 2 times a day. Your doctor may adjust your dose as needed. However, the dose is usually not more than 600 mg per day.
Children younger than 10 years of age—Use and dose must be determined by the doctor.

For treatment of schizophrenia:
Adults—At first, 25 milligrams (mg) 2 times a day. Your doctor may adjust your dose as needed. However, the dose is usually not more than 750 mg per day.
Children 13 to 17 years of age—At first, 25 milligrams (mg) 2 times a day. Your doctor may adjust your dose as needed. However, the dose is usually not more than 800 mg per day.
Children younger than 13 years of age—Use and dose must be determined by the doctor.

Source: Mayo Clinic

Additional information:
https://www.drugs.com/seroquel.html