Dosing Quetiapine for Bipolar Disorder

Initial Dosing Strategy

The American Academy of Child and Adolescent Psychiatry recommends quetiapine as monotherapy for both acute mania and bipolar depression in adults who cannot tolerate traditional mood stabilizers, with a dosing protocol starting at 50 mg on day 1, titrating to 300 mg/day by day 4, and maintaining at 300 mg once daily at bedtime 1
For bipolar depression, the initial dose is 50 mg once daily at bedtime, increased to 100 mg once daily on day 2, 200 mg once daily on day 3, and a target dose of 300 mg once daily at bedtime on day 4 onward 2
For acute mania or agitation, the initial dose is 12.5 mg twice daily, with gradual titration as tolerated, and a maximum dose of 200 mg twice daily 2, 3, 4, 5, 6

For older or frail patients, the starting dose should be reduced to 25 mg once daily and titrated more slowly, due to increased sensitivity to sedation and orthostatic hypotension 3, 4, 5, 6
For patients with hepatic impairment, the dose should be reduced, as recommended by the Annals of Oncology 3, 4, 5, 6

Orthostatic hypotension should be monitored, particularly during the titration phase, as recommended by the American Family Physician and Annals of Oncology 2, 3, 4, 5, 6
Fasting glucose should be monitored, as recommended by the American Family Physician 2
Quetiapine can prolong the QT interval, and a baseline ECG should be considered in patients with cardiac risk factors, as recommended by the European Heart Journal 7

The Annals of Oncology recommends assessing for contraindications, such as severe hepatic impairment and cardiac conduction abnormalities, before starting quetiapine 5
The starting dose for quetiapine is 50 mg at bedtime, or 25 mg if the patient is elderly or frail, as recommended by the Annals of Oncology 3, 5