Olanzapine may also be used together with fluoxetine to treat depression that is a part of bipolar disorder, and depression in patients who received other antidepressants that did not work well. This medicine should not be used to treat behavioral problems in older adult patients who have dementia or Alzheimer's disease. Olanzapine is used in the treatment of Mania, Schizophrenia. View Olanzapine ’s uses , side-effects, drug interactions, expert advice and user FAQs only on 1mg.com. Olanzapine is a prescription medicine. Primarily, it is used for the treatment of Schizophrenia. Secondary and off-label uses of Olanzapine have also been mentioned below. The right dosage of Olanzapine depends on the age, gender, and medical history of the patient. Individual symptoms and route of administration also determines the right dosage . Detailed information has been provided in the dosage section. Apart from the aforementioned side effects, Olanzapine can also lead to other ...