Taking one tablet of olanzapine is usually effective, but the exact dosage depends on the condition. Olanzapine is a kind of antipsychotic drugs, mainly used in the treatment of schizophrenia, usually in the beginning of the drug, the starting dose will be relatively small, may take a piece of it can play a significant effect, especially for some special types of people, for example, liver, kidney function damage people, the initial dose is usually smaller. However, the patient’s condition is different, the dosage is also different, some patients with more serious conditions, or in the acute attack period, for example, manic episode, the dose tends to be more, the specific use of the drug must have a doctor’s guidance. Adverse reactions include erythrocytosis, increased appetite, weight gain, drowsiness, dizziness, dry mouth, constipation, postural hypotension and so on. Olanzapine is taken with the caution that it is contraindicated in people who are allergic to the product and the ingredients contained in it, and in patients at risk of narrow-angle glaucoma. It is not suitable for pregnant and lactating women, children under 18 years of age. It is recommended to use the drug correctly under the guidance of a specialized doctor. In case of significant adverse reactions, it is necessary to stop the drug and consult a doctor.