Mirtazapine can treat poor sleep, but it only improves poor sleep triggered by depressive episodes. Mirtazapine is not a medication specifically used to treat poor sleep; it is an antidepressant that is primarily used to treat depression, such as being effective against symptoms of depression such as psychomotor inhibition, lack of pleasure, weight loss, and mood swings. This medication is only effective for poor sleep (early waking) triggered by depression and is usually not very effective for other causes of poor sleep. Mirtazapine may cause side effects such as sedation, drowsiness, dry mouth, weight gain, dizziness, fatigue, increased appetite, etc. It is forbidden to use this drug in combination with monoamine oxidase inhibitors or within 14 days of monoamine oxidase inhibitor cessation, and it is strictly prohibited for use in people who are allergic to the components or excipients of this drug. Alcohol consumption is prohibited during the use of the drug. Mirtazapine is a prescription drug, which must be used in strict compliance with the doctor’s instructions, and should be used with caution in the presence of cardiovascular disease, hepatic and renal insufficiency, epilepsy, organic brain tissue disorders, diabetes mellitus, glaucoma, enlarged prostate and other diseases. Drugs should be used in accordance with medical advice.