Idebenone can be taken for a long time. Idebenone is a protective agent of brain cell metabolism, which protects mitochondria to promote the blood supply and oxygen supply of brain cells and enhance the use of oxygen by brain cells so as to improve the function of brain cells. Idebenone is widely used in chronic cerebral blood supply deficiency, traumatic brain injury, etc. caused by a variety of brain function damage, including memory impairment, reduced calculation power, inattention, as well as some anxiety, depression, dizziness, etc., have certain efficacy, of course, this drug must be used for a long time to have better results. In addition, the side effects of Idebenone are relatively small, generally there are mainly some allergic reactions including rash, nausea, vomiting, diarrhea, dizziness, occasionally there will be a drop in white blood cells, liver function damage, etc.. It should be noted that currently pregnant women are not recommended to take Idebenone because its effect on the fetus is still not clear and therefore pregnant women are advised not to use it.