The generic name of the drug Derexin is Haloperidol Melitrexed, and it is usually taken for six months to more than a year to be tapered off. If fluperthiazide melitrexate is used as an antidepressant and anti-anxiety medication to treat depression and anxiety, it needs to be taken for at least six months, if not more than a year, and then the dosage is gradually reduced until it is stopped. The discontinuation process varies from person to person. The fast ones can be completed within two weeks and the slow ones can last for months or even more than a year. Taking Haloperidol Melittrexin should not be stopped abruptly, it must be stopped gradually, and the medication can be reduced every 2 to 4 weeks with the advice of a doctor by 1/2 to 1/4 tablet each time, taking 2 to 3 months or even longer to reduce the medication, which not only prevents withdrawal syndrome, but also reduces the recurrence of depression. In the early stages of haloperidol melitrexate taper, symptoms such as physical fatigue, decreased sleep quality, and neurasthenia can occur. Patients are advised to relax and avoid excessive anxiety and impatience during the period of administration and discontinuation of the drug. Such drugs need to be used under the guidance of a doctor, and should not be used without authorization.