Drinking montelukast does not defecate may be caused by drug factors, may also be functional constipation, hemorrhoids and other factors caused by the former caused by the discontinuation of medication can be restored, the latter caused by the need for targeted treatment under the guidance of a doctor, such as general treatment, medication and so on. 1. drug factors: some patients may take montelukast after a slight constipation of adverse reactions, stopping the drug can generally be restored. 2. Functional constipation: Drinking more water, proper exercise, and increasing the intake of fresh vegetables and fruits can help relieve constipation; if the above methods fail to relieve the constipation, the patient can be treated with medication such as polyethylene glycol electrolyte powder and Keselen. 3. Hemorrhoids: with constipation can use lactulose and other laxatives treatment, with pain can use ibuprofen pain, local injection of sclerosing agent such as 5% cod liver oil sodium and other drug treatment, but also consider surgical treatment. Drinking montelukast does not defecate, there are other reasons to exclude the drug factor and after lifestyle interventions can not be relieved it is recommended to go to the hospital.