There is no optimal time to drink yogurt to relieve constipation, usually within half an hour to two hours after a meal. The treatment of constipation includes medication and dietary modifications, and the specific treatment of constipation varies depending on the cause of the disease and the degree of the disease. Drinking yogurt to relieve the symptoms of constipation, the time to drink yogurt is half an hour to two hours after a meal. Because in half an hour to two hours after a meal, the pH value in the stomach is suitable for the growth of lactic acid bacteria, which can maximize gastrointestinal peristalsis, thus helping to defecate, but yogurt is a food that does not have a therapeutic effect. If the symptoms of constipation are not relieved, or accompanied by other symptoms, you should go to the hospital in a timely manner, to clarify the cause of the targeted treatment.