Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Miralax is a laxative used to smoothen your bowel. I think that you had a loaded colon which will be cleared with Miralax. If you have regular constipation you can take the drug at the bedtime regularly. If you don’t have the symptoms no need to take on a routine basis. Have healthy diet with finer rich foods. Hope I have answered your query. Let me know if I can assist you further.