Hello, Your mom is suffering from megacolon, this means that her colon is extremely enlarged. However, we do not know what the cause is: is it related to any paralysis? or a lazy colon? or any other issue? So, first, we make sure there is no such paralysis. If you use a potent laxative like magnesium citrate, that will induce severe cramps and bowel movements. In case she has paralysis, I m afraid very unpleasant and serious complications will happen. Better give fibre supplement (e.g. psyllium) and gentle laxatives like senna; they all are better than magnesium citrate at this point. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr Albana Sejdini, General & Family Physician