Can you take lactulose , milk of magnesia, and metamucil at the same time. i am asking for my 81year old mother who has been constipated for a weeku?

You should try spacing these medications out over the course of the day as you wait for results. She should also increase her dietary fiber and fluid intake. If there is no response with these meds, she should be seen by a doctor to be sure there is nothing more serious going on, especially if she is having pain. A week is long enough! Good luck to both of you!