Hi, I Have Had Constipation Problems For Many Years. My

Hi, I have had constipation problems for many years. My body has not been generating BM naturally since I had my first child. I could go for 2 weeks without BM. I do drink a lot of water daily. I have been taking probiotics, dietary fibers, and eating prunes lately on a daily basis to try to ease the problem. But the method does not seem to work, either. Quite desperate, I want to try to take one pill of Dulcolax laxatives on a weekly basis. Would it be harmful to my body?