Shouldnt 51g. of miralax (polyethylene glycol) be enough to make you have a bm if your constipated? if no results should i take more or be seen for blockage

Try and see: Constipation is very common; most women suffer from it. Some medications can make it worse. Try to prevent it by increasing your fiber intake (preferable trough food as fruit, veggies, brown rice, no pizza/bread) and drinking plenty of fluids (most women don't) MiraLAX (polyethylene glycol) works, if not try senna with colace, milk of magnesia. If these don't do the trick see your doctor. You may need a colonoscopy.