HIGH dose Linzess did zero for me - took for 4 days - did not go one time. How much Miralax do you take per day. My guess is if you take enough and drink enough fluids it WILL WORK! The medication they give you when you have a colonoscopy works on the same principle - absorbs water into the gut - so you go. you cannot take too much - its an inert substance. you either did not take enough or did not drink enough fluids. you don't have to drink a ton - just have about 10 ounces when you take it - I put it in my morning tea - big coffee cup - and then drink 'normal amounts' of fluid throughout the day.