Question: how long does it take to have a bowel movement after gastric bypass?
Answer: If you still do not have a bowel movement 5 days after surgery, take 30 millilitres of Milk of Magnesia once a day. 4. If have taken Milk of Magnesia and still have no bowel movement in 24 hours, you may need a glycerine suppository. You should only take the suppository once.