I don't care what your doctors say, do not, I repeat, do not give Miralax. My daughter was on that stuff for over six years by the doctors orders. She's now almost 7. We've had problems with her since she started solid foods. She was breastfed. I was just at a loss and became a basket case when her rectum prolapsed, actually came outside of her.
In desperation, I looked for anything. I was referred to a colon hygienist. She was just great. She is located in Twin Lakes, WI. There is a procedure she does that is called a colonic. She inserts a tube just a little bit, not painful, and a little at a time puts warm water in the intestines. She stops it once in a while to allow for the waste to escape. She has also put her on probiotics which she takes twice a day now. She highly recommends applesauce at every meal as it's full of liquids and fiber.
My daughter has been going regularly now for a whole month with no medication after over 6 years of no success. I would swear by this woman. My daughter had to go to her about 4 times. This lady could not believe the mucus in her intestines, caused by the Miralax. She said the mucus is a sign that there is irritation in the bowels.
I'm sorry to go on so long, but I haven't been so excited in I don't know how long. I was beginning to think she had cancer or something. We even tested for Celiac Disease. She was always so bloated. I understand you're not the parent, but I would highly suggest you suggest to the parents taking him to a colon hygienist. She has helped many kids beginning with her own son. That's how she got into this profession. Originally she was an architect.
Good luck!