i dont know what kind of meds your grandchild is on, but my son Sam had a pretty big bout of constipation in December of 2002. He is 4. He had recently been increased from 4 creon 5 pills a day to 5 creon 5 pills a day and from 1 prilosec a day to 2 prilosecs a day. After three days of the new medicinal levels, he suffered acute abdominal pain and discomfort. The Cf clinic increased his meds and when i told them i thought the new change to his medical habits had something to do with it, along with the advice of my pediatrician, they relented and changed his levels back. But the problem still remained for three weeks. Hard to believe that a small change in meds had such painful ramifications for my son. one visit to the er and two visits to the doctor to check for fecal compaction and lots of enemas later, Sam is doing fine now. The cf clinic did put him on Lactulose 1 tsp twice a day when he appears to be impacted. He was born with intestinal obstruction known as meconium ilieus, so i was worried and rightly so about intestinal obstruction.ask about lactulose and also enzyme intake. i hope this helps...email me and let me knowwoodnymph@alltel.net