Common Dehydration, Urticaria, Abdominal cramp, Nausea, Diarrhoea, Abdominal bloating.

Expert advice for Pegred Powder for Oral Solution
Avoid taking a Pegred for more than 1 week, unless prescribed by the doctor, as it leads to dependency on the laxative action to produce a bowel movement.  Together with Pegred, fiber rich diet containing whole grain bread and cereals, bran, fruits and green leafy vegetables, is essential to maintain healthy bowel function. A Pegred should preferably be taken at bedtime because it requires 6 to 8 hours to show impact. Notify your doctor if you are on a low-sugar diet because the Pegred contains sugars. Take Pegred after 2 hours from other medicines, as it may interfere with the absorption of other medicines.

Q. Is polyethylene glycol safe?
Polyethylene glycol is safe if used at prescribed doses for the prescribed duration as advised by your doctor

Q. Is polyethylene glycol the same as Miralax?
Yes. Miralax is the brand name of polyethylene glycol.