Not sure what prep she has to take. My daughter takes the Fleet Phospho-soda. Last year, the first time she was very sick. She did OK but the 2nd time she had to drink (in the afternoon) she really had a tough time and threw most of it back up. She also drank it with lemon-lime gatorade (which she used to like) but since then hasn't been able to enjoy the gatorade!
This time (about 3 weeks ago) she used the same gatorade again (why ruin another drink for life!). We made sure the gatorade and the prep were cold in the refrigerator. She drank from a straw. She didn't stop until she was done. A bit nauseous but she didn't throw up. Lots of controlled breathing to get her through. She also ate less a day or two before the prep. Less to come out!
The doctor would like to do another colonoscopy in about 6 months, hopefully when she is feeling well so he can get a look when she is healthy. Luckily her colonoscopies are covered by our insurance.
Bratcat is not underweight or height so her prep is treated like an adults. She does go to a pediatric GI.