@ecclesiastian I’ll dig a bit more for better citations but the AI generated summary from my Google search is as follows:
“Miralax (PEG 3350) has been the subject of controversy for years because of a 2014 study that found 167 children taking Miralax had severe emotional or psychiatric side effects. The FDA has received reports of adverse events from 950 children after taking Miralax, including mouth ulcers, suicidal thoughts, mood swings, aggression, and seizures. Other parents have reported serious side effects, including:
Tics, Rage, Uncontrollable tics, Hitting, biting, and pinching, Anxiety, Behavior issues, and Paranoia.
The FDA has approved the use of Miralax for adults only, due to lack of clinical trials in children. However, many doctors believe Miralax is safe for children as young as 6 months.” Edit: I just remembered that there were also issues with Miralax being contaminated with something at some point, which wasn’t a high enough dose to impact adults but was really bad for kids. Allegedly this issue has been resolved.
So maybe the issue isn’t the Miralax itself but possible contamination during processing. I understand that scientifically it shouldn’t cause issues due to how it works, but if there is something in it that shouldn’t be, that would explain kids reacting badly.