"It was horrifying to see my daughter change like that and to not completely go back to normal," Ward told WPVI.
Jessica Aman of Chester Springs, Pennsylvania, echoed the sentiment, telling WPVI that her son "was absolutely robbed of most of his childhood."
Although the study is still underway, the FDA told WPVI that there isn't enough data "to demonstrate a link between PEG 3350 and serious neuropsychiatric issues in children."
In a 2015 article on Parents.com, Dr. Steve J. Hodges, an associate professor of pediatric urology at the Wake Forest School of Medicine, pointed out that "more than 100 studies have found PEG 3350 is safe to use in children."
"I have found no published studies linking MiraLAX to severe or harmful side-effects," said Hodges, who was responding to a New York Times article about the Philadelphia study.