For wiping, I recommend wet wipes and a mirror, and possibly a few months of you explicitly teaching him *how* to wipe -- make sure he masters reaching back, proper wiping depth, checking the paper to determine when done, etc.
Has he had a lot of constipation, either before or since starting the meds? Intuniv at too high a dose caused terrible constipation for my son.
His doctors recommended Miralax daily to manage it, but ultimately we took him down to a lower dose and that cleared it up.
Sometime severe constipation can cause stool to "leak" suddenly around a blockage:
Quote:
Encopresis, also called stool holding or soiling, occurs when your child resists having bowel movements, causing impacted stool to collect in the colon and rectum. When your child's colon is full of impacted stool, liquid stool can leak around the impacted stool and out of the anus, staining your child's underwear.
Here's a pretty good page about it, with some links about treatment and prevention:
http://www.mayoclinic.org/diseases-conditions/encopresis/basics/definition/con-20029758